新型Al-Mg-Zn合金不同应变率动态冲击性能与组织变化  

Effect of Different Strain Rates on Dynamic Impact Properties and Microstructure of Novel Al-Mg-Zn Alloy

作　　者：刘浩然 赵泽宇 张迪[1] 张济山[1] Liu Haoran;Zhao Zeyu;Zhang Di;Zhang Jishan(State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《稀有金属材料与工程》2022年第5期1767-1772,共6页Rare Metal Materials and Engineering

基　　金：国防科技创新特区项目。

摘　　要：通过Gleeble-1500、分离式Hopkinson压杆、金相、扫描和透射电镜探究了Al-Mg-Zn合金准静态及动态冲击过程中的力学性能和组织演化。Al-Mg-Zn合金在准静态下表现为整体应变硬化效应。合金在1300~3800 s^(-1)对应变率敏感,在4800 s^(-1)时几乎无应变率敏感性。合金晶粒随应变率变化发生不同程度的变形,且随着应变率的提高,晶粒变形不均匀性加重;析出相粒子形态、密度、尺寸等在4800 s^(-1)动态冲击前后发生明显变化。The mechanical properties and microstructure evolution of novel Al-Mg-Zn alloy during quasistatic and dynamic impact processes were investigated by Gleeble-1500,separated Hopkinson pressure bar(SHPB),optical microscope,scan electron microscope and transmission electron microscope.The results show that Al-Mg-Zn alloy exhibits a global strain hardening effect in quasistatic impact.The dynamic yield strength increases first and then decreases slightly with the increase of strain rate.The grains of alloy deform to different degrees with the change of strain rate,and the grains deformation inhomogeneity become more serious with the increase of strain rate.The morphology,density and size of precipitates vary significantly before and after dynamic impact with 4800 s^(-1).

关 键 词：Al-Mg-Zn 动态力学性能 组织演化 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156.93[金属学及工艺—金属材料]