TA5钛合金的应变补偿物理本构模型和加工图  

Strain Compensation Physical Constitutive Model and Processing Map of TA5 Titanium Alloy

作　　者：王俊[1] 王克鲁[1] 鲁世强[1] 李鑫[1] 欧阳德来[2] 邱仟 高鑫 张开铭 WANG Jun;WANG Kelu;LU Shiqiang;LI Xin;OUYANG Delai;QIU Qian;GAO Xin;ZHANG Kaiming(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China;School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造工程学院,南昌330063 [2]南昌航空大学材料科学与工程学院,南昌330063

出　　处：《材料研究学报》2022年第3期175-182,共8页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51761029);南昌航空大学研究生创新专项基金(YC2020026)。

摘　　要：使用Gleeble-3800热模拟试验机对TA5钛合金进行等温恒应变速率压缩,研究其在变形温度为850~1050℃、应变速率为0.001~10 s^(-1)和最大变形量为60%条件下的高温热变形行为;建立了引入物理参量的应变补偿本构模型,并根据DMM模型得到了加工图。结果表明:TA5钛合金为正应变速率敏感性和负变形温度相关性材料;考虑物理参量的应变补偿本构模型具有较高的预测精度,其相关系数R为0.99,平均相对误差AARE为8.95%。分析加工图和观察微观组织,发现失稳区域(850~990℃,0.05~10 s^(-1))的主要变形机制为局部流动;稳定区域(870~990℃,0.005~0.05 s^(-1))的主要变形机制为动态回复和动态再结晶。TA5钛合金的最佳热加工工艺参数范围为870~990℃和0.005~0.05 s^(-1)。The thermal deformation behavior of TA5 Ti-alloy was investigated via Gleeble-3800 thermal simulation machine in temperature range of 850~1050℃by strain rate within 0.001~10 s^(-1),while the maximum deformation of 60%;A strain compensation constitutive model in consideration of the relevant physical parameters was established,and the processing diagram was obtained according to the DMM model.The results show that:TA5 Ti-alloy is a kind of material with positive strain rate sensitivity and negative deformation temperature dependence;By taking physical parameters into account,the established strain compensation constitutive model has high prediction accuracy with a correlation coefficient R of 0.99,while the average relative error AARE is 8.95%.It was found that the main deformation mechanism in the instability zone(850~990℃,0.05~10 s^(-1))was local flow,which accords well with the analysis result of processing diagram coupled with observation of the microstructure;The deformation mechanisms in the stable region(870~990℃,0.005~0.05 s^(-1))are mainly dynamic recovery and dynamic recrystallization.It follows that the optimal processing parameters for thermal deformation of TA5 Ti-alloy are 870-990℃and 0.005~0.05 s^(-1).

关 键 词：金属材料 TA5钛合金 高温变形行为 物理本构 加工图 工艺参数优化 

分 类 号：TG146.23[一般工业技术—材料科学与工程]