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通过微观组织观察和力学性能测试,研究了镁合金箱体挤压件角部裂纹产生的原因。结果表明:裂开的主要原因是铸态AZ80材料力学性能不佳,其组织是由较为粗大的树枝状晶体构成的;均匀化处理能有效减轻枝晶偏析,使材料组织更加均匀,力学性能得到很好改善。因此,均匀化处理能有效防止裂纹的产生。
Through the microstructure observation and the mechanical property test, the reason of the corner crack of magnesium alloy extrusion was studied. The results show that the main reason for cracking is that the mechanical properties of as-cast AZ80 material are poor, and the microstructure of the as-cast AZ80 material is composed of coarser dendrites. The homogenization treatment can effectively reduce the segregation of dendrite, make the material structure more uniform and get the mechanical properties Very well improved. Therefore, the homogenization treatment can effectively prevent the generation of cracks.