07:20 - Fatigue cont'd
10:57 - Fracture surface images (fractography)
19:35 - Ways to Increase Fatigue Strength
29:20 - Motivation for studying creep
31:25 - Creep
40:40 - Creep Mechanisms

00:20 - Polyphase materials
12:10 - Cu-Ni phase diagram
18:50 - solubility limit and relationship to phase composition
24:10 - solubility in solids (e.g. Cu-Ag)
37:30 - inverse lever rule

00:10 - recap/two-phase example for hypothetical alloy A-B (handout)
07:45 - phase compositions/amounts of a two-phase region at different T
09:24 - atomic vs. weight percent (Li-Pb)
12:03 - phase regions (Cu-Zn); corrosion resistance; dashed lines at low T; one-two-one rule for phase regions at any isotherm
18:30 - line compound (Mg-Pb)
20:53 - microstructure of slowly cooled binary alloys
40:55 - invariant points (Cu-Al, handout)
49:40 - how did the "invariant point" get its name?

00:00 - plain carbon steel phase diagram (Fig 9.24); interstitial sites of carbon in ferrite and austenite
15:11 - importance of austenite
16:51 - invariant points in steel, cast iron vs. molded steel
20:17 - terminology around pearlite eutectoid point:
24:48 - microstucture around pearlite eutectoid point
31:30 - calculating microstructure amounts using inverse lever rule
37:55 - intro. to rate effects/phase transformation kinetics
46:50 - transformation kinetics handout
51:20 - time-temperature transformation diagram (Fig 10.13)

00:00 - steel time-temperature transformation diagram (Fig. 10.18)
00:55 - undercooling below the austenite eutectoid temperature / what is the T-t graph good for?
01:45 - pearlite: rapidly cool to 600°C, hold isothermally for 10³ s
04:24 - pearlite microstructure (Fig. 10.15)
10:08 - bainite: rapidly cool to 450°C, hold for 100 s (bainite microstructure: Fig. 10.17)
13:33 - martensite: diffusion-less quenching (Fig. 10.22 - *assume, for this class, that cooling is fast enough that ALL austenite transforms into martensite)
15:30 - metastability, crystal structure, and microstructure of martensite (Fig. 10.21)
21:14 - examples of incomplete transformations (Fig. 10.22; mix of pearlite/bainite + martensite)
27:43 - practical uses of isothermal heat treatment
30:00 - heat treatment at 2 different temperatures (Fig. 10.24)
33:53 - reasons for martensite's huge loss of ductility; reheating to obtain tempered martensite microstructure (not on T-t diagram!)
41:55 - spheroidite (not on T-t diagram!)
45:08 - microstructure of spheroidite vs. tempered martensite (Fig. 10.19/33)

00:00 - review: isothermal cooling T-t transformation diagram and microstructures for 0.76 wt.% (eutectoid) alloy (Fig. 10-22)
02:12 - isothermal T-t transformation diagram for 0.45 wt.% (hypoeutectoid) alloy (Fig. 10-39)
08:59 - isothermal T-t transformation diagram for 1.13 wt.% (hypereutectoid) alloy (Fig. 10-16)
16:05 - isothermal T-t transformation diagram for a 4340 alloy (Fig. 10-23)
17:45 - isothermal vs. continuous cooling curve for 0.76 wt.% (eutectoid) alloy (Fig. 10-26,27; class handout combines these figures)
26:38 - continuous cooling curve for 0.35 wt.% (hypoeutectoid) alloy (class handout)
30:10 - continuous cooling curve for 4340 alloy (Fig. 10-28)
32:58 - microstructure-property relationships (Fig. 10-30)
40:40 - comparing pearlite and martensite microstructure-property relationships (Fig. 10-32)
42:18 - precipitation (age) hardening in (non-ferrous) metals (Ch. 11.9)
43:28 - phase diagram requirements for an alloy to be precipitation (age) hardened
45:05 - procedure for precipitation hardening

00:00 - review of precipitation hardening
06:30 - precipitation hardening of Cu-Al (Fig. 11.24-25)
13:15 - "practical range" of precipitation hardening
17:15 - precipitation hardening synthesis-property relationships for a 2014 Al alloy (Fig. 11.27)
25:20 - introduction to ceramics
33:28 - bonding in ceramics
35:45 - general characteristics of ceramics
39:45 - properties of ionic crystalline ceramics

00:00 - ionic ceramic crystal structures
00:00 - AX crystal structures (zincblende, NaCl structure, CsCl structure)
04:40 - AmXp structures (CaF₂, Al₂O₃)
08:54 - AmBnXp (Ba₂TiO₄)
12:04 - covalent ceramic crystal structures (e.g. GaAs)
16:00 - silicate(SiO₄)-based ceramics
20:10 - clays (aluminosilicates)
20:33 - difference between silica, silicon, and silicone
21:15 - glasses
24:00 - carbon-based ceramics (diamond cubic structure, graphite, buckyball)
26:06 - defects in ceramics
28:45 - properties of ceramics: why are ceramics brittle? (*very important*)

