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Materials Science

From Ancient Alloys to Metamaterials: The Engineering of Matter. Slides: Materials Science · Table of Contents · What Is Materials Science? · Historical Foundations · Atomic Structure & Bonding · Crystal Structures · Defects & Dislocations · Metals & Alloys · Steel: The Backbone of Civilization.

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From Ancient Alloys to Metamaterials: The Engineering of Matter Key sections include: Materials Science; Table of Contents; What Is Materials Science?; Historical Foundations; Atomic Structure & Bonding; Crystal Structures; Defects & Dislocations; Metals & Alloys; Steel: The Backbone of Civilization; Aluminum & Light Metals.

Key sections

01Materials Science
02Table of Contents
03What Is Materials Science?
04Historical Foundations
05Atomic Structure & Bonding
06Crystal Structures
07Defects & Dislocations
08Metals & Alloys
09Steel: The Backbone of Civilization
10Aluminum & Light Metals
11Ceramics
12Polymers
13Composites
14Semiconductors
15Biomaterials
16Nanomaterials
17Smart Materials
18Superconductors
19Phase Diagrams
20Mechanical Properties
21Thermal Properties
22Corrosion & Degradation
23Failure Analysis
24Characterization Techniques

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Slide 01

Materials Science

From Ancient Alloys to Metamaterials: The Engineering of Matter
A comprehensive exploration of how humanity has learned to understand, design, and manipulate the materials that build our world.
1 / 32

Slide 02

Table of Contents

Slide 03

What Is Materials Science?

Materials science is the interdisciplinary field that studies the relationship between the structure of materials at atomic or molecular scales and their macroscopic properties. It bridges physics, chemistry, and engineering to design materials for specific applications.
The Four Pillars
Structure -- arrangement of atoms, from sub-angstrom to macroscale
Properties -- mechanical, electrical, thermal, optical, magnetic
Processing -- how materials are made and shaped
Performance -- behavior in real-world applications
Core Disciplines
Metallurgy and physical metallurgy
Polymer science and engineering
Ceramic engineering
Solid-state physics
Computational materials science
Biomaterials and tissue engineering
3 / 32

Slide 04

Historical Foundations

~8000 BCECopper smelting begins in Anatolia -- humanity's first extracted metal.
~3300 BCEBronze Age begins. Tin-copper alloys create harder tools and weapons, transforming civilizations across Mesopotamia and the Aegean.
~1200 BCEIron Age. Hittites develop iron smelting; carbon-steel weapons eventually surpass bronze.
~500 CEWootz steel (crucible steel) produced in India; the famed Damascus steel blades derive from this tradition.
1856Henry Bessemer patents the Bessemer process, enabling mass production of steel and catalyzing the Industrial Revolution.
1907Leo Baekeland invents Bakelite, the first fully synthetic plastic, launching the polymer age.
1947Transistor invented at Bell Labs using germanium semiconductor -- the birth of the electronics era.
1985Discovery of fullerenes (buckyballs) by Kroto, Curl, and Smalley; leads to 1996 Nobel Prize in Chemistry.
2004Geim and Novoselov isolate graphene at University of Manchester, opening the 2D materials revolution (2010 Nobel Prize).
4 / 32

Slide 05

Atomic Structure & Bonding

The properties of every material ultimately derive from how its atoms are bonded together. There are four primary bonding mechanisms, each producing dramatically different material behaviors.
Metallic Bonding
Valence electrons form a delocalized "electron sea" shared among positive ion cores. This explains metals' electrical conductivity (Cu: 5.96 x 10^7 S/m), thermal conductivity, ductility, and metallic luster. The non-directional nature allows atoms to slide past each other without breaking bonds.
Covalent Bonding
Electrons are shared between specific atom pairs in directional bonds. Diamond (sp3 carbon) has the highest hardness (10 on Mohs scale) and thermal conductivity (~2200 W/mK) of any natural material, but is an electrical insulator due to its large band gap (5.47 eV).
Ionic Bonding
Electrons transfer between atoms, creating charged ions held by electrostatic attraction. NaCl has a lattice energy of 786 kJ/mol. Ionic materials are hard, brittle, have high melting points (NaCl: 801C), and conduct electricity only when molten or dissolved.
Van der Waals & Hydrogen
Weak intermolecular forces. Van der Waals bonds hold graphite layers together (interlayer energy ~50 meV/atom), enabling easy shearing and lubrication. Hydrogen bonds (10-40 kJ/mol) govern water's properties and protein folding.
5 / 32

