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研究了Al含量及固溶时效(T6)处理对挤压铸造Mg-Al-Zn合金显微组织和力学性能的影响。结果表明,晶界上的β-Mg17Al12相的体积分数随Al含量的增加而增加,其形态由孤岛状分布向不连续网状分布变化。当Al含量为8%时,合金具有最好的综合力学性能,经400℃×12 h固溶+200℃×8 h时效处理后,其抗拉强度和断裂伸长率达到了262.49 MPa和8.46%,相对挤压铸造态分别提高了16.07%和11.02%。
The effect of Al content and solution aging (T6) treatment on the microstructure and mechanical properties of squeeze cast Mg-Al-Zn alloy was studied. The results show that the volume fraction of β-Mg17Al12 phase increases with the increase of Al content, and the morphology changes from island-like to discontinuous network. When the content of Al is 8%, the alloy has the best mechanical properties. After aging at 400 ℃ for 12 h and aging at 200 ℃ for 8 h, the tensile strength and elongation at break reach 262.49 MPa and 8.46, respectively %, Relative extrusion casting state increased by 16.07% and 11.02% respectively.