摘要
为了揭示镁合金在高应变率载荷作用下容易发生变形局域化的机理,采用分离式Hopkinson杆对AZ31镁合金进行冲击压缩和拉伸试验,而后对冲击后的试样进行变形机制分析。分析表明:镁合金的变形局域化区域也和钛合金等材料中的绝热剪切带区域一样由细小晶粒组成,但是这种细小晶粒不是由于动态再结晶所致,而是由大致相同的连接成线的晶体学取向的晶粒在外载荷作用下大量孪生变形造成的。
In order to find the reason that the strain localization take places easily under high strain rate loading, AZ31 magnesium alloy was impacted by compressive and tensile split Hopkinson bars, then the specimens were tested by optical microscopy. The result shows that the deformation localization zone of AZ31 magnesium alloy consists of a lot of refine grains as the grains in adiabatic shear band zone of Ti alloy and other alloys, while the grain refinement result from twinning but dynamic recrystallization.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第6期1111-1113,共3页
Rare Metal Materials and Engineering
关键词
冲击载荷
变形局域化
孪生
high strain rate loading
deformation localization
twinning
