Ta-W合金的动态力学特性及其本构关系  

Dynamic Behavior and Constitutive Model of Tantalum Tungsten Alloy

作　　者：白润[1] 张小明[1] 胡忠武[1] 郑欣[1] 张廷杰[1] 王东辉[1] 李中奎[1] 

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2008年第9期1526-1529,共4页Rare Metal Materials and Engineering

摘　　要：在-50-700℃较大温度范围和10^-4-10^3s^-1应变速率范围内，采用材料试验机（MTS）及分离式霍普金森压杆（split Hopkinson Pressure Bar）分别对退火态Ta-10W合金进行准静态和动态压缩试验，得到应力．应变曲线。结果表明：合金的屈服应力和流动应力都表现出很强的应变速率与温度敏感性，都随应变速率的增加而增加，随温度的升高而减小。利用所测得的应力．应变曲线拟合了Johnson．Cook本构方程，与实验数据吻合较好。Quasi-static state and dynamic compression tests of annealed Ta-10W alloy were performed at a range of strain rates from 104 to 103 s^-1 and temperatures from -50 to 700 ℃ by the Material Test System and Split Hopkinson Pressure Bar, by which the curves of stress and strain was gained. The result indicate： the yield and flow stress of the alloy is very sensitive to stain rate and temperature, which both increases with the increase of the strain rate ,decreases with the increase of the temperature. The constitutive model of Johnson-Cook was fitted by using the stress and strain curves, which is in accord with the experiment curves well.

关 键 词：TA-W合金 高应变速率 动态性能 

分 类 号：TG115.5[金属学及工艺—物理冶金]