Slide 06

Crystal Structures

About 95% of metals crystallize in one of three structures: FCC, BCC, or HCP. Crystal structure determines slip systems, which directly control ductility and strength.
FCC (Face-Centered Cubic)
APF: 0.74. 12 slip systems. Generally ductile and formable.
Examples: Aluminum, Copper, Gold, Silver, Nickel, Lead, Platinum
Coordination number: 12. Atoms per unit cell: 4.
BCC (Body-Centered Cubic)
APF: 0.68. 48 slip systems but higher critical resolved shear stress.
Examples: Iron (alpha), Chromium, Tungsten, Molybdenum, Vanadium
Coordination number: 8. Atoms per unit cell: 2.
HCP (Hexagonal Close-Packed)
APF: 0.74. Only 3 slip systems -- limited ductility at room temperature.
Examples: Titanium, Magnesium, Zinc, Cobalt, Zirconium
Coordination number: 12. c/a ratio ideally 1.633.
Polymorphism (Allotropy)
Iron transforms from BCC (alpha, ferrite) to FCC (gamma, austenite) at 912C, then back to BCC (delta) at 1394C before melting at 1538C. This gamma-to-alpha transformation is the basis of all steel heat treatment.
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Slide 07

Defects & Dislocations

Perfect crystals exist only in theory. Real materials contain defects at every scale, and these defects often control mechanical behavior more than the crystal structure itself.
Point Defects
Vacancies: Missing atoms. Concentration follows Arrhenius equation: n/N = exp(-Qv/kT). At 1000C, copper has ~10^-4 vacancy fraction
Interstitials: Extra atoms squeezed between lattice sites. Carbon in iron (max 2.14 wt% in FCC, only 0.022% in BCC)
Substitutional: Foreign atoms replacing host atoms. Governs alloy properties (e.g., Ni in Cu creates cupronickel)
Line Defects (Dislocations)
Edge dislocations: Extra half-plane of atoms inserted. Burgers vector perpendicular to dislocation line
Screw dislocations: Crystal sheared so atoms spiral around the line. Burgers vector parallel to line
Typical dislocation density: annealed metal ~10^6/cm2, heavily cold-worked ~10^12/cm2
Theoretical shear strength is ~G/30; dislocations reduce actual strength by factor of 100-1000
"The key to understanding the mechanical properties of metals lies in understanding dislocations." -- Sir Alan Cottrell, 1953
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Slide 08

Metals & Alloys

Metals constitute about 80% of the elements in the periodic table. Their versatility stems from metallic bonding, which allows alloying to tune properties across an enormous range.
~1.9B
Tonnes of steel produced globally (2023)
69M
Tonnes of aluminum produced (2023)
25M
Tonnes of copper produced (2023)
$5.3T
Global metals market value
Strengthening Mechanisms
Solid solution: Foreign atoms distort lattice, impede dislocations
Strain hardening: Cold working increases dislocation density
Grain refinement: Hall-Petch relationship -- smaller grains = higher strength
Precipitation hardening: Nano-scale precipitates block dislocation motion (e.g., Al-Cu age hardening)
Key Alloy Families
Steels: Fe-C system, 1500+ grades
Aluminum alloys: 2xxx-8xxx series, density 2.7 g/cm3
Titanium alloys: Ti-6Al-4V dominates aerospace (60% of all Ti)
Superalloys: Ni-based, operate at >85% of melting point in turbines
Shape memory: Nitinol (Ni-Ti) -- recovers up to 8% strain
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Slide 09

Steel: The Backbone of Civilization

Steel is the world's most important engineering material, with over 3,500 different grades. The Fe-C system is the most studied phase diagram in metallurgy.
Carbon Steel Classifications
TypeCarbon %Applications
Low carbon<0.25%Auto body panels, structural shapes, wire
Medium carbon0.25-0.60%Rails, gears, crankshafts
High carbon0.60-1.0%Springs, cutting tools, piano wire
Cast iron2.1-4.5%Engine blocks, pipes, cookware
Microstructures
Ferrite: Soft BCC phase, yield strength ~250 MPa
Pearlite: Lamellar ferrite + cementite, ~800 MPa tensile
Bainite: Fine acicular structure, 800-1200 MPa
Martensite: Supersaturated BCT phase, up to 2000+ MPa but brittle; must be tempered
Austenite: FCC phase, stable at high T or with Ni/Mn additions (stainless steels)
Stainless steels contain minimum 10.5% Cr, forming a passive Cr2O3 layer. The 304 grade (18Cr-8Ni) is the most widely used, accounting for over 50% of all stainless steel production worldwide.
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Slide 10

