王涛涛,武泽园,李亚鹏,廖仲尼,王永善

• 1:陕西理工大学材料科学与工程学院

摘要(Abstract)：

通过对Ni_(50.2)Ti_(49.8)(at%)记忆合金丝材进行大变形冷拔和低温退火获得了平均晶粒尺寸为15 nm的纳米晶NiTi记忆合金丝材样品，然后采用应变量为6%的20次拉伸循环实验研究了纳米晶NiTi合金力致R→B19′相变的超弹稳定性。结果表明：纳米晶NiTi合金在经过20次拉伸循环变形后，其超弹应力为734 MPa,超弹应力的减小率为16%,残余应变为0.61%,此综合超弹性能优于以往粗晶NiTi记忆合金。这主要源于纳米晶NiTi记忆合金中细晶强化显著提高了合金屈服强度，因此降低合金马氏体相变过程中塑性变形，可使纳米晶NiTi记忆合金呈现高的超弹稳定性。

关键词(KeyWords)： 纳米晶;NiTi;记忆合金;R相;超弹稳定性

Abstract:

Keywords:

基金项目(Foundation): 陕西省自然科学基础研究计划一般项目(2024JC-YBQN-0366);; 陕西理工大学人才启动科研基金资助项目(209020369)

作者(Author): 王涛涛,武泽园,李亚鹏,廖仲尼,王永善

DOI: 10.13289/j.issn.1009-6264.2023-0399

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