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以高性能镁合金Mg-Dy-Gd-Zr为研究对象,对含不同含量镝(Dy)和钆(Gd)稀土元素的两种镁合金Mg-8Dy-2Gd-0.2Zr(DG82K)、Mg-2Dy-8Gd-0.2Zr(DG28K),在不同热处理下的微观组织和力学性能进行试验分析。结果表明:镁合金微观组织为均匀分布的等轴颗粒,晶粒比较细小,合金晶粒尺寸60μm左右;随Dy元素含量增加和Gd元素含量减小,合金微观组织中α-Mg相增加,第二相却减小,且合金维氏硬度也减小;随时效时间延长,DG28K合金维氏硬度呈现先增加后减小趋势,而DG82K合金维氏硬度呈现先增加后减小再增加最后减小趋势;经T4热处理DG82K、DG28K合金抗拉屈服强度和极限抗拉、抗压强度都减小,而抗压屈服强度和伸长率都增加,而DG82K、DG28K合金压缩率分别呈现减小和增加趋势。
The high-performance magnesium alloy Mg-Dy-Gd-Zr was studied in this paper. Two Mg-8Dy-2Gd-0.2Zr (DG82K) and Mg- 2Dy-8Gd-0.2Zr (DG28K). The microstructure and mechanical properties under different heat treatments were analyzed. The results show that the microstructure of magnesium alloy is equiaxed grains with uniform grain size and grain size of about 60μm. With the increase of Dy content and the decrease of Gd content, the α-Mg phase in the alloy microstructure increases. The Vickers hardness of DG28K alloy first increases and then decreases with the increase of aging time, while the Vickers hardness of DG82K alloy increases first and then decreases and then increases and finally decreases The tensile yield strength and the ultimate tensile strength and compressive strength of DG82K and DG28K alloys decreased with T4 heat treatment, while the compressive yield strength and elongation both increased, while the compressive ratios of DG82K and DG28K alloy decreased and increased respectively .