Aluminum & Light Metals

Aluminum, at 2.7 g/cm3 (one-third the density of steel), is the second most widely used metal. The Hall-Heroult electrolysis process (1886) made it commercially viable.
Aluminum Alloy Series
SeriesAlloying ElementKey Use
1xxxPure Al (>99%)Foil, electrical conductors
2xxxCopperAerospace (2024-T3: fuselage skins)
5xxxMagnesiumMarine, auto body (5052, 5083)
6xxxMg + SiExtrusions, architectural (6061)
7xxxZincAerospace high-strength (7075-T6: 572 MPa)
Other Light Metals
Magnesium: 1.74 g/cm3, lightest structural metal. Used in laptops, cameras, auto parts. 33% lighter than Al but poor corrosion resistance
Titanium: 4.51 g/cm3, exceptional strength-to-weight ratio. Ti-6Al-4V has 900 MPa yield strength. Dominant in jet engines, medical implants (excellent biocompatibility)
Beryllium: 1.85 g/cm3, highest specific stiffness of any metal. Used in satellite structures and X-ray windows. Toxic dust is a serious occupational hazard
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Slide 11

Ceramics

Ceramics are inorganic, non-metallic solids with ionic and/or covalent bonding. They excel in hardness, thermal resistance, and chemical inertness, but suffer from brittleness due to lack of dislocation mobility.
Traditional Ceramics
Clay-based: porcelain, stoneware, brick, tile. Silicate glasses: soda-lime (windows), borosilicate (Pyrex, lab ware). Produced by humanity for over 26,000 years (Venus of Dolni Vestonice, oldest known ceramic artifact).
Advanced Structural
Al2O3 (alumina): Hardness 9 Mohs, used in cutting tools, armor, hip implants. Si3N4: Turbine blades, ball bearings. SiC: Abrasives, Diesel particulate filters, nuclear cladding. ZrO2 (zirconia): Toughened with Y2O3, used in dental crowns, fuel cell electrolytes.
Functional Ceramics
BaTiO3: Piezoelectric, used in capacitors (MLCC), the most produced electronic component (~3 trillion/year). PZT: Piezo transducers and actuators. YSZ: Solid oxide fuel cell electrolytes, thermal barrier coatings.
Fracture toughness is the Achilles heel of ceramics: Al2O3 has K_IC ~ 3-5 MPa-m^(1/2), vs. ~50 for steel. Transformation toughening in ZrO2 (stress-induced tetragonal-to-monoclinic phase change) can raise this to ~12 MPa-m^(1/2).
11 / 32

Slide 12

Polymers

Polymers are long-chain molecules built from repeating monomer units. The global plastics market exceeds $600 billion, with annual production over 400 million tonnes. The field was revolutionized by Staudinger's macromolecular hypothesis (1920, Nobel 1953).
Thermoplastics
Soften on heating, can be remolded. Linear or branched chains with secondary bonds between chains.
PE: Most produced plastic (~100 Mt/yr). HDPE: bottles, pipes; LDPE: film, bags
PP: Automotive parts, packaging, fibers. Tm ~165C
PET: Beverage bottles, polyester fiber. Tg ~75C
PEEK: High-performance, Tg 143C, used in aerospace and spinal implants ($80-120/kg)
Nylon (PA6,6): Gears, bearings, carpet fiber. First synthetic fiber (1935, DuPont)
Thermosets & Elastomers
Thermosets: Cross-linked networks, cannot remelt.
Epoxy: Adhesives, composite matrices, PCBs (Tg 120-220C)
Phenolics: Bakelite; brake pads, electrical insulation
Polyurethane: Foams, coatings, elastomers
Elastomers: Lightly cross-linked, enormous elastic strain.
Natural rubber: Tg = -70C, elongation >500%
Silicone: -55C to 300C operating range; medical, cookware
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Slide 13

Composites

Composites combine two or more materials to achieve properties unattainable by either constituent alone. The global composites market was valued at ~$95 billion in 2023, growing at 7% CAGR.
Carbon Fiber Reinforced Polymer (CFRP)
Tensile strength: 1500-6000 MPa; density: 1.55 g/cm3
Specific strength 5-10x that of steel
Boeing 787: 50% CFRP by weight, saving ~20% fuel vs. aluminum design
Standard modulus fiber (T300): ~230 GPa; Ultra-high modulus (M60J): ~588 GPa
Cost: $15-30/kg (standard); $100+/kg (aerospace grade)
Glass Fiber Reinforced Polymer (GFRP)
E-glass: tensile strength ~3.4 GPa, cost $1-3/kg
Dominant in wind turbine blades (some >100 m long)
Boats, automotive panels, tanks, pipes
Lower performance than CFRP but 10-20x cheaper
Metal Matrix Composites
Al-SiC: brake discs (Porsche, Brembo), satellite structures
Ti-SiC: jet engine compressor blades
Ceramic Matrix Composites (CMCs) are the frontier: SiC/SiC composites operate at 1300C+ in LEAP and GE9X jet engines, replacing nickel superalloys and saving ~1000 lbs per aircraft. GE has invested over $1.5 billion in CMC production facilities.
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Slide 14

