挤压后Mg-3Sn-2Al-1Zn-0.6Sb镁合金时效的组织性能研究

Study on Microstructure and Properties of Extrusion Magnesium Alloy Mg-3Sn-2Al-1Zn-0.6Sb After Aging

摘要:

以Mg-3Sn-2Al-1Zn-0.6Sb镁合金经过正挤压与复合挤压后的材料为研究对象，利用X射线衍射（XRD）、扫描电子显微镜（SEM）和显微硬度测试等方法，研究了不同温度和时间下挤压后镁合金的组织和性能。结果表明：随着时效温度的升高，析出相Mg₂Sn和Mg₁₇Al₁₂的数量显著增加，材料硬度提升幅度也更大；随着时效时间的增加，时效硬度呈现先增加后下降的趋势；正挤压与复合挤压样品均在时效4 h后达到峰时效，正挤压试样的最大显微硬度值为98.9 HV，而复合挤压试样的最大显微硬度值为81.2 HV，表明时效对正挤压材料的强化效果明显优于复合挤压材料。

Abstract:

The microstructure and properties of an Mg-3Sn-2Al-1Zn-0.6Sb magnesium alloy were investigated after undergoing forward extrusion and combined extrusion processes. X-ray diffraction （XRD）， scanning electron microscopy （SEM）， and microhardness testing were employed for analysis. The results demonstrated that an increase in aging temperature led to a noticeable rise in the precipitation of Mg₂Sn and Mg₁₇Al₁₂ phases， accompanied by a corresponding increase in hardness. Furthermore， an increase in aging time initially resulted in an increase in hardness， followed by a subsequent decrease. The highest microhardness values for both forward extrusion and combined extrusion samples were achieved after 4 h of aging. Specifically， the maximum microhardness for the forward extrusion samples was measured at 98.9 HV， while the combined extrusion samples reached an value of 81.2 HV. These findings suggest that the strengthening effect of aging on the forward extrusion was significantly superior to that observed in the combined extrusion process.