Effects of Thermal Cycling and Porosity on Phase Transformation of Porous Nanocrystalline NiTi Shape Memory Alloy: An Atomistic Simulation

Author:

Liu Bingfei1,Wang Yuyang1ORCID,Wu Wenping23

Affiliation:

1. Aviation Engineering Institute Civil Aviation University of China Tianjin 300300 China

2. Department of Engineering Mechanics School of Civil Engineering Wuhan University Wuhan 430072 China

3. Shenzhen Research Institute Wuhan University Shenzhen 518063 China

Abstract

Herein, the effects of thermal cycling and porosity on the martensitic phase transformation behavior of porous nanocrystalline (NC) NiTi shape memory alloys (SMAs) at the atomic scale are investigated by molecular dynamics simulation. The simulation results show that thermal cycling causes the NC NiTi SMAs to repeatedly undergo martensitic phase transformation and inverse phase transformation processes. The martensitic phase transformation capability is suppressed with increasing porosity and number of cycles, but the suppression effect of thermal cycling is weakened with increasing porosity. Moreover, the start temperature of martensitic transformation, residual martensitic phase, and the fraction of interstitial atoms increase with increasing porosity. Thermal cycling causes the disordered structures and shear plastic deformation to accumulate as cycling increases. Recoverable shear deformation is generated within the grain, but shear plastic deformation is mainly concentrated at both grain boundaries and pore surfaces. Residual martensitic phase increases after thermal cycling. These results provide important explanations and references for a deeper understanding of phase transformation behavior and pore effects caused by thermal cycling.

Funder

National Natural Science Foundation of China

Basic and Applied Basic Research Foundation of Guangdong Province

Natural Science Foundation of Tianjin City

Fundamental Research Funds for the Central Universities

Tianjin Research Innovation Project for Postgraduate Students

Publisher

Wiley

Subject

Condensed Matter Physics,General Materials Science

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