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- Title
Effect of Annealing Treatment on Mechanical Properties of Nanocrystalline α-iron: an Atomistic Study.
- Authors
Tong, Xuhang; Zhang, Hao; Li, D. Y.
- 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 boundaries' resistance to intergranular cracks. The results indicate that the annealing treatment is an essential process for obtaining a well-defined NC structure with superior mechanical properties.
- Subjects
IRON; NANOCRYSTALS; ANNEALING of metals; MECHANICAL properties of metals; MATERIAL plasticity; CRYSTAL grain boundaries
- Publication
Scientific Reports, 2015, p8459
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep08459