对冷拉拔变形量为60％的钛合金进行700～880℃,1～240 min再结晶退火,利用金相显微镜、X射线衍射仪和透射电镜等手段分析不同状态下的组织演变、织构组成和位错组态.结果表明:冷变形后的Ti6Al4V合金经完全再结晶后α晶粒呈等轴状,β相在α相周围以条状沿α晶界析出或以小晶粒形式存在.计算表明,经60％冷变形量的钛合金再结晶激活能为107 kJ/mol,较相同变形量的纯钛再结晶激活能高约50％.钛合金的再结晶分为回复、形核和晶核长大阶段,包括位错胞向亚晶转变、回复亚晶通过合并或长大形核、形核诱导高角度晶界形成而长大成新晶粒.经过冷拉拔后的丝材,存在着较强的＜10-10＞织构,而在再结晶过程中,沿＜10-10＞方向上产生的回复亚晶优先形核并长大形成新的晶粒.这导致在初始再结晶阶段,再结晶织构与冷变形织构取向一致,而在晶粒长大阶段,原先取向不利的晶粒吞并周围小晶粒长大,形成新的织构组元使原来的织构被弱化.
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