Superelastic stability of nanocrystalline NiTi shape memory alloy/Nb nanowire composite

被引：0

作者：

Wang T.-T. ^{[1
]}

Guo F.-M. ^{[2
]}

Wang Y.-S. ^{[1
]}

Zou X.-Y. ^{[1
]}

Wang B. ^{[1
]}

Liao Z.-N. ^{[1
]}

Ai T.-T. ^{[1
]}

He Z.-R. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong

[2] Department of Materials Science and Engineering, China University of Petroleum Beijing, Beijing

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2022年 / 32卷 / 11期

关键词：

Composite; Nanocrystalline; Nb nanowires; NiTi shape memory alloy; Superelasticity;

D O I：

10.11817/j.ysxb.1004.0609.2022-43021

中图分类号：

学科分类号：

摘要：

The conventional coarsed NiTi shape memory alloy often exhibits poor superelastic stability during martensitic transformation owing to their low strength. In this study, the nanocrystalline NiTi with an average grain size of 14 nm and Nb nanowires composites were obtained by melting, forging, wire drawing and annealing, the superelastic stability of composites was investigated by cyclic tensile tests. The results show that the nanocrystalline NiTi/Nb nanowire composite exhibits lower residual strain (0.52%), higher superelastic stress (748 MPa) and lower reduction rate of superelastic stress (16%) after ten cycles of loading (up to 6%)-unloading, which overall performance is improved compared to previous NiTi-based shape memory alloy. It is suggested that the improved superelastic stability of nanocrystalline NiTi/Nb nanowire composite mainly stems from enhancing the strength of the NiTi matrix by nano-grians and Nb nanowire, which resisting plastic deformation during the repetitive martensitic transformation and improving the superelastic stability. © 2022, China Science Publishing & Media Ltd. All right reserved.

引用

页码：3325 / 3330

页数：5

共 24 条

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