退火处理对TiNi形状记忆合金力学性能与相变特性的影响

doi:10.13251/j.issn.0254-6051.2025.06.030

金属热处理 ›› 2025, Vol. 50 ›› Issue (6): 196-201.DOI: 10.13251/j.issn.0254-6051.2025.06.030

退火处理对TiNi形状记忆合金力学性能与相变特性的影响

汤金, 孔永华

东华大学机械工程学院,上海 201620

收稿日期:2024-12-21 修回日期:2025-03-08 出版日期:2025-06-25 发布日期:2025-07-08
通讯作者: 孔永华,副教授,博士,E-mail:yhkong@dhu.edu.cn
作者简介:汤金(2001—),女,硕士,主要研究方向为镍钛合金的组织与性能,E-mail:2061514032@qq.com。

Effect of annealing on mechanical properties and phase transformation characteristics of TiNi shape memory alloy

Tang Jin, Kong Yonghua

College of Mechanical Engineering,Donghua University, Shanghai 201620, China

Received:2024-12-21 Revised:2025-03-08 Online:2025-06-25 Published:2025-07-08

摘要/Abstract

摘要： 探索了不同退火温度下TiNi形状记忆合金的显微组织、力学性能以及相变行为的演变规律。结果表明,在350~850 ℃范围内进行退火处理时,随着退火温度的升高,TiNi合金的组织由原始冷轧态的拉长破碎形态转变为均匀的晶粒结构,且晶粒尺寸逐渐增大。抗拉强度和显微硬度均呈现出先上升后下降的变化趋势,450 ℃退火时强度和硬度最大,分别为1498 MPa、325.88 HV0.5。应力诱发马氏体相变的临界应力呈现出先下降后上升的变化趋势,550 ℃退火时临界应力最小,为121 MPa,850 ℃退火时临界应力最大,为421 MPa。相变类型均为一步可逆的马氏体相变,相变温度表现为先上升后下降。450 ℃退火时相变温度最高,马氏体逆相变结束温度(Af)为47.45 ℃、Ms为17.73 ℃,850 ℃退火时相变温度最低,Af为18.89 ℃,Ms为-20.68 ℃。

关键词: 退火处理, TiNi合金, 显微组织, 力学性能

Abstract: Evolution of microstructure, mechanical properties, and phase transformation behavior of TiNi shape memory alloy under different annealing temperatures was explored. The results show that when annealed within the temperature range of 350-850 ℃, with the increase of annealing temperature, the microstructure of the TiNi alloy changes from the elongated and broken form of the original cold-rolled state to a uniform grain structure, and the grain size gradually increases. The tensile strength and microhardness exhibit an initial increase followed by a decrease, reaching peak values of 1498 MPa and 325.88 HV0.5 respectively after annealing at 450 ℃. The critical stress for stress-induced martensitic transformation first decreases and then increases, showing minimum value of 121 MPa after annealing at 550 ℃ and maximum value of 421 MPa after annealing at 850 ℃ respectively. The phase transformation consistently maintains a single-step reversible martensitic transformation behavior. The phase transformation temperature displays a trend of first rising and then falling, with the highest values observed after annealing at 450 ℃ (Af=47.45 ℃, Ms=17.73 ℃) and the lowest after annealing at 850 ℃ (Af=18.89 ℃, Ms=-20.68 ℃).

Key words: annealing treatment, TiNi alloy, microstructure, mechanical properties

中图分类号:

TG156.1

汤金, 孔永华. 退火处理对TiNi形状记忆合金力学性能与相变特性的影响[J]. 金属热处理, 2025, 50(6): 196-201.

Tang Jin, Kong Yonghua. Effect of annealing on mechanical properties and phase transformation characteristics of TiNi shape memory alloy[J]. Heat Treatment of Metals, 2025, 50(6): 196-201.

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退火处理对TiNi形状记忆合金力学性能与相变特性的影响

Effect of annealing on mechanical properties and phase transformation characteristics of TiNi shape memory alloy

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