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采用消失模铸造工艺制备了固-液复合Al-Mg双合金,通过光学显微镜(OM)、扫描电镜(SEM)、能谱分析(EDS)和X射线衍射仪(XRD)等研究了浇注温度对Al-Mg双合金界面层的影响。结果表明,随着浇注温度升高,界面层厚度增加。当浇注温度为730℃时,Al-Mg双合金界面层较为致密,且厚度均匀;当浇注温度较低时,Al-Mg双合金界面层存在较多孔隙缺陷;浇注温度较高时,Al-Mg双合金界面层各处厚度不均匀。在不同浇注温度下,Al-Mg双合金铸件界面处都形成了3个不同的反应层,分别是靠近Mg基体侧的Mg17Al12+δ-Mg共晶组织层、中间的Mg_(17)Al_(12)+Mg_2Si层和靠近Al基体侧的Al3Mg2+Mg2Si层。
The solid-liquid composite Al-Mg dual alloy was prepared by the process of lost foam casting. The effects of pouring temperature on the microstructure of the alloy were investigated by OM, SEM, EDS and XRD. Al-Mg dual alloy interface layer. The results show that as the pouring temperature increases, the interface layer thickness increases. When the pouring temperature is 730 ℃, Al-Mg dual alloy interface layer is more dense and uniform in thickness. When the pouring temperature is lower, there are more porous defects in Al-Mg dual alloy interface layer. When the pouring temperature is higher, Mg dual alloy interface layer uneven thickness around. At different casting temperatures, three different reaction layers were formed at the interface of Al-Mg dual alloy casting, which were the Mg17Al12 + δ-Mg eutectic layer close to the Mg matrix, the middle Mg17Al12 ) + Mg_2Si layer and an Al3Mg2 + Mg2Si layer close to the Al substrate side.