期刊
COMPUTATIONAL MATERIALS SCIENCE
卷 131, 期 -, 页码 132-138出版社
ELSEVIER
DOI: 10.1016/j.commatsci.2017.01.045
关键词
Pseudo-elasticity; Molecular dynamics; Phase transformation; Cyclic compression
资金
- National Natural Science Foundation of China [11532010]
- project for Sichuan Provincial Youth Science and Technology Innovation Team, China [2013TD0004]
The pseudo-elasticity of equiatomic NiTi shape memory alloy (SMA) nano-pillar subjected to a uniaxial cyclic compression is investigated by molecular dynamics (MD) simulation. By analyzing the local atomic structure, the nucleation sites and propagation paths of martensite transformation and its reverse, the degeneration of pseudo-elasticity and the interaction between martensitic transformation and defects at nano-scale during cyclic compressive deformation are discussed. It is indicated that the nucleation sites and propagation paths of the reverse transformation in the process of unloading are different from that observed in the process of loading (i.e., compression), and the dislocation and twinning are responsible for the changes in the atomic structure and mechanical response, the accumulated irreversible strain and the degeneration of pseudo-elasticity. (C) 2017 Elsevier B.V. All rights reserved.
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