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Exam_2_Review - • How do dislocations participate in...

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MSE 201 Exam #2 Review Notes Chapter 5: Diffusion Diffusion mechanisms (vacancy vs. interstitial) Steady state diffusion (Constant flux, constant gradient, long time, mass flux) Non-steady state diffusion (short time, semi-infinite, erf(z)) Factors that influence diffusion (Temperature, types, sites) Chapter 6: Mechanical properties of metals Tension tests (dog bone samples) Engineering stress vs. Engineering strain (elastic modulus, Yield strength, tensile strength) What is engineering stress? What is engineering strain? How do they change as a function of temperature? Poisson’s ratio Necking Toughness, Ductility, Resilience, Hardness True stress and true strain Chapter 7: Dislocations and strengthening mechanisms
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Unformatted text preview: • How do dislocations participate in plastic damage? • What type of stress is needed? (tensile or shear) • How do dislocations interact with one another? • How does crystallinity play a role in plastic yielding? • Slip systems • Resolved shear stress and critical resolved shear stress • Strengthening mechanisms -Grain boundaries (smaller grains stronger, less ductile) -Alloying or solid solution strengthening (increased alloying results in stronger, less ductile) -Work or strain hardening (more % CW, increased strength, less ductility, reversible ) -Precipitation hardening • Recrystallization and recovery (What is recrystallization temperature) Chapter 8: Failure • Ductile, Semi-ductile, and brittle fracture...
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