Semiconductors

Semiconductors have electrical conductivity between metals and insulators, controllable by doping, temperature, and light. They underpin the $600 billion global chip industry.
Silicon: The King
Band gap: 1.12 eV (indirect). Abundance: 27.7% of Earth's crust
Czochralski process grows 300mm (12-inch) single-crystal ingots up to 2m long
Purity: 99.9999999% (nine nines) for electronic grade
Doping: P or As (n-type), B (p-type) at ppm to ppb levels
TSMC's 3nm node: ~300 million transistors per mm2
Beyond Silicon
GaAs: Direct band gap 1.42 eV, used in LEDs, laser diodes, RF chips, solar cells (highest single-junction efficiency: 29.1%)
GaN: Band gap 3.4 eV, power electronics and blue/UV LEDs (Nakamura, 2014 Nobel Prize)
SiC: 3.26 eV, high-voltage power devices for EVs (Tesla Model 3 inverter uses SiC MOSFETs)
Ga2O3: Ultra-wide band gap (4.8 eV), emerging for high-power applications
14 / 32

Slide 15

Biomaterials

Biomaterials are designed to interact with biological systems for medical purposes. The global biomaterials market exceeded $200 billion in 2023, driven by aging populations and advances in tissue engineering.
Metallic Implants
Ti-6Al-4V: Gold standard for orthopedic and dental implants. Osseointegration discovered by Branemark (1952)
CoCrMo: Hip/knee joint replacements, 230 GPa modulus
316L stainless: Bone plates, screws (lower cost alternative)
Mg alloys: Biodegradable implants that dissolve as bone heals
Ceramic Biomaterials
Hydroxyapatite: Ca10(PO4)6(OH)2, same as bone mineral. Used as coatings on Ti implants
Bioglass (45S5): Bonds to both bone and soft tissue; invented by Larry Hench (1969)
Alumina/Zirconia: Bearing surfaces in hip joints, extremely low wear
Polymeric Biomaterials
UHMWPE: Hip/knee bearing surfaces, ~5 million molecular weight
PLGA: Biodegradable sutures, drug delivery scaffolds
Hydrogels: Contact lenses, wound dressings, tissue scaffolds
PDMS (silicone): Breast implants, catheters, microfluidics
15 / 32

Slide 16

Nanomaterials

Materials with at least one dimension below 100 nm exhibit properties dramatically different from their bulk counterparts due to quantum confinement and enormous surface-to-volume ratios.
Carbon Nanomaterials
Carbon nanotubes (CNTs): Discovered by Iijima (1991). Tensile strength ~100 GPa, Young's modulus ~1 TPa. Electrical conductivity comparable to copper. Applications: composites, field emitters, transistors
Graphene: Single layer of graphite. Strongest material measured (130 GPa intrinsic strength). Electron mobility 200,000 cm2/Vs. Thermal conductivity ~5000 W/mK
Fullerenes: C60, C70. Drug delivery, organic photovoltaics
Quantum Dots & Nanoparticles
Quantum dots: CdSe, InP nanocrystals (2-10 nm). Size-tunable emission from blue to red. Used in QLED displays (Samsung), biological imaging. Bawendi, Brus, Ekimov won 2023 Nobel Prize in Chemistry
Au/Ag nanoparticles: Plasmonics, SERS sensors, cancer therapy
TiO2 nanoparticles: Photocatalysis, self-cleaning surfaces, sunscreens
Fe3O4: MRI contrast agents, magnetic hyperthermia
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Slide 17

Smart Materials

Smart materials respond to external stimuli (temperature, stress, electric/magnetic fields, light) with a predictable, useful change in properties.
Shape Memory Alloys
Nitinol (Ni-Ti): Discovered at Naval Ordnance Lab (1959). Recovers up to 8% strain via martensitic-to-austenitic phase transformation. Transformation temperature tunable from -100 to +100C by composition.
Applications: Stents (>500,000 implanted/year), orthodontic archwires, satellite antennas, earthquake-resistant connections.
Piezoelectrics
PZT (Pb(Zr,Ti)O3): d33 coefficient ~300-600 pC/N. Used in ultrasound transducers, fuel injectors, energy harvesters, sonar. Market: ~$35 billion (2023).
Lead-free alternatives: BaTiO3, KNN, BiFeO3 being developed due to RoHS regulations restricting lead.
Magnetostrictive
Terfenol-D (Tb-Dy-Fe): Strain of ~1600 ppm in magnetic field. Used in sonar transducers, vibration dampers, precision actuators.
Electrochromic
WO3 films: Change from transparent to blue under applied voltage. Smart windows (View Inc.) reduce building HVAC costs by 20-25%. Transition time: 5-15 minutes.
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Slide 18

