How many states and phases in this mixture?

Solid copper
Liquid orange juice
Hydrogen gas
Water vapor

A) 3 states, 2 phases
B) 4 states, 0 phases
C) 2 states, 4 phases
D) 3 states, 4 phases (correct)

solid, liquid, gas OK. Presumably, the 4 phases are Cu, water, orange pulp, and the H gas-water vapor solution

What is a slip system?

a) A slip plane and an edge dislocation
b) A slip plane and a shear stress
c) A slip plane and a slip direction (correct)
d) An edge dislocation and a shear stress
e) An edge dislocation and a slip direction

What does T4 in 2024-T4 mean?

a. the metal is an aluminum alloy with 0.4% carbon
b. the metal is iron with 0.4% carbon
c. the metal is quenched from 492 C and aged at room temp (correct)
d. the metal is heated to 492 C and left there for 20 minutes

Which of the following is not a method for strengthening metals:

a) cold working
b) precipitation hardening
c) solution hardening
d) work hardening
e) none of the above (correct)

Hardness:

a) the measure of material's ability to undergo plastic deformation before fracture.
b) the capacity of a material to absorb energy when it is elastically deformed.
c) the measure of the amount of energy absorbed by a material as it fractures.
d) the measure of a material's resistance to deformation by surface indentation or by abrasion.
e) none of the above

d is correct, altho we have not discussed the scratch test (abrasion)

Which of the following facts about dislocations is false?

a. No dislocations = extremely strong material
b. Presence of dislocation weakens material
c. No dislocations = extremely ductile material (correct answer)
d. A lot of dislocations = strong material

Precipitation hardening is also called:

a) Solution hardening
b) Age hardening (correct)
c) Work hardening
d) Precipitation heat treatment
e) none of the above

What does dislocation motion primarily depend upon?

a) the type of alloy element in the material
b) the type of precipitates in the material
c) the number of slip systems (correct)
d) the force applied to the specimen

The higher the percent carbon in a steel,

a. the higher the brittle to ductile transition temperature (correct)
b. the lower the brittle to ductile transition temperature
c. the percent carbon does not effect the transition temperature
d. the more dislocations form upon heating
e. the fewer the dislocations form upon heating