Effect of annealing treatment on mechanical properties of nanocrystalline α-iron: an atomistic study.

ABSTRACT: Claims are often found in the literature that metallic materials can be nanocrystallized by severe plastic deformation (SPD). However, SPD does not generate a well-defined nanocrystalline (NC) material, which can be achieved by subsequent annealing/recovery treatment. In this study, molecular dynamics (MD) simulation is employed to study the effect of annealing on structure and mechanical properties of cyclic deformed NC α-iron, which simulates SPD-processed α-iron. It is demonstrated that grain boundaries in the deformed NC α-iron evolve to a more equilibrium state during annealing, eliminating or minimizing the residual stress. The annealing treatment increases the system's strength by reducing dislocation emission sources, and improves material ductility through strengthening grain boun

SUBMITTER: Tong X 

PROVIDER: S-EPMC4327417 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature