Author/Authors :
Ni، نويسنده , , S. and Wang، نويسنده , , Y.B. and Liao، نويسنده , , X.Z. and Figueiredo، نويسنده , , R.B. and Li، نويسنده , , H.Q. and Zhao، نويسنده , , Y.H. and Lavernia، نويسنده , , E.J. and Ringer، نويسنده , , S.P. and Langdon، نويسنده , , T.G. and Zhu، نويسنده , , Y.T.، نويسنده ,
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.
Keywords :
strain softening , dislocation density , Lomer–Cottrell locks , Severe plastic deformation , Nanocrystalline materials
