TiAl合金的物理本构模型与加工图  

Physical constitutive model and processing map of TiAl alloy

作　　者：任书杰[1,2] 王克鲁 鲁世强[1] 刘大博[2] 田野[2] 罗飞[2] REN Shu-jie;WANG Ke-lu;LU Shi-qiang;LIU Da-bo;TIAN Ye;LUO Fei(School of Aerospace Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China;Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]南昌航空大学航空制造工程学院,南昌330063 [2]北京航空材料研究院,北京100095

出　　处：《中国有色金属学报》2020年第6期1289-1296,共8页The Chinese Journal of Nonferrous Metals

基　　金：南昌航空大学研究生创新专项基金资助项目(YC2016033);国家自然科学基金资助项目(51464035);江西省教育厅科技项目(GJJ160683)。

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。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.

关 键 词：TIAL合金 物理本构模型 加工图 流变应力 

分 类 号：TG146.2[一般工业技术—材料科学与工程]