MSE250 - Chapter 11, Sets 1 & 2 Questions With Complete
Solutions
A heavily deformed metal has a typical dislocation density of __
cm Correct Answers cm^3.
a. 13
b. 130
c. 1E13
d. 1E130
e. none of the above/
c. 1E13
Adding Cu to Ni increases the strength of Ni because the Cu
atoms create __ in the Ni which provide __ to __.
a. global lattice-strains; enhancers; vacancy formation
b. local lattice-strains; barriers; dislocation motion
c. local lattice-strains; enhancers; vacancy formation
d. global lattice-strains; barriers; dislocation formation
e. none of the above Correct Answers b. local lattice-strains;
barriers; dislocation motion
Aluminum rods are formed by a process of __.
a. forging
b. drawing c. rolling
d. extrusion
e. intrusion Correct Answers d. extrusion
An as-received metal has a typical dislocation density of __ cm
Correct Answers cm^3.
a. 8
b. 1E8
,c. 1E80
d. 1E800
e. none of the above/
b. 1E8
An auto-engine connecting rod is formed by a process of __.
a. forging
b. drawing
c. rolling
d. extrusion
e. intrusion Correct Answers a. forging
An edge dislocation has an extra __ compared to the pristine
crystal lattice.
a. line of atoms
b. plane of atoms
c. line of vacancies
d. plane of vacancies
e. none of the above Correct Answers b. plane of atoms
Annealing a cold-worked metal lowers the dislocation density to
about __ cm Correct Answers cm^3.
a. 8
b. 80
c. 800
d. 1E8
e. none of the above/
d. 1E8
As the amount of cold-working of a metal is increased, the
ductility of the metal __.
, a. increases
b. stays the same
c. decreases
d. decreases then increases
e. none of the above Correct Answers c. decreases
As the amount of cold-working of a metal is increased, the
tensile-strength of the metal __.
a. decreases
b. increases
c. stays the same
d. decreases then increases
e. none of the above Correct Answers b. increases
As the amount of cold-working of a metal is increased, the
yield-strength of the metal __.
a. decreases
b. stays the same
c. increases
d. decreases then increases
e. none of the above Correct Answers c. increases
Cold working of a metal results in __ of the metal.
a. strain softening
b. strain hardening
c. creep
d. fatigue hardening
e. none of the above Correct Answers b. strain hardening
Cold-working increases the __ density, __ strength and __
strength.
Solutions
A heavily deformed metal has a typical dislocation density of __
cm Correct Answers cm^3.
a. 13
b. 130
c. 1E13
d. 1E130
e. none of the above/
c. 1E13
Adding Cu to Ni increases the strength of Ni because the Cu
atoms create __ in the Ni which provide __ to __.
a. global lattice-strains; enhancers; vacancy formation
b. local lattice-strains; barriers; dislocation motion
c. local lattice-strains; enhancers; vacancy formation
d. global lattice-strains; barriers; dislocation formation
e. none of the above Correct Answers b. local lattice-strains;
barriers; dislocation motion
Aluminum rods are formed by a process of __.
a. forging
b. drawing c. rolling
d. extrusion
e. intrusion Correct Answers d. extrusion
An as-received metal has a typical dislocation density of __ cm
Correct Answers cm^3.
a. 8
b. 1E8
,c. 1E80
d. 1E800
e. none of the above/
b. 1E8
An auto-engine connecting rod is formed by a process of __.
a. forging
b. drawing
c. rolling
d. extrusion
e. intrusion Correct Answers a. forging
An edge dislocation has an extra __ compared to the pristine
crystal lattice.
a. line of atoms
b. plane of atoms
c. line of vacancies
d. plane of vacancies
e. none of the above Correct Answers b. plane of atoms
Annealing a cold-worked metal lowers the dislocation density to
about __ cm Correct Answers cm^3.
a. 8
b. 80
c. 800
d. 1E8
e. none of the above/
d. 1E8
As the amount of cold-working of a metal is increased, the
ductility of the metal __.
, a. increases
b. stays the same
c. decreases
d. decreases then increases
e. none of the above Correct Answers c. decreases
As the amount of cold-working of a metal is increased, the
tensile-strength of the metal __.
a. decreases
b. increases
c. stays the same
d. decreases then increases
e. none of the above Correct Answers b. increases
As the amount of cold-working of a metal is increased, the
yield-strength of the metal __.
a. decreases
b. stays the same
c. increases
d. decreases then increases
e. none of the above Correct Answers c. increases
Cold working of a metal results in __ of the metal.
a. strain softening
b. strain hardening
c. creep
d. fatigue hardening
e. none of the above Correct Answers b. strain hardening
Cold-working increases the __ density, __ strength and __
strength.
