Zn对Al-4.5%Mg-1.0%Mn-0.1%Zr合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2025.09.044

摘要/Abstract

摘要： 通过直读光谱、金相显微镜、扫描电镜、透射电镜以及拉伸试验机等设备研究Zn元素对Al-4.5%Mg-1.0%Mn-0.1%Zr合金组织与性能的影响。结果表明,Al-4.5%Mg-1.0%Mn-0.1%Zr合金引入Zn元素后发生非平衡共晶反应形成Mg₃₂(Al,Zn)₄₉共晶相,一定程度上细化了铸锭晶粒尺寸,细化率接近23%。Al-4.5%Mg-1.0%Zn-1.0%Mn-0.1%Zr合金具有更细小的变形组织,且析出大量沿晶界断续分布的椭圆状和晶内分布的短棒状Mg₃₂(Al,Zn)₄₉弥散相,该相可使板材退火后仍保持较高的拉伸性能以及优异的耐腐蚀性。

关键词: Al-Mg合金, Mg₃₂(Al,Zn)₄₉, 晶粒细化, 力学性能, 耐腐蚀性

Abstract: Effect of Zn element on the microstructure and properties of Al-4.5%Mg-1.0%Mn-0.1%Zr alloy were studied by using equipment such as direct reading spectroscopy, metallographic microscope, scanning electron microscope, transmission electron microscope, and tensile testing machine. The results show that the Al-4.5%Mg-1.0%Mn-0.1%Zr alloy undergoes non-equilibrium eutectic reaction after introducing Zn element, forming Mg₃₂(Al, Zn)₄₉ eutectic phase, which refines the grain size of the ingot to a certain extent, with a refinement rate of nearly 23%. The Al-4.5%Mg-1.0%Zn-1.0%Mn-0.1%Zr alloy has a finer deformation microstructure and there are a large amount of elliptical and short rod-shaped Mg₃₂(Al, Zn)₄₉ dispersed phases intermittently distributed along grain boundaries. These phases can maintain high tensile properties and excellent corrosion resistance of the plate after annealing.

Key words: Al-Mg alloy, Mg₃₂(Al,Zn)₄₉, grain refinement, mechanical properties, corrosion resistance

中图分类号:

TG146

李瑞霞, 秦翔智, 赵佳蕾, 李兵, 赵巍, 周毅, 黎柏康, 章晶林. Zn对Al-4.5%Mg-1.0%Mn-0.1%Zr合金组织与性能的影响[J]. 金属热处理, 2025, 50(9): 278-286.

Li Ruixia, Qin Xiangzhi, Zhao Jialei, Li Bing, Zhao Wei, Zhou Yi, Li Baikang, Zhang Jinglin. Effect of Zn on microstructure and properties of Al-4.5%Mg-1.0%Mn-0.1%Zr alloy[J]. Heat Treatment of Metals, 2025, 50(9): 278-286.

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