The influence of Ni4Ti3 precipitates orientation on two-way shape memory effect in a Ni-rich NiTi alloy
The influence of Ni4Ti3 precipitates orientation on two-way shape memory effect in a Ni-rich NiTi alloy
复制标题
DOI：
10.1016/j.jallcom.2009.05.084
复制
发表时间：
2009-10
影响因子：
6.2
通讯作者：
M. Shakeri;J. Khalil-Allafi;V. Abbasi-Chianeh;A. Ghabchi
中科院分区：
文献类型：
--
作者：
M. Shakeri;J. Khalil-Allafi;V. Abbasi-Chianeh;A. Ghabchi
本文研究了富Ni NiTi合金经形变热循环处理后产生的双向形状记忆效应（two-way shape memory effect，TWSME），研究了亚稳相和透镜状相Ni 4 Ti 3的取向作为控制参数，在不同时效温度、时效时间和外加应变下对TWSME的影响。结果表明，450°C是实现最高恢复率的最佳老化温度。在450°C时效2.5h，应变量增加到3.38%，回复率提高。结果表明，时效过程中形成的Ni_4Ti_3析出相的特殊变体和热机械循环处理时施加的应变的增加，都能提高TWSME。
In this present work two-way shape memory effect (TWSME) induced by thermomechanical cycling treatments in a Ni-rich NiTi alloy was investigated.Effect of orientation of metastable and lenticular Ni4Ti3precipitates as a governing parameter in different aging temperatures and time as well as applied strain on TWSME were studied. The results indicate that 450°C is the optimum aging temperature to achieve highest recovery rate. The increasing of applied strain up to 3.38% and aging time up to 2.5h at 450°C improves the recovery rate. It has been concluded that formation of especial variants of Ni4Ti3precipitates during aging and increasing of applied strain on thermomechanical cycling treatments could enhance the TWSME.