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采用金相显微镜、扫描电子显微镜和拉伸力学性能测试等手段,对不同表面机械研磨时间处理的Mg-3Al-1Zn合金的显微组织和力学性能进行研究。结果表明,随着表面机械研磨时间的增加,Mg-3Al-1Zn合金板材的梯度纳米结构表面层厚度逐渐增加,且在表面机械研磨时间超过6 min后增加幅度较小;随着表面机械研磨时间的延长,表层晶粒的平均尺寸没有明显降低,但是微观应变有所增加,Mg-3Al-1Zn合金的抗拉强度和屈服强度逐渐上升,而断后伸长率逐渐降低。
The microstructure and mechanical properties of Mg-3Al-1Zn alloy treated by different surface mechanical grinding time were studied by means of optical microscope, scanning electron microscope and tensile mechanical properties test. The results show that with the increase of surface mechanical grinding time, the thickness of gradient nanostructured surface layer of Mg-3Al-1Zn alloy sheet gradually increases, and the increase extent of surface gradient is smaller after the surface mechanical grinding time exceeds 6 min; with the surface mechanical grinding time , The average grain size of the surface layer did not decrease obviously, but the micro-strain increased. The tensile strength and yield strength of Mg-3Al-1Zn alloy gradually increased, while the elongation decreased gradually.