用光学显微镜和拉伸试验研究了退火温度(Ta)对Ti-50.8Ni-0.3Cr合金显微组织和拉伸行为的影响.结果表明,合金原始态为拉拔纤维组织,退火时发生回复与再结晶.Ta=350～500℃时,为回复阶段,组织呈纤维状.Ta=550～590℃时,为再结晶阶段,纤维组织逐渐变成无畸变等轴晶粒,再结晶温度在570℃左右.Ta=600～800℃时,为晶粒长大阶段,显微组织呈粗大不均匀等轴晶.Ta对合金在低温(8℃)下的拉伸行为有显著影响,随Ta升高,应力诱发马氏体相变临界应力先降低后升高；350～500℃退火态合金的加工硬化能力和抗拉强度大于550～700℃退火态合金,而后者的延伸率则显著大于前者.当Ta大于650℃后合金的延伸率因晶粒粗化而减小.
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