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利用光学显微镜、扫描电镜、能谱分析仪、X射线衍射仪及压缩试验等,研究了Zr和固溶工艺对Mg-Er-Zn合金组织和力学性能的影响。结果表明,Zr的加入不影响合金的相组成,但晶界处X相的质量分数减少。Zr显著细化了Mg97.5Er2Zn0.5合金的组织,提高了合金力学性能。Zr的加入缩短了X相完全固溶的时间;合金在固溶后采用炉冷工艺时晶内析出条纹状LPSO相,而在水冷时没有发现。固溶后,合金力学性能高于铸态合金,加Zr后合金的力学性能高于无Zr合金,炉冷合金的力学性能低于水冷合金。
The effects of Zr and solution treatment on the microstructure and mechanical properties of Mg-Er-Zn alloy were investigated by optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and compression tests. The results show that the addition of Zr does not affect the phase composition of the alloy, but the mass fraction of the X phase at the grain boundary decreases. Zr significantly refined the microstructure of Mg97.5Er2Zn0.5 alloy and improved the mechanical properties of the alloy. The addition of Zr shortens the complete solution time of X phase. When the alloy is in the solution-cooled state, the grain-like LPSO phase precipitates inside the crystal and is not found in water cooling. After solution treatment, the mechanical properties of the alloy are higher than that of the as-cast alloy. The mechanical properties of the alloy after addition of Zr are higher than that of the alloy without Zr. The mechanical properties of the furnace-cooled alloy are lower than that of the water-cooled alloy.