冷轧Ti-50.8Ni-0.4V形状记忆合金相变和超弹性研究  

Study on Phase Transformation and Superelasticity of Cold Rolled Ti-50.8Ni-0.4V Shape Memory Alloy

作　　者：石海洋 张青来[1] 韩伟东 柏秋生 刘志强 SHI Haiyang;ZHANG Qinglai;HAN Weidong;BAI Qiusheng;LIU Zhiqiang(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China;Baoji Boxin Metal Materials Ltd.,Baoji 721013,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]宝鸡市博信金属材料有限公司,陕西宝鸡721013

出　　处：《热加工工艺》2024年第17期101-106,共6页Hot Working Technology

摘　　要：利用金相显微镜、示差量热分析法和拉伸试验对比研究了冷轧和退火态Ti-50.8Ni-0.4V合金的相变及超弹性。结果表明:退火处理对冷轧合金的相变和超弹性(SE)特性具有显著的影响。具有大量位错塞积的冷轧态合金表现为线性SE,而退火态合金呈非线性SE,350~550℃退火态合金表现为两步相变(A→R→M/M→R→A),形状回复率Rr达到96%,具有优异SE特性。600℃和650℃退火态合金发生完全再结晶,随温度的升高R相逐渐消失,其相变分别为(A→R→M)/(M→A)和(A→M)/(M→A),形状回复率Rr值<29%,其SE特性明显变差。The phase transformation and superelasticity of cold rolled and annealed Ti-50.8Ni-0.4Valloys were studied by metallographic microscope,differential calorimetric analysis and tensile test.The results show that annealing treatment has a significant effect on the phase transformation and superelastic(SE)properties of cold rolled alloys.The cold rolled alloy with a large number of dislocation plug product is linear SE,and the annealed alloy is nonlinear SE.The annealed alloy at 350℃shows two-step phase transformation(A→R→M/M→R→A).The shape recovery rate Rr is 96%,which has excellent SE characteristics.The annealed alloys at 600℃and 650℃are completely recrystallized and the R phase disappears with the increase of temperature.The phase transition is(A→R→M)/(M→A)and(A→M)/(M→A),respectively.The shape recovery rate Rr is less than 29%,and the SE characteristics become worse obviously.

关 键 词：Ti-50.8Ni-0.4V合金 冷轧 力学性能 超弹性 相变 退火 

分 类 号：TG156.2[金属学及工艺—热处理] TG139.6[金属学及工艺—金属学]