半固态铝硅合金中共晶硅的形貌  

Morphology of eutectic silicon in semisolid Al-Si alloy

作　　者：李树索[1] 赵爱民[1] 毛卫民[1] 钟雪友[1] 韩雅芳 

机构地区：[1]北京科技大学铸造研究所,北京100083

出　　处：《材料科学与工艺》2000年第2期8-11,共4页Materials Science and Technology

基　　金：国家自然科学基金! ( 5 97710 11)

摘　　要：利用扫描电镜研究了未变质和锶变质半固态铝硅合金中共晶硅的形貌 .实验结果表明 :未变质半固态合金中共晶硅的形貌较常规铸态合金有较大变化 ,从成簇的细长片状过渡到以粗短片状或碎块状为主 ;锶变质半固态合金中的共晶硅仍以细长片状为主 ,但有一小部分为粗短片状或碎块状 .上述结果与旋转磁场引起的熔体流动对凝固过程的影响有关 .The morphology of eutectic silicon in semisolid Al-Si alloy with Sr modification or without Sr modification has been studied. The morphology of eutectic silicon in no modification alloy has been partly changed from long and thin strip in conventional casting structure to short and thick strip or broken lump. The morphology of eutectic silicon in Sr modification alloy is mainly long and thin strip, and a little short and thick strip or broken lump. All the results are related to the solidifying process in the rotated magnetic field.

关 键 词：共晶硅形貌 铝硅合金 半固态铸造 锶变质处理 

分 类 号：TG292[金属学及工艺—铸造]