利用热模拟实验机对Ti30Nb13Zr0.5Fe(质量分数,%)医用钛合金在温度700～850 ℃、变形速率10-3～10 s-1范围内进行等温热压缩试验,观察变形后钛合金的显微组织,并根据动力学分析确定合金β相区热变形方程、应力指数n和激活能Q.结果表明: 温度变化不改变σ -ε曲线特征;应变速率对变形行为的影响较大, 为1～10 s-1时,出现流变不稳定性; 为10-2～1 s-1时,组织发生β相再结晶和动态回复;当θ＞800 ℃、＜10-2 s-1时,组织发生β相连续再结晶,导致晶粒粗化;合金β相区变形应力指数n和激活能Q分别为4.5和195 kJ/mol;综合考虑可热加工性和组织细化因素,温度为700～800 ℃、应变速率为10-3～10-1 s-1是良性热加工区域.
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