Superconductors

Below a critical temperature (Tc), certain materials exhibit zero electrical resistance and expel magnetic fields (Meissner effect). Discovered by Kamerlingh Onnes in 1911 (mercury, Tc = 4.2K).
Low-Temperature (LTS)
NbTi: Tc = 9.3K, most widely used superconductor. MRI magnets (>50,000 installed globally), particle accelerators (LHC uses 1,232 dipole magnets with NbTi cable)
Nb3Sn: Tc = 18.3K, higher field capability (>20T). Used in ITER fusion reactor magnets and next-gen MRI
High-Temperature (HTS)
YBCO: Tc = 93K (above liquid N2 at 77K). Bednorz & Muller, 1987 Nobel Prize. Used in power cables, fault current limiters
REBCO tape: 2nd generation HTS wire. Enables compact fusion magnets (Commonwealth Fusion Systems' 20T magnet, 2021)
MgB2: Tc = 39K, simple binary compound. Low-cost MRI magnets
Room temperature: Still elusive. LaH10 at 250 GPa shows Tc ~250K but requires diamond anvil pressures
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Slide 19

Phase Diagrams

Phase diagrams are maps showing which phases are thermodynamically stable at given compositions and temperatures. They are indispensable tools for alloy design and processing.
Key Diagram Types
Binary isomorphous: Complete solid solubility (Cu-Ni). Single lens-shaped two-phase region
Binary eutectic: Limited solubility, eutectic reaction: L -> alpha + beta. Example: Pb-Sn (solder), eutectic at 183C, 61.9% Sn
Eutectoid: Solid-state equivalent. Fe-C: gamma -> alpha + Fe3C at 727C, 0.76% C
Peritectic: L + alpha -> beta. Example: Fe-C at 1495C
The Iron-Carbon Diagram
The most important phase diagram in engineering. Critical points:
A1 (727C): Eutectoid temperature; pearlite forms below
A3 line: Austenite-to-ferrite boundary (depends on C%)
Acm line: Austenite-to-cementite boundary
Eutectic (1147C, 4.3% C): Liquid -> austenite + cementite (cast iron)
Lever rule used to calculate phase fractions at any point
"Show me the phase diagram, and I will tell you the microstructure. Show me the microstructure, and I will tell you the properties." -- traditional metallurgist's maxim
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Slide 20

Mechanical Properties

Mechanical testing quantifies how materials respond to applied forces. The tensile test remains the most fundamental characterization method.
Key Properties
PropertyDefinitionUnit
Young's modulus (E)Stress/strain in elastic regionGPa
Yield strengthOnset of plastic deformation (0.2% offset)MPa
UTSMaximum engineering stressMPa
Elongation% strain at fracture%
HardnessResistance to indentationHV, HRC
ToughnessEnergy absorbed before fractureJ/m3
Fatigue strengthStress for 10^7 cycles without failureMPa
Comparative Moduli
MaterialE (GPa)Density (g/cm3)
Diamond10503.52
Tungsten carbide62015.6
Steel2007.85
Titanium1164.51
Aluminum692.70
CFRP70-2301.55
HDPE0.80.95
Rubber0.001-0.11.1
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Slide 21

Thermal Properties

How materials respond to heat determines their suitability for applications ranging from jet engine components to microchip heat sinks.
Thermal Conductivity (W/mK)
Diamond: 2200 (highest of any bulk material)
Copper: 401
Aluminum: 237
Steel: 50
Alumina: 30
Glass: 1.0
PTFE: 0.25
Aerogel: 0.013 (best bulk insulator)
Thermal Expansion (CTE, ppm/C)
Invar (Fe-36Ni): 1.2 (invented 1896 by Guillaume, 1920 Nobel Prize)
Silicon: 2.6
Steel: 12
Aluminum: 23
HDPE: 100-200
Fused silica: 0.55
CTE mismatch causes thermal stresses at interfaces. Critical in electronic packaging: Si chip (2.6) on FR-4 board (14-17).
Thermal barrier coatings (TBCs) of yttria-stabilized zirconia protect Ni-superalloy turbine blades, enabling gas temperatures 200-300C above the alloy's melting point. A 250-micron TBC can create a 170C temperature drop.
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Slide 22

