LI Yan WU Yigui Luoyang Institute of Technology
,
Luoyang
,
ChinaHASHIMOTO Hatsujiro Okayama University of Science
,
Japan
金属学报(英文版)
The reversible transformation between matrix and martensite in Ni-Ti shape memory alloys has been dynamically observed under TEM.The orientation relation between martensite and austenite as well as the structural change near the transition temperature has been also studied with the help of HREM SADP.The results show that the orientation relation between martensite and austenite is[11]_A//[10]_M,[110]_A//[001]_M,(110)_A//(001)_M and the angle between(110)_A and(010)_M is about 6.5°.The crystal defects of martensite are found to be twin and stacking fault,and the twin plane as(100).
关键词:
Ni-Ti alloy
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null
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null
杨胜男
,
杨素媛
,
张晓
,
吴琼
稀有金属材料与工程
利用INSTRON5985电子材料万能试验机和分离式Hopkinson压杆冲击加载装置对Ni-Ti形状记忆合金棒材进行准静态和动态力学性能研究,并通过XRD、OM、SEM等微观分析方法对不同状态下的微观组织结构进行分析.结果表明:Ni-Ti合金原始组织存在B2奥氏体相、B19’马氏体相、Ni4Ti3相,晶粒细小且呈等轴分布;准静态压缩和动态压缩均发生应力诱发马氏体相变,但动态压缩应力-应变曲线无屈服平台出现,存在应变率硬化效应;在一定的应变率范围内,随着应变率的提高,晶粒内部平行条纹状组织增多,应力诱发马氏体相变程度增大.
关键词:
Ni-Ti合金
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应力诱发马氏体相变
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高应变率
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微观组织
