TiAl合金的物理本构模型与加工图

来源期刊:中国有色金属学报2020年第6期

论文作者:任书杰 王克鲁 鲁世强 刘大博 田野 罗飞

文章页码:1289 - 1297

关键词:TiAl合金;物理本构模型;加工图;流变应力

Key words:TiAl alloy; physical constitutive model; processing map; flow stress

摘    要:借助热模拟试验机研究TiAl合金在变形温度为1273~1523 K、应变速率为 0.001~1 s-1和变形程度为50%条件下的热变形行为;分析流变应力曲线特征,构建基于应变补偿的物理本构模型;考虑TiAl合金的弹性模量和自扩散系数与温度的关系,基于动态材料模型建立该合金的加工图,确立合适的热加工工艺参数。结果表明:TiAl合金具有正应变速率敏感性和负温度敏感性,流变应力曲线主要表现为动态再结晶软化机制;所建立的物理本构模型的预测值与实验值具有较好的吻合度;根据加工图的分析,该合金适宜的变形参数范围为1360~1523 K、0.001~0.02 s-1

Abstract: Hot deformation behavior of TiAl alloy was studied at the temperature range of 1273-1523 K, strain rate range of 0.001-1 s-1 and maximum deformation degree of 50% with thermal simulator. The characteristics of the flow stress curve were analyzed. The physical constitutive model based on strain compensation was constructed, which took into account the relationship between elastic modulus and self-diffusion coefficient and temperature for TiAl alloy. The suitable thermal processing parameter of the alloy were established by processing maps based on dynamic material model (DMM). The results show that TiAl alloy has positive strain rate sensitivity and negative temperature sensitivity, and the flow stress curves are mainly characterized by dynamic recrystallization softening mechanism. The predicted values of the physical constitutive model are in good agreement with the experimental values. According to the analysis of processing maps for the alloy, the range of appropriate thermal processing parameters are 1360-1523 K and 0.001-0.02 s-1.

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