Corrosion & Degradation

Corrosion costs the global economy an estimated $2.5 trillion annually (NACE, 3.4% of global GDP). Understanding and preventing degradation is a core challenge in materials engineering.
Types of Corrosion
Uniform: Even metal loss. Predictable, manageable with coatings/inhibitors
Galvanic: Dissimilar metals in electrolyte. More noble metal cathode protected; active metal corrodes faster (e.g., steel rivets in Al panel)
Pitting: Localized attack by chloride ions breaking passive films. Especially dangerous in stainless steels, Al alloys
Crevice: Oxygen depletion in gaps creates aggressive local chemistry
Stress corrosion cracking (SCC): Tensile stress + corrosive environment = brittle cracking at stresses well below yield
Intergranular: Preferential attack at grain boundaries (sensitized 304 SS: Cr depletion at boundaries due to Cr23C6 precipitation at 450-850C)
Protection Strategies
Coatings: Paint, galvanizing (Zn), anodizing (Al2O3 on Al), powder coating, thermal spray
Cathodic protection: Sacrificial anodes (Zn on ship hulls) or impressed current (pipelines)
Alloy design: Adding Cr (stainless), Mo (pitting resistance), N (resistance to SCC)
Inhibitors: Chromates (being phased out), phosphates, organic film-formers
Environmental control: Dehumidification, deoxygenation, pH adjustment
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Slide 23

Failure Analysis

Understanding why materials fail is as important as designing them. Catastrophic failures have driven major advances in materials science and engineering standards.
Historic Failures
Liberty Ships (1943): Brittle fracture of welded steel hulls in cold water. Led to development of fracture mechanics and Charpy impact testing requirements
De Havilland Comet (1954): Fatigue cracks at rivet holes near square windows propagated catastrophically. Led to damage-tolerant design philosophy in aerospace
Aloha Airlines 243 (1988): Fuselage fatigue cracking from multi-site damage after 89,090 cycles. Changed aircraft inspection protocols
Deepwater Horizon (2010): Multiple material and design failures in blowout preventer; blind shear ram couldn't cut drill pipe
Failure Modes
Ductile fracture: Microvoid coalescence, dimpled surface. Warning via necking/deformation. Preferred failure mode
Brittle fracture: Cleavage or intergranular. No warning. Governed by Griffith/Irwin fracture mechanics: K_IC = Y * sigma * sqrt(pi*a)
Fatigue: Progressive damage from cyclic loading. S-N curves, Paris law: da/dN = C(delta_K)^m. Causes ~90% of all mechanical failures
Creep: Time-dependent deformation at high temperature (T > 0.4 Tm). Larson-Miller parameter used for life prediction
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Slide 24

Characterization Techniques

Modern materials science relies on a suite of analytical tools spanning length scales from angstroms to meters.
Microscopy
Optical: Up to 1000x, resolution ~200 nm (diffraction limit)
SEM: Secondary/backscatter electrons, 10nm resolution, EDS for composition
TEM: Sub-angstrom resolution, lattice imaging, EELS, diffraction. Sample must be AFM: Surface topology, sub-nm z-resolution, force mapping
Diffraction & Spectroscopy
XRD: Crystal structure, phase identification, residual stress. Bragg's law: n*lambda = 2d*sin(theta)
XPS: Surface composition and chemical state, top 1-10 nm
Raman: Molecular vibrations, stress in Si, graphene quality (G/D ratio)
FTIR: Polymer identification, functional groups
Mechanical Testing
Tensile: ASTM E8, stress-strain curve
Hardness: Vickers, Rockwell, Brinell, nanoindentation
Impact: Charpy V-notch, Izod
Fatigue: Rotating beam, servo-hydraulic
DMA: Viscoelastic properties, Tg determination
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Slide 25

Computational Materials Science

Computing has transformed materials science from an empirical discipline to one with predictive power across all length and time scales.
Methods by Scale
DFT (Density Functional Theory): Quantum mechanical, ~100 atoms. Band structures, formation energies, elastic constants. Codes: VASP, Quantum ESPRESSO. Kohn & Sham, 1998 Nobel Prize
Molecular Dynamics: Classical potentials, 10^6-10^9 atoms, picoseconds to microseconds. Crack propagation, diffusion, protein folding (LAMMPS, GROMACS)
Phase-field: Microstructure evolution. Solidification, grain growth, spinodal decomposition. Mesoscale (microns to mm)
FEA (Finite Element): Continuum mechanics, component-level stress/strain (ABAQUS, ANSYS). Macroscale
Materials Informatics & AI
Materials Project (MIT): Database of >150,000 computed materials with properties from DFT. Open access
AFLOW: >3.5 million compounds computed. Automatic workflow for high-throughput DFT
Machine learning: GNoME (DeepMind, 2023) predicted 2.2 million stable crystal structures, 380,000 validated experimentally
CALPHAD: Thermodynamic modeling of multicomponent phase diagrams from assessed experimental data (Thermo-Calc, FactSage)
"The era of Edisonian trial-and-error in materials discovery is ending. Computation and AI are now the fastest path to new materials." -- Materials Genome Initiative, 2011
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Slide 26

