新型Ti-20zr-49.7pd高温形状记忆合金,易孪晶和析出强化

H. Tobe, Shunsuke Kojima, E. Sato
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引用次数: 1

摘要

在形状记忆效应中,希望开发出马氏体相变起始温度(Ms)高于100℃、可恢复应变约为4‐6%的高温形状记忆合金。后一种性能是在马氏体易失孪的低变取向应力和析出强化的高塑性变形应力下实现的。我们之前已经证明了通过控制马氏体的晶体结构可以促进Ti - zr - Ni - pd四元合金体系的双晶化,并提出Ti -(15‐20)Zr-49.7Pd (at.%)和周围的含Ni成分是候选成分。本研究对Ti-20Zr-49.7Pd合金进行时效温度优化,获得了优异的形状记忆效果,Ms在130℃以上,重定向应力在200 MPa左右,塑性变形应力在1800 MPa左右,恢复应变高达4.5%。另一方面,溶质原子的短程有序发生在刚好高于反转变温度的地方,并降低了Ms。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Novel Ti–20zr–49.7pd High Temperature Shape Memory Alloy with Facilitated Detwinning and Precipitation Strengthening
It is desirable to develop high temperature shape memory alloys with a martensitic transformation start temperature (Ms) above 100°C and a recoverable strain of about 4‐6% in the shape memory effect. The latter property is achieved with low variant reorientation stress due to easy detwinning of martensite and high plastic deformation stress due to precipitation strengthening. We have previously demonstrated the facilitation of detwinning for Ti–Zr–Ni–Pd quaternary alloy systems through controlling the crystal structure of martensite, and proposed that Ti–(15‐20)Zr–49.7Pd (at.%) and surrounding Ni‐containing compositions are candidates. In this study, aging temperature was optimized for a Ti–20Zr–49.7Pd alloy, and an excellent shape memory effect with Ms above 130°C, low reorientation stress around 200 MPa, high plastic deformation stress around 1800 MPa, and large recovery strain of 4.5% was achieved. On the other hand, short‐range ordering of solute atoms occurs just above the reverse transformation temperature and decreases Ms.
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