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Quiz 1
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Q.1
The yield point can be completely recovered in a zinc crystal at _____
a) room temperature
b) 32⁰C
c) 50⁰C
d) 88⁰C
Q.2
Polygonization is associated with_____
a) grain size
b) plastically bent crystals
c) conductivity
d) strength of the material
Q.3
Polygonization is a process of _____
a) annealing a bent crystal
b) annealing a pure metal
c) heating the metal above recrystallization temperature
d) quenching
Q.4
The regrouping of edge dislocations into low-angle boundaries helps in _____
a) lowering the strain energy
b) increasing the stored energy
c) lowering the recrystallization temperature
d) increasing the strength of the metal
Q.5
An edge dislocation is capable of moving by a climb in a direction _____ to the slip plane.
a) 30⁰
b) 45⁰
c) 90⁰
d) 180⁰
Q.6
The rate of polygonization increases rapidly with _____
a) density
b) temperature
c) humidity
d) grain size
Q.7
As the polygon walls become more widely separated, the rate of ______becomes a decreasing function of time and temperature.
a) polygonization
b) decay
c) coalescence
d) grain growth
Q.8
The rate at which a recovery process occurs always decreases with _____
a) temperature
b) time
c) yield strength
d) ductility
Q.9
In deformed polycrystalline metals, high-temperature recovery is considered to be essentially a matter of polygonization.
a) True
b) False
Q.10
Recrystallization during an isothermal anneal begins very slowly.
a) True
b) False
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