利用Thermecmaster-Z型热模拟试验机在β相区对铸态TB6钛合金进行了热压缩试验,并对其动态再结晶行为进行了研究.结果表明,合金在β热变形过程中主要存在两类形核位置:原始β晶界附近及β晶粒内部,相应地存在两类动态再结晶机制:不连续动态再结晶和连续动态再结晶.在较高应变速率(≥0.01 s-1)时,以不连续动态再结晶机制为主,但动态再结晶发生的程度较低,不能通过此机制使组织获得明显细化;在低应变速率(≤0.001 s-1)和高变形温度(≥950℃)时,以连续动态再结晶机制为主.此时,合金动态再结晶晶粒直接由亚晶转变而成,组织均匀、细小.
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