| Cite this article as: Zheng Ye-Kun,Zhao Rui-Dong,Yu Chao. Effect of Ni4Ti3 precipitates on phase transformation behavior of NiTi superelastic shape memory alloy [J]. J. At. Mol. Phys.(原子与分子物理学报), 2024, 41: 066001 (in Chinese) |
| Effect of Ni4Ti3 precipitates on phase transformation behavior of NiTi superelastic shape memory alloy |
| Hits 175 Download times 25 Received:March 12, 2023 Revised:April 06, 2023 |
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| Key Words
Ni4Ti3 precipitated phase martensitic transformation molecular dynamics martensitic detwinning |
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| Abstract
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| The temperature-induced phase transformation and stress-induced phase transformation of coherent precipitated phase and semi-coherent precipitated phase block/pillar model were simulated by molecular dynamics method with second nearest neighbor correction embedded atom potential. The effect of Ni4Ti3 precipitates on the phase transformation behavior of NiTi shape memory alloy was analyzed. The results show that the elastic stress field induced by the intrinsic strain of Ni4Ti3 precipitated phase has an important effect on the type, nucleation location and distribution of martensitic variants during the phase transformation. During the temperature-induced phase transformation, the coherent precipitated phase promotes the nucleation and growth of some martensitic variants, which can significantly increase the martensitic transformation starting temperature of NiTi shape memory alloy. During the stress-induced phase transformation, the Ni4Ti3 precipitated phase makes the martensite nucleate earlier than the non-precipitated phase region, resulting in a decrease in the phase transformation stress, inhibiting the martensite detwinning, and reducing the hysteresis loop of the stress-strain curve. |
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