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镁合会的动态压缩应力-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 elec-tron microscope (SEM) and metallography. The alloy's dynamic crack performance and plastic de-formation mechanism at room temperature were discussed. The results showed that the alloy per-formed 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 co-acted during the alloy's plastic deformation. Remehing was observed under SEM while the strain rate of the test reached 2.3 × 10~3.
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