Abstract
The influence of strain on the hardness of an electrochemically deposited nanocrystalline Ni–20 wt.% Fe alloy processed by high-pressure torsion (HPT) for 20 and 30 revolutions was investigated. Strain softening followed by a stable hardness value was observed. Structural investigations revealed that, while dislocation density was important, continuous grain growth played a major role in the strain softening. The stable hardness indicates that an equilibrium structure was achieved, supporting a dynamic balance between deformation-induced grain growth and grain refinement and between deformation-induced dislocation generation and dislocation annihilation.
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