用示差扫描量热仪和拉伸试验研究了添加Cr对形变退火态Ti-Ni形状记忆合金相变和低温形变特性的影响.结果表明,添加微量Cr后,Ti-Ni合金的R、马氏体(M)相变温度θR和θM大幅度降低,M相变热滞△θM增加,应力-应变曲线的平台应力σM显著提高,超弹性(SE)改善,塑性变差.添加微量Cr后,Ti-Ni合金的低温SE特性大幅改善.室温下,Ti-50.8Ni合金呈现形状记忆效应(SME)+SE,而Ti-50.8Ni-0.3Cr合金则呈现SE.退火温度也显著影响Ti-Ni合金的低温形变特性.在10℃变形时,400～500℃退火态Ti-50.8Ni合金呈现SME,550～650℃退火态Ti-50.8Ni合金呈现SME+ SE,而400～650℃退火态Ti-50.SNi-0.3Cr合金则持续呈现SE.
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