挤压和热处理对Mg-8Zn-1Al-0.5Cu-0.5Mn镁合金显微组织和力学性能的影响（英文）

发布时间：2018-07-03 12:40

本文选题：镁合金 + 挤压组织　；参考：《Transactions of Nonferrous Metals Society of China》2017年01期

【摘要】：研究挤压和热处理对Mg-8Zn-1Al-0.5Cu-0.5Mn镁合金显微组织和力学性能的影响。结果表明,合金在230和260°C挤压时呈现双峰组织,而在290°C挤压时合金发生了完全的动态再结晶。随着挤压温度的升高,合金动态再结晶越充分,从而使其基面织构降低。通过研究4种不同的热处理制度对290°C下挤压成型合金的影响发现,经过固溶+时效处理后,合金的晶粒发生明显长大。与固溶+单级时效的合金相比,固溶+双级的工艺能显著细化析出相,提高析出相的密度。同时,经固溶+双级时效处理后合金的力学性显著提高,其屈服强度、抗拉强度和伸长率分别为298 MPa、348 MPa和18%,这主要是由细小的再结晶晶粒与均匀弥散分布的第二相共同作用的结果。
[Abstract]:The effect of extrusion and heat treatment on microstructure and mechanical properties of Mg-8Zn-1Al-0.5Cu-0.5Mn magnesium alloy was studied. The results show that the alloy exhibits bimodal microstructure during 230 掳C and 260 掳C extrusion, while complete dynamic recrystallization occurs at 290 掳C extrusion. With the increase of extrusion temperature, the dynamic recrystallization of the alloy becomes more and more, which reduces the texture of the base plane of the alloy. By studying the effect of four different heat treatment systems on the extrusion forming alloy at 290 掳C, it is found that the grain size of the alloy grows obviously after the solution aging treatment. Compared with the single stage aging alloy, the solid solution two-stage process can refine the precipitated phase and increase the density of the precipitated phase. At the same time, the mechanical properties and yield strength of the alloy after two-stage aging treatment with solid solution were improved remarkably. The tensile strength and elongation are 298 MPA and 18 MPA respectively, which are mainly due to the interaction of fine recrystallized grains and the second phase with uniform dispersion distribution.
【作者单位】：中国科学院金属研究所;东北大学材料科学与工程学院;东北大学多金属共生矿生态化冶金教育部重点实验室;山东省轻质高强金属材料省级重点实验室;
【基金】：Project(2013CB632205)supported by the National Basic Research Program of China Project(51274184)supported by the National Natural Science Foundation of China
【分类号】：TG146.22;TG379;TG166.4

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