为了研究TA15(Ti-6Al-2Zr-1Mo-1V)钛合金的动态热变形行为,采用圆柱试样在Gleeble-1500热模拟机上进行了恒应变速率压缩变形试验(变形温度550～1000℃,变形速率0.01～1 s-1),计算了材料的变形激活能Q并观察了热变形组织.结果表明,材料的流动应力随着变形温度的升高而降低,随应变速率的提高而增大.材料的流变行为表现为加工硬化(550～600℃)、动态再结晶(650～900℃)、动态回复(950～1000℃)三种类型.材料在(α+β)相区的热变形激活能为517kJ/mol,β相区为205kJ/mol.流动应力曲线、变形激活能以及变形组织分析表明,在α+β相区动态再结晶是材料的主要软化机制,而在β相区软化机制则以动态回复为主.随着变形速率的降低,在(α+β)双相区动态再结晶进行得更加充分,而在β相区则动态回复的亚晶趋于长大.
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