Nanostructured TiNi-based shape memory alloys processed by severe plastic deformation
Nanostructured TiNi-based shape memory alloys processed by severe plastic deformation
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DOI：
10.1016/j.msea.2005.08.071
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发表时间：
2005-11-25
期刊：
影响因子：
6.4
通讯作者：
Zhu, YT
中科院分区：
文献类型：
--
作者：
Pushin, VG;Stolyarov, VV;Zhu, YT
本文介绍了利用高压扭转、等径角挤压和多步SPD变形（SPD加冷轧或拉拔）合成的纳米镍基形状记忆合金的工艺、组织和性能。结果表明，SPD处理没有改变合金的相变顺序，但改变了马氏体的形貌。此外，我们发现通过在这些合金中形成纳米结构，力学性能和形状记忆性能得到了改善；SPD加工具有较高的恢复应力（高达1.5 GPa）和较高的最大反向应变（高达10%）的形状记忆，这在各种实际应用中都是理想的。(c) 2005年Elsevier B.V.出版
We present the processing, microstructure and properties of nanostructured TiNi-based shape-memory alloys synthesized by severe plastic deformation (SPD), including high-pressure torsion, equal-channel angular pressing, and multi-step SPD deformation (SPD plus cold rolling or drawing). It was found that the SPD processing did not alter the phase transformation sequence of the alloys but changed the morphology of the martensite. Also, we found that the mechanical and shape memory properties were improved by forming nanostructures in these alloys; SPD processing rendered a higher recovery stress (up to 1.5 GPa) and a higher maximum reverse strain (up to 10%) of shape memory, which are desirable in various practical applications. (c) 2005 Published by Elsevier B.V.