The effect of stress on soft modes for the phase transformation in a Ti-Ni alloy
The effect of stress on soft modes for the phase transformation in a Ti-Ni alloy
复制标题
应力对 Ti-Ni 合金相变软模式的影响
DOI：
10.1080/01418619108213902
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
T. Ko
中科院分区：
文献类型：
--
作者：
D. Li;X. Wu;T. Ko
声子模的软化对应力敏感。富Ni Ti-Ni合金中Ti_（11）Ni_（14）沉淀形成的内应力和等原子Ti-Ni合金中热循环引入的内应力对声子模的软化有很强的影响，特别是对与R相变密切相关的极化矢量声子的软化。Ti-Ni合金时效和热循环的主要作用是R相数量的增加，从而显著提高了材料的形状记忆效应和伪弹性。压应力对R相变的负面影响已被实验证实。
Abstract The softening of phonon modes is sensitive to stress. Both the internal tensile stress formed by Ti11Ni14 precipitates in Ni-rich Ti-Ni alloy and the internal stress introduced by thermal cycling in equiatomic Ti-Ni alloy have strong effects on the softening of phonon modes, especially on phonons with polarization vectors which are closely related to the R-phase transformation. The increase in the amount of R phase is the main effect of ageing and thermal cycling Ti-Ni alloy; this results in remarkable improvement in the shape memory effect and the pseudo-elasticity of the material. The negative effect of a compressive stress on the R-phase transformation has been experimentally confirmed.