热处理对激冷Ti-50Ni合金薄带相变和形状记忆行为的影响  

Effect of heat treatment on phase transformation and shape memory behavior of chilled Ti-50Ni shape memory alloy ribbon

作　　者：刘康凯[1] 贺志荣[1] 张永宏[1] 吴佩泽[1] 冯辉[1] 杜雨青 

机构地区：[1]陕西理工大学材料科学与工程学院

出　　处：《金属热处理》2018年第1期199-203,共5页Heat Treatment of Metals

基　　金：陕西省自然科学基金(2012JM6016);陕西省教育厅专项科研计划(2013JK0915);汉中市科技计划(HZGXW1602);陕西理工大学研究生创新基金(SLGYCX1730)

摘　　要：用甩带法制备了Ti-50Ni形状记忆合金薄带,用X射线衍射仪、扫描电镜、透射电镜、示差扫描量热仪和弯曲试验研究了Ti-50Ni合金薄带的相组成、显微组织、相变行为和形状记忆效应。结果表明,铸态和400~600℃退火态Ti-50Ni合金薄带的显微组织形态呈树枝状,由马氏体相B19＇和母相B2组成,加热/冷却过程中发生A→R→M/M→R→A（A-母相,R-R相,M-马氏体）二阶可逆相变。随退火温度升高,Ti-50Ni合金薄带的相组成和显微组织形态变化不大;马氏体逆相变温度TA、R正相变温度TR、R逆相变温度T（Rr）和马氏体相变热滞ΔTM升高,马氏体正相变温度TM下降,R相变热滞ΔTR缓慢降低;M逆相变峰向高温移动,逐渐与R逆相变峰合并。铸态和退火态Ti-50Ni合金薄带皆具有良好的形状记忆效应。The Ti-50Ni shape memory alloy ribbons were fabricated by using melt-spinning.The phase composition,microstructure,transformation behavior and shape memory effect of Ti-50Ni alloy ribbons were studied by meaning of XRD,SEM,TEM,differential scanning calorimetry and bending test.The results show that the microstructure morphology of as-cast and 400-600℃annealed Ti-50Ni alloy ribbons is dendrite.The microstructure composes of martensite phase B19＇and the parent phase B2.The A→R→M/M→R→A（A-parent phase,R-R phase,M-martensite phase）two-stage transformation occurs in as-cast and 400-600℃annealed Ti-50Ni alloy ribbon upon cooling/heating.With increasing annealing temperature,the phase composition and the microstructure morphology of Ti-50Ni alloy ribbons only have a little bit change;but the inverse martensitic transformation temperature TA,R transformation temperature TR,R inverse transformation temperature T（Rr）and the martensitic transformation hysteresisΔTMincrease;the martensitic transformation temperature TMdecreases,and R transformation hysteresisΔTRdecreases slowly;the inverse martensitic transformation peak shifts towards high temperature and merges gradually with inverse R transformation peak.Both as-cast and annealed Ti-50Ni alloy ribbons are of excellent shape memory effect.

关 键 词：Ti-50Ni合金 形状记忆合金薄带 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]