用拉伸试验和透射电子显微镜研究了固溶时效处理对Ti-50.8Ni-0.3Cr形状记忆合金拉伸性能和显微组织的影响.800℃固溶淬火态合金的塑性优于时效态.随时效时间fag延长,300和400℃时效态合金的抗拉强度Rm300和Rm400先急剧增大后趋于稳定,且Rm300<Rm400,延伸率A300和A400先急剧减小后趋于稳定;500℃时效后,Rm500先急剧减小后趋于稳定,A500先急剧增大后趋于稳定.随fag延长,300和400℃时效态合金的应力诱发马氏体临界应力RM300和RM400均逐渐减小,而RM500则先减小后增加再减小,极大值在fag=5~10 h时取得.此外,随fag延长,300℃对效态合金的Ti3Ni4析出相呈细小颗粒状弥散分布;400℃时效态合金的Ti3Ni4析出相由颗粒状演变成透镜状;500℃时效态合金的Ti3Ni4析出相发生由透镜状向针状再向粗片状演变.时效温度对Ti3Ni4析出相形态的影响效果比时效时间显著.
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