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采用霍普金森压杆技术对AZ31镁合金进行室温下应变速率为1 000~3 000s-1的高速冲击,利用光学显微镜和扫描电镜对断裂试样的微观组织和断口形貌进行分析。结果表明,随着应变速率的增加,材料的断裂趋势增加,材料主要表现为沿晶断裂和穿晶断裂的混合断裂方式,断口形貌具有典型的准解理断裂特征;孪晶和晶粒边界是裂纹扩展源,孪生和裂纹在变形过程中存在竞争关系。
The Hopkinson pressure bar technology was used to measure the microstructure and fracture morphology of AZ31 magnesium alloy at room temperature with strain rate of 1 000-3 000 s-1. The microstructure and fracture morphology of fracture specimens were analyzed by optical microscope and scanning electron microscope. The results show that the fracture tendency of the material increases with the increase of strain rate, and the material mainly shows as mixed fracture mode of intergranular fracture and transgranular fracture. The fracture morphology has typical quasi-cleavage fracture characteristics. The twin and grain boundary Is a source of crack growth, twins and cracks in the deformation process there is a competitive relationship.