退火温度对Ni_(47)Ti_(44)Nb_9冷拉丝及热拉丝力学性能和记忆性能的影响  

Effect of Annealing Temperature on Mechanical Properties and Shape Memory Properties of Ni_(47)Ti_(44)Nb_9 Cold Drawn Wires and Hot Drawn Wires

作　　者：冯昭伟[1] 王江波[1] 米绪军[2] 袁志山[1] 缪卫东[1] 周瑾[1] 

机构地区：[1]北京有色金属研究总院有研亿金新材料股份有限公司,北京102200 [2]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088

出　　处：《稀有金属材料与工程》2013年第10期2174-2178,共5页Rare Metal Materials and Engineering

摘　　要：使用差式扫描量热仪和电子万能试验机,研究了Ni47Ti44Nb9冷拉丝及热拉丝的室温力学性能、相变温度、恢复应变。结果表明,随退火温度升高,Ni47Ti44Nb9冷拉丝、热拉丝的抗拉强度、屈服强度降低,延伸率升高,马氏体相变温度升高,相变热增加;预应变后记忆恢复应变减小,第一次加热的相变温度升高,相变温度间隔增加。适当热机械处理会提高Ni47Ti44Nb9丝材的记忆性能,40%冷拉丝不同温度退火时,记忆恢复应变优于热拉丝。Properties of Ni47Ti44Nb9 alloy cold drawn wires and hot drawn wires were studied by means of the differential scanning calorimetry measurement and the tensile test.With increasing annealing temperature,the tensile strength and the yield strength decrease,while the elongation,the martensite transformation temperature and the transformation heat increase.The recovery strain keeps decreasing,and the transformation temperature,the transformation intervals increase with the increment of annealing temperature.Proper heat-mechanical treatment can promote the shape memory effect,and the recovery strain of 40％ cold drawn wire is better than that of the hot drawn wires.

关 键 词：Ni47Ti44Nb9形状记忆合金 退火温度 力学性能 相变温度 恢复应变 

分 类 号：TG139.6[一般工业技术—材料科学与工程]