TA11钛合金热变形本构方程  

Constitutive Equations for Hot Deformation of TA11 Titanium Alloys

作　　者：廖毅 庞玉华[1] 杨艳慧[2] 张明申 LIAO Yi;PANG Yuhu;YANG Yanhui;ZHANG Mingshen(College of Metallurgy Engineering, Xi＇an University of Architecture and Technology, Xi＇an 710055, China;School of Materials Science and Engineering, Northwestern Polytechnical University, Xi＇an 710012, China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]西北工业大学材料学院,陕西西安710072

出　　处：《热加工工艺》2018年第10期46-49,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51504195)

摘　　要：在Gleeble-3500热模拟试验机上进行等温热压缩试验,得到TA11钛合金在温度为954~1074℃、应变速率为0.05~5 s^（-1）、变形量为60%条件下的真应力-真应变曲线。根据真应力-真应变曲线,分析流变应力随变形温度、应变速率和应变的变化规律。结果表明,流变应力与变形速率成正比,与变形温度成反比;利用Arrhenius双曲正弦方程和Z参数建立了TA11钛合金的热变形本构方程。经验证明,试验值与所建立的本构方程的预测值吻合较好,可用于预测TA11钛合金塑性变形过程中的变形抗力和作为有限元数值模拟的材料模型。The true stress-true strain curves of TA11 titanium alloy under the condition of temperature of 954-1074 ℃,strain rate of 0.05-5 s^（-1） and deformation degree of 0.6 were obtained by carrying isothermal hot compressive experiment on hot simulation machine of Gleeble-3500. The change rule of flow stress with deformation temperature, strain rate and strain was analysed according to the true stress-true strain curves. The results show that the flow stress is proportional to the strain rate, and is inversely proportional to the deformation temperature. The hot deformation constitutive equation for TA11 titanium alloy was established by hyperbolic sine Arrhenius type and Z parameter. The experience shows that the experimental values are coincident with the predicted values of the constitutive equation, which can be used to predict the deformation resistance of TA11 titanium during plastic deformation and as the material model for finite element numerial simulation.

关 键 词：TA11钛合金 热变形 本构方程 

分 类 号：TG131[一般工业技术—材料科学与工程]