Additive Manufacturing

3D printing has evolved from rapid prototyping to production of final parts, fundamentally changing how we think about design-for-manufacturing constraints.
Metal AM Processes
Laser Powder Bed Fusion (LPBF/SLM): 20-50 micron layers, resolution ~100 micron. Ti-6Al-4V, Inconel 718, 316L SS. Dominant for aerospace/medical (>$3B market)
Electron Beam Melting (EBM): Arcam/GE. Vacuum process, lower residual stress. FDA-cleared Ti-6Al-4V hip cups (>100,000 implanted)
Directed Energy Deposition (DED): Powder or wire fed into melt pool. Repair, large parts, functionally graded materials
Binder Jetting: Metal powder + binder, then sintered. High throughput, lower cost. Desktop Metal, HP Metal Jet
Advantages & Challenges
Advantages:
Topology-optimized designs: 40-70% weight reduction possible
Part consolidation: GE LEAP fuel nozzle went from 20 parts to 1
Lattice structures for lightweighting and energy absorption
Mass customization (medical implants, dental crowns)
Challenges:
Surface roughness: Ra 5-25 micron (requires post-machining for critical surfaces)
Residual stresses from rapid heating/cooling cycles
Porosity, lack-of-fusion defects, anisotropy
Build rate: 5-20 cm3/hr for LPBF (slow for large volumes)
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Slide 27

Energy Materials

The global energy transition depends critically on materials innovation -- batteries, solar cells, catalysts, and hydrogen technologies all face materials bottlenecks.
Batteries
Li-ion (LiCoO2/graphite): 250 Wh/kg, $120/kWh (2024, down from $1100/kWh in 2010). Goodenough, Whittingham, Yoshino -- 2019 Nobel Prize
LFP (LiFePO4): Lower energy density but safer, cheaper, longer cycle life. Dominant in Chinese EVs (BYD Blade)
NMC 811: Ni-rich cathodes for maximum energy density (>300 Wh/kg cells)
Solid-state: Ceramic or polymer electrolyte replaces liquid. Toyota, QuantumScape targeting >400 Wh/kg by 2028
Sodium-ion: Abundant Na replaces Li. CATL's first-gen: 160 Wh/kg, targeting low-cost storage
Solar & Hydrogen
Silicon PV: Mono-PERC efficiency >24%, module cost ~$0.15/Wp. Dominates 95% of market
Perovskites: ABX3 halide structure, lab efficiency 26.1% (single-junction). Tandem with Si: 33.9%. Stability challenge: moisture, heat degradation
Electrolyzers: PEM (Pt/Ir catalysts, scarce), alkaline (Ni-based, cheaper), SOEC (ceramic, highest efficiency at 800C)
Hydrogen storage: Metal hydrides (MgH2, LaNi5H6), MOFs, carbon nanotubes. DOE target: 6.5 wt% system-level
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Slide 28

Metamaterials

Metamaterials are engineered structures with properties not found in nature, deriving function from geometry rather than chemistry. Their unit cells are sub-wavelength, so they behave as effective homogeneous media.
Electromagnetic Metamaterials
Negative refractive index: Predicted by Veselago (1968), demonstrated by Pendry & Smith (2000). Light bends "backward"
Cloaking: Transformation optics can guide light around an object. Demonstrated at microwave frequencies (2006, Duke University)
Perfect lenses: Overcome diffraction limit theoretically. Near-field superlens demonstrated with Ag slab (2005)
Metasurfaces: 2D metamaterials, flat optical components. Metalenz commercializing for smartphone cameras
Mechanical Metamaterials
Auxetic: Negative Poisson's ratio -- material expands laterally when stretched. Used in protective gear, stents
Pentamode: "Unfeelability" cloak; extremely low shear modulus relative to bulk modulus
Origami/kirigami: Fold/cut patterns creating programmable deformation. NASA deployable solar arrays
Phononic crystals: Band gaps for sound/vibration at specific frequencies. Seismic protection, noise barriers
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Slide 29

