摘要
利用分离式Hopkinson杆实验加载装置,结合入射波整形技术,进行MB2合金不同初始温度、不同温度、不同应变率下冲击压缩实验。并利用获得的应力-应变数据,采用修正的Johnson-Cook本构模型,拟合MB2合金的本构关系。同时,利用金相分析方法,分别对回收试样的横截面和纵截面的晶粒的变形情况进行显微组织观察分析,解释MB2高温-高应变率下的变形机理主要是特定的滑移系上的晶粒经历了长大-滑移的变形机制。
Dynamic shock compression tests was conducted by Split Hopkinson Pressure Bar （SHPB） apparatus combined with pulse shaping techniques to study the Magnesium-Aluminum Alloy （MB2） under high temperature and high strain rates conditions. The modified Johnson-Cook constitutive model was fitted based on the stress-strain data. The micro-deformation mechanism of MB2 alloy was investigated by metallographic observations for the cross sections and longitudinal sections respectively through using the recovered specimen. The deformation mechanism of MB2 alloy is that internal grains slip along some crystallographic directions, following grain growth.
出处
《兵器材料科学与工程》
CAS
CSCD
2009年第5期8-11,共4页
Ordnance Material Science and Engineering
基金
国家自然科学基金-青年基金项目(10802080)
