王涛涛,刘恒,苏俊泰,周子一,党阳珂,王永善,李亚鹏,廖仲尼

• 1:陕西理工大学材料科学与工程学院

摘要(Abstract)：

TiNi记忆合金因应力诱发马氏体相变及其逆相变而呈现超弹性，被广泛应用于航空和医疗等领域。然而，随着循环变形的增加，合金的相变应力逐渐减小，而且残余应变逐渐增大，致使其超弹性应用受到很大程度限制。对不同退火温度(350～550℃)处理后的Ti50Ni49Cr1(at%)合金进行加载应变为6%的20次加载和卸载循环测试，研究了退火温度对合金马氏体相变超弹性能的影响。结果表明：不同温度退火后的Ti50Ni49Cr1合金在循环变形过程中的残余应变均随着应变次数的增加而增大，当退火温度由550℃降低至350℃,合金经过20次加载和卸载循环测试后的残余应变由4.9%减小至0.7%;当退火温度由480℃降低至350℃,合金经过20次加载和卸载循环测试后的相变应力由168 MPa增加至604 MPa;其中，350℃退火后的Ti50Ni49Cr1记忆合金兼具高的超弹应力(604 MPa)和低的残余应变(0.7%),由此呈现较高的超弹稳定性；当退火温度由550℃降低至350℃,合金的平均晶粒尺寸由450 nm减小至15 nm。分析认为Ti50Ni49Cr1合金经过低温退火后呈现高的超弹稳定性主要源于较小的晶粒尺寸和较高的屈服强度，使合金在循环变形过程中由于相界面推移和晶粒协调变形产生了较少的位错，由此提高了合金的超弹稳定性。

关键词(KeyWords)： TiNiCr合金;形状记忆合金;热处理温度;超弹性能

Abstract:

Keywords:

基金项目(Foundation): 陕西省科技厅重点研发项目(2024CY-GJHX-31);陕西省科技厅重点研发项目(2024CY2-GJHX-77);陕西省科技厅重点研发项目(2025CY-YBXM-126);; 陕西省教育厅服务地方专项项目(24JC019);; 陕西省秦创原“科学家+工程师”队伍建设(2024QCY-KXJ-013)

作者(Author): 王涛涛,刘恒,苏俊泰,周子一,党阳珂,王永善,李亚鹏,廖仲尼

DOI: 10.13289/j.issn.1009-6264.2025-0350

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