期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 821, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.153509
关键词
Molecular dynamics simulation; Nano-polycrystalline; Nickel-titanium alloys; Martensitic transformation; Grain size
资金
- Beijing Institute of Applied Physics and Computational Mathematics [HG7017105]
- Open Foundation of Shanghai Key Laboratory of Mechanics in Energy Engineering [MEE201706]
- Science and Technology on Reactor System Design Technology Laboratory [HT-KFKT-10-2017001]
- National Natural Science Foundation of China Academy of Engineering Physics jointly set up NSAF fund [U1430119]
- Natural Science Foundation Project of CQ CSTC [cstc2018jcyjAX0581]
- Fundamental Research Funds for the Central Universities [XDJK2018B002]
In this study, the temperature- and stress-induced martensitic transformations in nano-polycrystalline nickel-titanium shape memory alloys were investigated using molecular dynamics simulations, and in turn the micro-mechanism was examined at the atomic scale. The transformation temperature and the stress hysteresis were found to decrease with the decreasing grain size when the grain size was less than 50 nm. The observed martensite variants' nucleation and growth phenomena during the martensitic transformation and its reverse one clearly demonstrated that the martensitic transformation was attributed to the formation of compound nanotwins structure inside the nano grains, which was a reasonable agreement with available experimental data. (C) 2019 Elsevier B.V. All rights reserved.
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