AZ80镁合金的动态力学性能研究  

Research on Dynamic Mechanical Properties of AZ80 Magnesium Alloy

作　　者：常变红[1] 刘同鑫[1] 尹建平[1] 王志军[1] 

机构地区：[1]中北大学机电工程学院,山西太原030051

出　　处：《中北大学学报（自然科学版）》2015年第3期389-392,398,共5页Journal of North University of China(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11402027);中北大学第十届研究生科技基金项目(20131020)

摘　　要：AZ80镁合金应用越来越广泛,研究其冲击载荷下的响应行为具有一定意义.利用分离式霍普金森杆实验对AZ80镁合金进行动态试验,对冲击压缩后的材料进行金相分析,得到了变形机制;通过对不同冲击速度下的实验研究,建立了AZ80镁合金的动态强度和应变率的关系,拟合得到了常温下的Johnsoncook本构方程,并进行数值模拟与实验进行对比.结果表明:AZ80镁合金的应力-应变曲线随应变率的增加而呈增大的趋势,材料在高应变率下的强度极限增加,但应变率效应不敏感.数值模拟与实验具有较好的一致性.金相分析发现,孪晶的形成是其形变的主要机制.For the more and more widely applied of AZ80 magnesium alloy in our country,to study the response behavior under impulse load has a certain significance.Using split Hopkinson bar experiment for AZ80 magnesium alloy dynamic test,metallurgical analysis were carried out for the compressed material,and deformation mechanism were obtained.Through the experimental research under different impact velocity,established the relationship of dynamic strength and strain rate and fitted Johnson-cook constitutive equation at room temperature of AZ80 magnesium alloy,and the numerical simulation and experimental results were compared.The results show that：the stress-strain curve of AZ80 magnesium alloy shows an increasing trend with the increasing strain rate,the ultimate strength of the material at high strain rate increases,but is not sensitive to the strain rate effect.Numerical simulation has good consistency with the experimental results.Metallographic analysis find that the formation of twins is the main mechanism of deformation.

关 键 词：固体力学 AZ80镁合金 动态压缩 应变率 

分 类 号：O347.3[理学—固体力学]