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The effects of RE on the microstrcture of as-cast Mg-8Zn-4Al magnesium alloys were investigated. The results show that the solidification range of Mg-8Zn-4Al-xRE alloys increases with RE additions. A binary eutectic reaction can arise and produce a new phase (Mg:Al:Zn:RE) and the temperature of phase transformation point of the new phase is 412.85 C. In Mg-8Zn-4Al-1.5RE alloy, a small amount of Mg:Al:Zn:RE phase and ε phases are found besides a(Mg),φand r phases. Also microstructures of Mg-8Zn-4Al alloys can be refined by addition of 1.5% RE obviously. 相似文献
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汽车用高温镁合金的研究进展 总被引:12,自引:0,他引:12
综述了国内外高温镁合金的研究进展。分别阐述了M6—A1系合金、Mg—zM系合金、M6—RE系合金材料的性能。重点讨论了各种镁合金的抗高温蠕变机理,及其在汽车工业中要求铸造高力学性能、高密性零件(发动机、油底壳)、动力系统零件(变速器、传动轴箱)的应用。并对高温镁合金的研究开发提出了一些建议。 相似文献
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IntroductionMagnesium alloys are called green-engineeringmaterial with great development potential becauseof its low density, high specific strength and stiff-ness, superior damping capacity, good electromag-netic shielding characteristics and good machinabil-ity[1]. However, the number of commercially avail-able magnesium alloys is still limited especially forapplication at elevated temperatures. The applica-tions of most common magnesium alloys such asAZ91 and AM60 with outstanding mechani… 相似文献
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