Metallurgical Engineering > GATE 2024 > Mechanical Behavior
A creep test of a pure polycrystalline metal is performed in tension and the creep strain rate is observed to decrease during the primary stage. The creep mechanism is later determined to be dislocation-climb-controlled. The observed decrease in creep strain rate is/are due to _______.
A
an increase in dislocation density.
B
grain growth.
C
a decrease in the dislocation density.
D
an increase in the cross-sectional area of the sample.

Correct : a,b

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