47Zr-45Ti-5Al-3V合金高温流变行为及本构模型研究  

Constitutive Modeling for High-Temperature Flow Behaviour of 47Zr-45Ti-5Al-3V Alloy

作　　者：杨秋月 向嵩[1] 谭元标 刘文昌[2] 赵飞[1] Yang Qiuyue;Xiang Song;Tan Yuanbiao;Liu Wenchang;Zhao Fei(Guizhou Key Laboratory of Materials Mechanical Behaviour and Microstructure,Guizhou University,Guiyang 550025,China;Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]贵州大学贵州省材料结构与强度重点实验室,贵州贵阳550025 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《稀有金属》2020年第8期816-825,共10页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51804087);贵州省科技计划项目(黔科合平台人才[2018]5781);贵州省基础研究计划项目(黔科合基础[2019]1091);贵州省教育厅青年人才成长项目(黔教合KY字[2018]107)资助。

摘　　要：采用Gleeble 3500热模拟试验机研究了47Zr-45Ti-5Al-3V合金在变形温度为650~850℃和应变速率为1×10-3~1×100s-1的热变形行为。结果表明变形温度和应变速率对47Zr-45Ti-5Al-3V合金的热变形行为有显著影响。在低温和高应变率下,在变形初期阶段合金的流变曲线表现出一个显著的应力降现象,应力降幅值随变形温度的增加和应变速率的降低而降低,合金仅发生动态回复。在高温和低应变率下,真应力-应变曲线表现出典型的动态再结晶特征,流变应力随应变的增加先增加到一个峰值,随后随着应变的增加逐渐降低到一个稳态值。峰值应力随变形温度的降低和应变速率的增加而增大。Arrhenius-type本构方程在不同应变下的材料常数(α,Q,n和ln A)已经算出。热变形激活能Q随应变的增加先增加然后降低,而n随应变的增加逐渐降低到一个恒定值。通过应变补偿的Arrhenius-type本构方程对合金热变形过程中的流变应力进行预测,表明预测的流变应力值与实验数据吻合较好。The hot deformation behavior of 47 Zr-45 Ti-5 Al-3 V alloy at deformation temperature of 650~850°C and strain rate of 1×10-3~1×100 s-1 was studied by Gleeble 3500 thermal simulator.The results showed that the deformation temperature and strain rate had a significant effect on the hot deformation behavior of 47 Zr-45 Ti-5 Al-3 V alloy.At low temperature and high strain rate,the flow curve of the alloy showed a significant phenomenon of stress drop in the initial stage of deformation.The magnitude of stress drop decreased with increasing deformation temperature and decreasing strain rate,and only dynamic recovery occurred during hot deformation of the alloy.At high temperature and low strain rate,the true stress-strain curve exhibited typical dynamic recrystallization characteristics.The flow stress firstly increased to a peak with increasing strain,and then gradually decreased to a steady state value.The peak stress increased with decreasing deformation temperature and increasing strain rate.The material constants(α,Q,n and ln A)of the Arrhenius-type constitutive equation at different strains were calculated.The hot deformation activation energy Q firstly increased,and then decreased with the increase of strain.The value of n gradually decreased to a constant value as the strain increased.The strain-compensated Arrhenius-type constitutive equation was used to predict the flow stress during hot deformation of the alloy,which showed that the predicted flow stress values were agreed well with the experimental data.

关 键 词：47Zr-45Ti-5Al-3V合金 热变形 流变行为 本构方程 

分 类 号：TK91[动力工程及工程热物理]