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通过对3种不同Mn含量的Mg-6Zn-XMn变形镁合金的微观组织的观察及力学性能的测定,研究了Mn含量对Mg-Zn-Mn镁合金显微组织和力学性能的影响。结果表明:Mn元素以单质形式弥散地分布于Mg-Zn-Mn合金中,起到阻碍晶粒长大的作用,即随着Mn含量的增加,晶粒尺寸减小;Mn含量的变化对合金的屈服强度有一定的影响,即随着Mn含量的增加,屈服强度增加,其中挤压态增幅最大,双级时效次之,增幅分别是14%和5%;而Mn含量的变化对T6、T4+双级时效后合金的抗拉强度和延伸率的影响规律不明显,其中含0.68%Mn(质量分数,下同)的合金整体性能较优,经双级时效后具有最高抗拉强度,达到360MPa,伸长率为5.2%。
The effects of Mn content on the microstructure and mechanical properties of Mg-Zn-Mn magnesium alloy were studied by observing the microstructure and mechanical properties of three different Mg-6Zn-XMn deformed Mg alloys. The results show that the Mn element disperses in the Mg-Zn-Mn alloy as a single element, which hinders the grain growth. The grain size decreases with the increase of Mn content. The change of Mn content affects the growth of the alloy The yield strength increases with the increase of Mn content, of which the maximum increase of squeeze state, followed by two-stage aging, the increase is 14% and 5%, respectively; and the change of Mn content has a significant effect on the yield of T6, The effect of Tensile Strength and Elongation rate of alloy after T4 + B-stage aging is not obvious. The alloy containing 0.68% Mn (mass fraction) is superior to the alloy with the highest tensile strength after two-stage aging 360MPa, elongation of 5.2%.