时效处理对Ni-Ti-Hf-Nb高温形状记忆合金相变热稳定性的影响  

Effect of aging treatment on phase transformation thermal stability of Ni-Ti-Hf-Nb high temperature shape memory alloy

作　　者：赵国简 李昊原 杨杰 徐瑞瑶 黄兴民[1,2] 金明江[3] Zhao Guojian;Li Haoyuan;Yang Jie;Xu Ruiyao;Huang Xingmin;Jin Mingjiang(Advanced Materials Key Laboratory of Ministry of Education,Southwest Jiaotong University,Chengdu Sichuan 610031,China;School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]西南交通大学先进材料教育部重点实验室,四川成都610031 [2]西南交通大学材料科学与工程学院,四川成都610031 [3]上海交通大学材料科学与工程学院,上海200240

出　　处：《金属热处理》2023年第7期54-60,共7页Heat Treatment of Metals

基　　金：四川省科技计划(2020YFH0102)。

摘　　要：结合差示扫描量热、显微硬度和能谱分析,研究了时效工艺对(Ni_(50)Ti_(35)Hf_(15))_(90)Nb_(10)高温形状记忆合金的马氏体相变行为和热循环稳定性的影响。结果表明,在450℃时效处理,随着时效时间延长,试验合金的奥氏体相变峰值温度(Ap)和马氏体相变峰值温度(Mp)均先升高后降低;在550、650℃时效处理,随着时效时间延长,奥氏体相变峰值温度(Ap)和马氏体相变峰值温度(Mp)均逐渐下降,且相较550℃时效,650℃时效时相变温度下降得更显著。550℃时效1 h的试样具有最佳的热循环稳定性,经10次热循环后的ΔAp和ΔMp分别为1.5℃和5.8℃。Effect of aging treatment on martensitic phase transformation behavior and thermal cycling stability of(Ni_(50)Ti_(35)Hf_(15))_(90)Nb_(10) high temperature shape memory alloy were investigated by combining differential scanning calorimetry,microhardness,and energy spectrum analysis.The results show that during aging treatment at 450 ℃,both the austenite phase transformation peak temperature(Ap) and martensite phase transformation peak temperature(Mp) of the experimental alloy increase first and then decrease with the extension of aging time.During aging treatment at 550 ℃ and 650 ℃,as the aging time increases,both the Ap and Mp gradually decrease.The phase transformation temperatures decrease more significantly during aging at 650 ℃ compared to aging at 550 ℃.The specimen aged at 550 ℃ for 1 h exhibits the best thermal cycling stability,with ΔAp and ΔMp of 1.5 ℃ and 5.8 ℃,respectively,after 10 thermal cycles.

关 键 词：高温形状记忆合金 时效处理 热循环稳定性 热分析 

分 类 号：TG166.5[金属学及工艺—热处理]