研究了泡沫纯铝和泡沫AlSi7Mg0 45的凝固方式及其对孔结构的影响 ,并讨论了熔体泡沫在凝固过程中的体积变化和孔隙率变化 .结果表明 :在合适的冷却条件下 ,纯铝熔体泡沫倾向于逐层凝固 ,在凝固过程中易形成中心缩孔 ,AlSi7Mg0 45熔体泡沫倾向于同时凝固 ,易形成热裂纹 ;纯铝熔体泡沫在凝固过程中 ,体积减小 ,孔隙率增加 ,而相对于纯铝来说 ,AlSi7Mg0 45熔体泡沫的体积及孔隙率均有所减小 The solidification mode of AlSi7Mg045 foam and its influence on the pore structure were studied.The volume change and porosity change of the melt foam during the solidification process were discussed.The results show that under the proper cooling conditions, pure aluminum The melt foam tends to solidify layer by layer, and the center shrinkage is easily formed during the solidification. AlSi7Mg0 45 melt foam tends to solidify at the same time and easily form hot cracks. The volume of pure aluminum melt foam decreases during solidification, and the porosity Increase, and compared to pure aluminum, AlSi7Mg0 45 melt foam volume and porosity are reduced