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低Nb含量Ni-Ti-Nb形状记忆合金的组织及相变特征
引用本文:杨亚卓,赵新青,孟令杰,杨尚林,徐惠彬. 低Nb含量Ni-Ti-Nb形状记忆合金的组织及相变特征[J]. 金属学报, 2005, 41(6): 627-632
作者姓名:杨亚卓  赵新青  孟令杰  杨尚林  徐惠彬
作者单位:1. 北京航空航天大学材料科学与工程学院,北京,100083;哈尔滨工程大学机电学院,哈尔滨,150001
2. 北京航空航天大学材料科学与工程学院,北京,100083
3. 哈尔滨工程大学机电学院,哈尔滨,150001
基金项目:国家自然科学基金资助项目50471002
摘    要:系统研究了低Nb含量(原子分数为4.5%)的Ni-Ti-Nb形状记忆合金的微观组织形态和相变特征以及预变形对相变滞后的影响.结果表明,Ni/Ti比的微小变化对合金的微观组织产生重要影响,从而影响合金的相变特征.低Nb含量的Ni-Ti-Nb形状记忆合金仍然具有宽滞后效应.研究了在相同温度下分别处于马氏体和奥氏体状态时低Nb合金的变形行为,并结合热弹性马氏体相变动力学作了相关解释.

关 键 词:形状记忆合金 Ni-Ti-Nb 马氏体 相变滞后
文章编号:0412-1961(2005)06-0627-06
收稿时间:2004-09-18
修稿时间:2004-12-20

Microstructure and Transformation Behavior of Ni-Ti-Nb Shape Memory Alloys with Low Nb Content
YANG Yazhuo,ZHAO Xinqing,Meng Lingjie,YANG Shanglin,Xu Huibin. Microstructure and Transformation Behavior of Ni-Ti-Nb Shape Memory Alloys with Low Nb Content[J]. Acta Metallurgica Sinica, 2005, 41(6): 627-632
Authors:YANG Yazhuo  ZHAO Xinqing  Meng Lingjie  YANG Shanglin  Xu Huibin
Abstract:The structure evolution and phase transformation behavior of Ni-Ti-Nb shape memory alloys with 4.5%Nb (atomic fraction) were studied systematically. It is found that the structure evolution as well as the phase transformation characteristics of the alloys is very sensitive to the ratio of the atomic fractions of Ni and Ti. After appropriate predeformation, a wide hysteresis was observed in such low Nb alloys. The difference of the mechanical behaviors of the alloys with austenite or marten-site states was investigated at the same temperature, and explained by the kinetics of thermoelastic martensitic transformation.
Keywords:shape memory alloy  Ni-Ti-Nb  martensite  hysteresis
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