热处理对Ti-18Nb-10Zr合金微观组织和超弹性的影响

研究了固溶、固溶时效、短时退火对Ti-18Nb-10Zr(at%)合金微观组织和超弹性的影响。采用室温拉伸测试了合金超弹性;借助X射线衍射（XRD）、电子背散射衍射（EBSD）、透射电子显微镜（TEM）对微观组织、相变行为进行了观察与分析。结果表明,冷轧态Ti-18Nb-10Zr合金,800 ℃固溶后,发生了完全再结晶,由β相和细小的无热ω相组成,回复应变约为2.65%;再在350 ℃时效后,由于等温ω相尺寸和体积分数显著增加,急剧降低了合金Ms,应力-应变曲线未呈现超弹性;650 ℃短时退火后,合金基本完成再结晶,由单一的β相组成,平均晶粒尺寸约为10 μm,晶粒细化改善了合金超弹性,回复应变约为2.86%。     

Ti-26Nb-4Zr合金冷轧板材的织构和力学性能

采用X射线衍射和室温拉伸方法研究了冷轧变形和固溶处理对Ti-26Nb-4Zr合金板材的织构和力学性能的影响.研究发现,50%冷轧时形成了{001}〈uvw〉织构,随着冷变形量的增加,逐渐形成了{121}〈1 rolling texture appears after 50% cold rolling. With increasing cold rolling reduction, a {121}〈111> and {001} <110> mixed texture forms finally. The 〈110> direction turns from perpendicular to parallel to the rolling direction. After solution treatment at 800°, a {111} <110> recrystallization texture forms and its intensity increases with cold rolling reduction, while the (110) keeps parallel to the rolling direction. Due to work-hardening and refined crystal strengthening, the strength of the cold rolled plates increases while the plasticity decreases with the increase of cold rolling reduction. After solution treatment, the plasticity increases markedly because of the occurrence of recrystallization.