Ti-50Ni激冷合金薄带的组织、相变和形状记忆行为  

Microstructure,transformation and shape memory behavior of Ti-50Ni chilled alloy ribbon

作　　者：刘康凯[1] 贺志荣[1] 吴佩泽[1] 冯辉[1] 杜雨青 LIU Kang-kai HE Zhi-rong WU Pei-ze FENG Hui DU Yu-qing(School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, Chin)

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723000

出　　处：《陕西理工大学学报（自然科学版）》2017年第5期6-10,17,共6页Journal of Shaanxi University of Technology:Natural Science Edition

基　　金：陕西省重大科技创新项目(2017ZKC04-84);陕西理工大学研究生创新基金资助项目(SLGYCX1730)

摘　　要：用熔体激冷法制备了Ti-50Ni合金薄带,用扫描电子显微镜、透射电子显微镜、X射线衍射仪、示差扫描量热仪和弯曲试验研究了Ti-50Ni激冷合金薄带的显微组织、相组成、相变和形状记忆行为。结果表明,铸态和退火态Ti-50Ni激冷合金薄带都具有良好的形状记忆效应,其显微组织呈树枝状,由马氏体和母相组成,冷却时都发生A→R→M二阶段相变,加热时铸态和400~500℃退火态激冷合金薄带发生M→R→A二阶段相变,550~600℃退火态则发生M→A一阶段相变。随退火温度升高,马氏体逆相变温度T_A、R正相变温度T_R、R逆相变温度T_(Rr)和马氏体相变热滞△T_M升高,马氏体正相变温度T_M和R相变热滞△T_R降低。The Ti-50Ni shape memory alloy ribbons were fabricated by melt-spinning. The microstruc- ture, phase composition, transformation and shape memory behavior of Ti-50Ni chilled alloy ribbons were studied by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, differential scanning calorimetry, and bending test. The results are as follows. Both of asphalt and annealed Ti-50Ni chilled alloy ribbon are of excellent shape memory effect. The microstructure morphology is dendrite and composes of martensite and parent phase. The A→R→M two-stage transformation occurs upon cooling. The M→ R→A two-stage transformation occurs in asphalt and annealing at 400-500℃ alloy ribbons, and the M-→A one-stage transformation occurs in annealing at 550 -600℃ alloy ribbons upon heating. With increasing annealing temperature, the inverse martensitic transformation temperature TA, R phase transition temperature TR, R inverse transformation temperature TRr and martensitic transformation hysteresis △TM increases; the martensitic transformation temperature TM and the R transformation hysteresis △TR decreases.

关 键 词：Ti-50Ni合金 形状记忆合金 熔体激冷 薄带 显微组织 相变 形状记忆效应 

分 类 号：TG113.25[金属学及工艺—物理冶金]