张坤刚,贺志荣,叶俊杰,杜雨青

• 1:陕西理工大学材料科学与工程学院

摘要(Abstract)：

用X射线衍射仪、光学显微镜和拉伸试验等研究了退火温度(T_a)对Ti-50Ni和Ti-45Ni-5Cu形状记忆合金丝相组成、显微组织和拉伸性能的影响。结果表明,退火态Ti-50Ni和Ti-45Ni-5Cu合金丝室温组成相均为单斜结构的马氏体B19′和CsCl型结构的母相B2。350～550℃退火态Ti-50Ni和Ti-45Ni-5Cu合金丝皆处于回复阶段,组织呈现纤维状,600～700℃退火态合金丝处于晶粒长大阶段,组织呈等轴状;两种合金的再结晶温度均在550～600℃之间。Ti-50Ni和Ti-45Ni-5Cu合金丝的抗拉强度(R_m)和马氏体再取向平台长度(L_M)相近,Ti-50Ni合金丝的马氏体再取向应力(σ_M)和伸长率(A)大于Ti-45Ni-5Cu合金丝。随T_a升高,两种合金丝的R_m和L_M下降,A升高,σ_M先下降后上升,Ti-50Ni合金丝σ_M的最小值102.8 MPa在450～500℃退火态合金丝中取得,Ti-45Ni-5Cu合金丝σ_M的最小值63.3 MPa在400℃退火态合金丝中取得。

关键词(KeyWords)： Ti-50Ni合金丝;Ti-45Ni-5Cu合金丝;形状记忆合金;退火;显微组织;拉伸性能

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2016YFE0111400);; 陕西理工大学研究生创新基金(SLGYCX2122)

作者(Author): 张坤刚,贺志荣,叶俊杰,杜雨青

DOI: 10.13289/j.issn.1009-6264.2020-0459

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