用示差扫描热分析仪、光学显微镜和拉伸试验研究了不同退火温度(Ta)对Ti-50.8Ni-0.1Zr合金相变行为、显微组织和拉伸行为的影响.结果表明:Ta=400℃时,合金冷却/加热时的相变类型为A→ R→M/M→R→A两阶段可逆相变,而Ta=500℃时,冷却/加热合金正逆转变为A→R→M/M→A,在M逆转变过程中没有出现R相.在Ta为600℃和700℃时,合金冷却/加热时发生A→M/M→A一阶段可逆转变.退火时,合金发生回复、再结晶和晶粒长大3个过程.Ta=350～450 ℃时,为回复阶段,合金组织为纤维状.Ta=500～600℃时,为再结晶阶段,合金组织由纤维状变为无畸变的等轴晶.Ta=650 ～700℃时,为晶粒长大过程,显微组织为不均匀的粗大等轴晶.随着Ta的升高,合金抗拉强度在减小,马氏体相变临界应力先增大后减小,Ta较高时伸长率显著增大,600℃以后随着晶粒尺寸增大,伸长率有所下降.
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