La和Y对细化后A356铝合金显微组织的影响  

Effect of RE Metal La and Y on the Microstructure of the Refined A356 Alloys

作　　者：贾锦玉 陈志强 胡文鑫[1] 吴俊子[1] 王小青[1] JIA Jin-yu;CHEN Zhi-qiang;HU Wen-xin;WU Jun-zi;WANG Xiao-qing(State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014030,China)

机构地区：[1]包头稀土研究院白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古包头014030

出　　处：《稀土》2020年第2期41-46,共6页Chinese Rare Earths

基　　金：国家重点研发计划项目(2016YFB0101205)。

摘　　要：利用金相显微镜和扫描电子显微镜等设备研究了稀土金属La和Y对经AlTiB和AlSr细化后的A356铝合金α-Al枝晶和共晶Si相显微组织的影响及作用机理。研究表明,金属La和Y加入A356铝合金后以AlSiLa或AlSiY的形式存在于α-Al相晶界中。La和Y不仅对A356铝合金共晶硅相具有明显的变质效果,而且对α-Al晶粒有细化作用。其中Y变质共晶硅和细化α-Al晶粒的效果均优于La。The effects and mechanism of the RE metal La and Y on the microstructures of theα-Al phases and eutectic silicon phases of the A356 alloys refined and modified with AlTiB and AlSr were investigated by optical microscopy and scanning electron microscopy.The results indicate that La and Y exist in the grain boundary ofα-Al phase in the form of AlSiLa or AlSiY compound.RE metals not only have obvious modification on the eutectic silicon phase,but also have refining effect onα-Al phase.The effect of modification and refinement of the RE metal Y is better than that of the RE metal La.

关 键 词：A356铝合金 稀土 晶粒细化 变质 显微组织 

分 类 号：TG146.45[一般工业技术—材料科学与工程]