Quiz 2: Things to know

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Ch. 6. Mechanical Properties of Metals

  • Differences between tensile, compressive and shear stress.
  • Hooke's law and the limits of applicability (equation).
  • Poisson's ratio for tension and compression.
  • How to obtain from a stress-strain diagram: 
  •     a) the Young modulus (elastic modulus)
        b) the yield strength
        c) the tensile strength
        d) ductility
        e) toughness
        f) resilience

  • Changes that occur to an object under stress until it fractures.
  • How is hardness measured and to what other property it is related.
  • What is elastic recovery
  • Ch. 7. Dislocation and strengthening mechanisms

  • What are edge and screw dislocations.
  • What is the Burgess vector and the angle it makes with the dislocation line.
  • Plastic deformation from dislocation slips.
  • What are slip planes and slip directions.
  • Relation between slip and packing directions.
  • How to relate yield stress and critical resolved shear stress (equation). 
  • How grains are deformed during plastic deformation.
  • Why slip is blocked by grain boundaries, defects, impurities
  • What is solid-solution strengthening.
  • What is  strain hardening (cold work), how % cold work relates to permanent strain, and and how it affects hardening.
  • What are recovery, recrystallization and grain growth and at what temperatures they occur. 
  • Ch. 8. Failure

  • What is fracture and how it starts
  • How crack propagate.
  • Why the strength of brittle materials is much lower than expected by theory.
  • How fracture toughness is defined.
  • How stress concentrates at a crack and how it depends on crack tip and length (equation).
  • How does the concentration factor depend on whether the crack is at the surface or in the bulk.
  • How fatigue is defined and the conditions under which it occurs.
  • Determine from a plot the fatigue lifetime and fatigue stress.
  • How creep is defined and how it happens.
  • Determine creep rate and rupture lifetime from a creep plot.
  • Ch. 9.  Phase diagrams

  • What is a phase diagram and what information does it give.
  • How to identify in a phase diagram which phases are present and which are the solidus, liquidus and solvus lines.
  • What is an eutectic and an eutectoid.
  • What are the eutectic and eutectoid reactions.
  • How to use a tie line to determine composition of each phase in a binary phase diagram.
  • How to use the lever rule to determine the fraction of each phase in a mixed phase region.
  • What are hypoeutectoid and hypereutectoid Fe-C alloys.
  • What are the different phases in a Fe-C diagram.
  • What is perlite and how it is formed.
  • What is the proeutectoid phase in both hyper- and hypoeutectoid alloys.
  • Describe the microstructure of a binary alloy at different points in the phase diagram.