用示差扫描量热仪、拉伸实验和应力-应变循环实验系统研究了退火温度、变形温度以及热循环和室温应力-应变循环对Ti49.4Ni50.6超弹性(SE)弹簧的相变和形变特性的影响冷加工加中温退火态Ti49.4Ni50.6合金冷却()加热时的相变类型为母相B2()R相()马氏体B19'.随退火温度升高,马氏体转变温度升高,R相转变温度降低623-773 K退火态Ti49.4Ni50.6弹簧室温下可获得SE特性,随变形温度升高,SE弹簧刚度增加;当退火温度超过823 K后,SE特性变差.热循环时SE弹簧的切变量取值越小,其应变恢复率越高预循环训练可增强SE的稳定性.
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