MSE250 - Exam 4
1. Phase
diagrams can be used to identify alloys that are eligible for .
a. age softening
b. pressure hardening
c. age hardening
d. pressure softening
e. none of the above: c. age hardening
2. Certain metal alloys can
be strengthened using and .
a. supersaturation; precipitation
b. undersaturation; precipitation
c. undersaturation; dissolution
d. supersaturation; dissolution
e. none of the above: a. supersaturation; precipitation
3. We can use phase diagrams and
graphs to predict the effects of and
on the strength of age-hardened alloys.
a. phase-transformation; phases; transformations
b. strength vs. time; temperature; time
c. phase-transformation; temperature; time
d. isothermal-transformation; isotherms; isochrons
e. none of the above: b. strength vs. time; temperature; time
4. Why do
blacksmiths dip hot metal objects in water? To them, in order to
them.
a. anneal; strengthen
b. quench; strengthen
c. anneal; increase ductility
d. quench; increase ductility
e. none of the above: b. quench; strengthen
5. We can obtain different by cooling steel a
different .
a. transmutations; isotherms
b. transmutations; rates
c. microstructures; isotherms
d. microstructures; rates
e. none of the above: d. microstructures; rates
6. Nucleation and
crystal growth are affected by quench and cooling .
a. temperature; rates
, MSE250 - Exam 4
b. density; mass
c. pressure; volume
d. time; temperature
e. none of the above: a. temperature; rates
, MSE250 - Exam 4
7. We can
control the strength of a steel part by manipulating its of .
a. isotherm; cooling
b. isotherm; heating
c. rate; cooling
d. microstructure; cooling
e. none of the above: c. rate; cooling
8. Martensite is caused by a change in
, not by of carbon.
a. transmuted elements; formation
b. formation of elements; volume
c. diffusion; crystal structure
d. crystal structure; melting
e. crystal structure; diffusion: e. crystal structure; diffusion
9. Aluminum can be age hardened by
adding 0.5% of Mg and 4% of , and quenching it from a temperature
of degrees C, and then letting it age over
.
a. Cu; 520; 24 hours
b. Fe; 52; 24 days
c. Pb; 5; 24 hours
d. Na; 5200; 24 days
e. none of the above: a. Cu; 520; 24 hours
10. The first aerospace aluminum alloy, used in the Wright airplane
crankcase, used hardening to strengthen the alloy.
a. martensitic
b. cementite
c. precipitation
d. work
e. none of the above: c. precipitation
11. Phase diagrams of age-hardenable alloys must show solid-
solubility with temperature.
a. increasing; decreasing
b. constant; increasing
c. infinite; decreasing
d. decreasing; decreasing
e. none of the above: d. decreasing; decreasing
12. The strength of an age-hardened alloy
with increasing ageing time at temperature, then reaches a , and
then after that.
, MSE250 - Exam 4
a. increases; maximum; decreases
b. decreases; minimum; increases
c. decreases; plateau; decreases
1. Phase
diagrams can be used to identify alloys that are eligible for .
a. age softening
b. pressure hardening
c. age hardening
d. pressure softening
e. none of the above: c. age hardening
2. Certain metal alloys can
be strengthened using and .
a. supersaturation; precipitation
b. undersaturation; precipitation
c. undersaturation; dissolution
d. supersaturation; dissolution
e. none of the above: a. supersaturation; precipitation
3. We can use phase diagrams and
graphs to predict the effects of and
on the strength of age-hardened alloys.
a. phase-transformation; phases; transformations
b. strength vs. time; temperature; time
c. phase-transformation; temperature; time
d. isothermal-transformation; isotherms; isochrons
e. none of the above: b. strength vs. time; temperature; time
4. Why do
blacksmiths dip hot metal objects in water? To them, in order to
them.
a. anneal; strengthen
b. quench; strengthen
c. anneal; increase ductility
d. quench; increase ductility
e. none of the above: b. quench; strengthen
5. We can obtain different by cooling steel a
different .
a. transmutations; isotherms
b. transmutations; rates
c. microstructures; isotherms
d. microstructures; rates
e. none of the above: d. microstructures; rates
6. Nucleation and
crystal growth are affected by quench and cooling .
a. temperature; rates
, MSE250 - Exam 4
b. density; mass
c. pressure; volume
d. time; temperature
e. none of the above: a. temperature; rates
, MSE250 - Exam 4
7. We can
control the strength of a steel part by manipulating its of .
a. isotherm; cooling
b. isotherm; heating
c. rate; cooling
d. microstructure; cooling
e. none of the above: c. rate; cooling
8. Martensite is caused by a change in
, not by of carbon.
a. transmuted elements; formation
b. formation of elements; volume
c. diffusion; crystal structure
d. crystal structure; melting
e. crystal structure; diffusion: e. crystal structure; diffusion
9. Aluminum can be age hardened by
adding 0.5% of Mg and 4% of , and quenching it from a temperature
of degrees C, and then letting it age over
.
a. Cu; 520; 24 hours
b. Fe; 52; 24 days
c. Pb; 5; 24 hours
d. Na; 5200; 24 days
e. none of the above: a. Cu; 520; 24 hours
10. The first aerospace aluminum alloy, used in the Wright airplane
crankcase, used hardening to strengthen the alloy.
a. martensitic
b. cementite
c. precipitation
d. work
e. none of the above: c. precipitation
11. Phase diagrams of age-hardenable alloys must show solid-
solubility with temperature.
a. increasing; decreasing
b. constant; increasing
c. infinite; decreasing
d. decreasing; decreasing
e. none of the above: d. decreasing; decreasing
12. The strength of an age-hardened alloy
with increasing ageing time at temperature, then reaches a , and
then after that.
, MSE250 - Exam 4
a. increases; maximum; decreases
b. decreases; minimum; increases
c. decreases; plateau; decreases
