摘要
利用SHPB(分离式霍布金森压杆)技术对AZ61镁合金进行了动态压缩实验,并利用金相和扫描电镜对冲击后的试样进行了显微分析。讨论了该合金在常温下的动态断裂和塑性变形机制。结果表明:AZ61镁合金的动态压缩应力-应变曲线表现出较强的应变硬化特性,其屈服强度随应变速率增大而升高,断口呈现大量解理台阶和少量韧窝并存的混合形貌,塑性变形方式为滑移和孪生共存。
The Split Hopkinson Pressure Bar（SHPB） was used for investigating dynamic mechanical properties of extrusion formed AZ61 alloy. The samples after impact were analized by scanning electron microscope （SEM） and metallography. The alloy＇s dynamic crack performance and plastic deformation mechanism at room temperature were discussed. The results showed that the alloy performed strain hardening under high strain rate compression. The samples were brittle ruptured under impact basically, but a few dimples can also be found on the fracture section. Twinning and glide coacted during the alloy＇s plastic deformation. Remelting was observed under SEM while the strain rate of the test reached 2.3× 10^3.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2009年第11期51-54,共4页
Journal of Materials Engineering
