镁合金冲击性能研究

Investigation on Impact Performance of Magnesium Alloy

采用Hopkinson研究镁合金(MB15)高应变速率(冲击)下的变形和破坏形式,以寻求提高镁合金的抗冲击性能的措施。通过对不同应变速率下压杆实验研究,建立镁合金在高应变速率下动态性能与冲击速度的关系,并分析其形成的原因。结果表明,MB15在冲击状态下动态屈服强度的提高是由于形成很细小的孪晶,有明显的晶界。变形量达到22%,表明研究镁合金有良好的抗冲击性。

In order to seek the measures that improve shock resistance of magnesium alloy, the technology of split Hopkinson pressure bars (SHPB) is used, the deformation behaviour was studied under high strain rate of ZK60 magnesium alloy. Through the impact test at the different speed, the relationship was established between the dynamic performance and the impact speed of magnesium alloy, and its formatiao was analyzed. Fhe result indicate thet the reason of dynamic performance improvement of ZK60 alloy is that come into being many fine twinned crystal, and there are obvious grain boundary. At the same time, the deformation amount can be up to 22%, it indicates that magnesium alloy has good shock resistance.