Sustainability in Materials

Materials production accounts for ~25% of global CO2 emissions. The circular economy demands rethinking material lifecycles from extraction through end-of-life.
Recycling Realities
MaterialRecycling RateEnergy Savings
Aluminum~75% (global)95% vs. primary
Steel~85%74% vs. BOF
Copper~45%85%
PET plastic~30%76%
E-waste~20%Varies widely
Rare earths<1%Not established
Green Materials Innovation
Green steel: HYBRIT (Sweden) using H2 instead of coke, aiming to eliminate 1.4 Gt CO2/year from steelmaking by 2045
Bio-based polymers: PLA from corn starch, PHA from bacteria, nanocellulose from wood pulp
Low-carbon cement: LC3 (limestone calcined clay cement) reduces CO2 by 40% vs. Portland cement
Critical minerals: Li, Co, Ni, rare earths face supply constraints. Urban mining and alternative chemistries are essential
The Materials Genome Initiative (launched 2011, US) aims to halve the time from discovery to deployment of new materials -- currently averaging 20 years. Similar initiatives exist in China, EU, and Japan.
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Slide 30

Key Figures in Materials Science

William Henry Bragg & William Lawrence Bragg
Father-son team who developed X-ray crystallography (1913). Nobel Prize in Physics 1915. W.L. Bragg remains the youngest Nobel laureate (age 25). Their work enabled determination of atomic structure in crystals.
Josiah Willard Gibbs
Developed thermodynamic framework for phase equilibria (1870s-80s). Gibbs phase rule (F = C - P + 2) and Gibbs free energy underpin all phase diagrams and materials thermodynamics.
Hermann Staudinger
Proposed that polymers are long-chain covalent molecules (1920), not colloidal aggregates as widely believed. Nobel Prize in Chemistry 1953. Founded polymer science as a discipline.
Alan Arnold Griffith
Established fracture mechanics with his 1921 paper on the energetics of crack propagation. The Griffith criterion relates fracture stress to crack size and surface energy, forming the basis of fracture mechanics.
John Goodenough
Co-invented the lithium-ion battery cathode (LiCoO2, 1980). Also contributed to RAM memory and Goodenough-Kanamori rules for magnetism. Nobel Prize in Chemistry 2019 at age 97.
Mildred Dresselhaus
"Queen of Carbon Science." Pioneered research on graphite intercalation, carbon nanotubes, and thermoelectrics at MIT over 50+ years. Presidential Medal of Freedom 2014.
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Slide 31

Industry & Economics

$7.8T
Global materials & chemicals industry (2023)
$580B
Semiconductor materials & equipment
$200B
Biomaterials market
$95B
Advanced composites
Career Landscape
Materials engineers: median salary $100,000 (US, 2024). Growth rate 5% through 2032
Top employers: Intel, TSMC, Boeing, GE Aerospace, 3M, Corning, ArcelorMittal, Applied Materials
Hot fields: battery materials, wide-bandgap semiconductors, AM/3D printing, computational discovery
Key degrees: Materials Science & Engineering, Metallurgy, Polymer Science, Ceramic Engineering
Research Frontiers (2024-2030)
High-entropy alloys: 5+ elements in near-equal proportions (e.g., CoCrFeMnNi "Cantor alloy")
2D materials beyond graphene: MoS2, hBN, MXenes
Self-healing materials: microcapsule, vascular, intrinsic healing mechanisms
Neuromorphic materials: memristive oxides for brain-inspired computing
Programmable matter: reconfigurable structures via origami/4D printing
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Slide 32

Reading List

Textbooks
Callister & Rethwisch -- Materials Science and Engineering: An Introduction (10th ed., 2020). The standard undergraduate text
Ashby & Jones -- Engineering Materials 1 & 2 (5th ed., 2019). Excellent property-based approach with Ashby charts
Shackelford -- Introduction to Materials Science for Engineers (9th ed., 2020). Clear, accessible
Askeland & Wright -- The Science and Engineering of Materials (7th ed., 2016). Strong on processing
Hosford -- Physical Metallurgy (2nd ed., 2010). Deep dive into metallic materials
Popular & Advanced
Mark Miodownik -- Stuff Matters (2014). Engaging popular science on everyday materials
Ainissa Ramirez -- The Alchemy of Us (2020). How materials inventions shaped human culture
Ashby -- Materials Selection in Mechanical Design (5th ed., 2017). Industry reference for material choice
Porter, Easterling & Sherif -- Phase Transformations in Metals and Alloys (3rd ed., 2009). Graduate-level thermodynamics & kinetics
Hull & Bacon -- Introduction to Dislocations (5th ed., 2011). Definitive dislocation theory text
Key Journals & Resources
Journals: Acta Materialia, Nature Materials, Advanced Materials, Journal of Materials Science, Scripta Materialia, Materials Today
Online: Materials Project (materialsproject.org), ASM International (asminternational.org), MatWeb (matweb.com), NIST Materials Data
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