00:00 - mechanical properties of ceramics
(fracture vs. yield strength, tensile vs. compressive loading; 4-point bending)
08:14 - factors affecting strength of ceramics
15:55 - relationships between stiffness/strength and porosity/size of specimen
18:45 - plane strain fracture toughness of ceramics
20;32 - ZrO2 (zirconia) Y2O3 (yttria) alloy; stress-induced phase transformation
24:18 - thermal properties of ceramics
38:00 - hardness and wear resistance of ceramics
43:00 - electrical properties of ceramics
44:50 - comparing volume vs. T of crystalline and non-crystalline (amorphous) materials - viscosity discussion

Audience questions
• How are point defects different in ceramics vs. in metals?
• Why does failure occur first at flaws in ceramics?
Precipitation hardening: what is the difference between the theta, theta-prime, theta-double prime phases (e.g. Cu-Be)?
• Precipitation hardening: can you precipitation-harden iron-carbide alloy?
• Difference between precipitation hardening and tempering
• In precipitation hardening: what is age hardening?
• If we start from martensite, what is the difference between getting tempered martensite and spheroidite?
Glass transition temperature vs. melting temperature, volume change
• Is there ever a direct transition from liquid to solid for amorphous materials?
• What does it mean if you're given the melting temperature for an amorphous material?
• What is shot peening?
• What to know for creep mechanisms?
TTT: "resetting the clock"
• Does the stress magnification at a crack apply for ductile or brittle materials, or both?
• What is the difference in microstructure between eutectic and eutectoid?
• Microstructure talk...
• In continuous cooling, will we be given the rate of cooling (e.g. 140 C/s)?
• What is the microstructure when you go through a peritectic/peritectoid point?
• Why is there no stress perpendicular to the surfaces (plane strain/stress)?
• What is nucleation?
• On the ductile-to-brittle transition graph, what does the y-axis (impact energy) mean?
• BCC, HCP, FCC ductile-to-brittle transition behavior
• Is electronegativity the primary way to determine ionic or covalent bonding?
• What are the concepts behind the different stages of creep?

00:00 - introduction to polymers
03:15 - bond angle of carbon backbone
05:00 - 24:00 - examples of common polymers (Table 14.3)
09:50 - structure-property relationship: chain mobility vs. T_g
24:42 - molecular structures of polymers
34:59 - elastomers
46:53 - vulcanization to obtain elasticity of rubber

00:00 - review of thermoplast, thermoset, elastomer characteristics
02:22 - molecular weight
05:00 - effect of molecular weight on properties
12:12 - tacticity
15:26 - copolymers
19:50 - copolymer example: thermoplastic elastomer (block styrene-butadiene, Fig. 15.22)
22:19 - crystallinity in polymers (thermoplasts only)
26:28 - effect of crystallinity on properties I
28:02 - factors that affect crystallinity (handout)
37:25 - example: branched atactic PS vs. linear isotactic PP
42:16 - effect of crystallinity on properties II
46:18 - stress-strain diagram for a simple thermoplast

00:00 - review of modulus vs. temperature for thermoplasts and elastomers
02:00 - fatigue of polymers
03:05 - crazing
06:30 - composites: motivation (ex: pole vault)
11:08 - definitions
14:56 - other examples of composites from sports
16:34 - overview of composite types
particle-reinforced composites
18:50 - large-particle composites
39:39 - cermets (ex: bandsaw blades)
41:56 - elastomer or plastic composites
43:45 - dispersion strengthened composites

fiber-reinforced composites
02:50 - specific strength, specific stiffness/modulus, and specific gravity
08:06 - definition of density of composites, ρ_c
10:43 - specific strength vs. specific modulus for metals and fiber composites
18:05 - importance of using fibers with thin dimensions
30:47 - fiber characteristics
34:39 - role of the matrix
36:36 - stresses in a fiber reinforced composite and the critical length

00:00 - review of critical fiber length
00:49 - fiber-matrix interfacial bonding
05:46 - strength of fiber-reinforced composites
22:13 - stiffness of fiber-reinforced composites
27:05 - 3 common fibers (glass, carbon/graphite, aramid/Kevlar)
42:33 - laminate composites
45:15 - sandwich panels

If anyone happens to listen to this, could you kindly email me the timing annotations, like I've done for all previous lectures? I'm sure everyone would appreciate it...

If anyone happens to listen to this, could you kindly email me the timing annotations, like I've done for all previous lectures? I'm sure everyone would appreciate it...

If anyone happens to listen to this, could you kindly email me the timing annotations, like I've done for all previous lectures? I'm sure everyone would appreciate it...

If anyone happens to listen to this, could you kindly email me the timing annotations, like I've done for all previous lectures? I'm sure everyone would appreciate it...