李亚鹏,武泽园,张会,廖仲尼,王涛涛

• 1:陕西理工大学材料科学与工程学院

摘要(Abstract)：

采用拉拔变形及低温退火获得了平均晶粒尺寸为15 nm的Ti_(50)Ni_(48)Fe_2(原子分数)记忆合金丝材，通过拉伸实验机研究了拉伸应变为6%及20次循环变形对纳米晶TiNiFe记忆合金应力诱发马氏体相变超弹性的影响。结果表明：当循环变形次数由1次增加至20次，纳米晶TiNiFe合金马氏体相变的超弹应力由871 MPa减小至723 MPa,残余应变由0.53%增加至0.73%。本文中的纳米晶TiNiFe合金在循环变形后呈现出高超弹应力和小残余应变，明显优于已经报道的TiNi记忆合金。这主要是由于纳米晶TiNiFe合金中高密度晶界产生的细晶强化和Fe元素产生的固溶强化，由此抑制了合金中位错的产生从而提高了马氏体相变的超弹稳定性。

关键词(KeyWords)： 记忆合金;NiTiFe;马氏体相变;超弹性;循环变形

Abstract:

Keywords:

基金项目(Foundation): 陕西省科技厅重点研发项目(2024GX-YBXM-361);陕西省科技厅重点研发项目(2024GX-YBXM-376);; 陕西省自然科学基金项目(2024JC-YBQN-0366)

作者(Author): 李亚鹏,武泽园,张会,廖仲尼,王涛涛

DOI: 10.13289/j.issn.1009-6264.2024-0204

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