硼对亚共晶Al-Si合金的细化作用  

Refining effect of boron on hypoeutectic Al Si alloys

作　　者：王丽[1] 边秀房[1] 孙益民 

机构地区：[1]山东工业大学材料科学与工程学院,济南250061

出　　处：《中国有色金属学报》1999年第4期714-718,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金!(5964706);山东省自然科学资助!(Y96F05087)

摘　　要：利用ＤＳＣ，ＳＥＭ 和Ｘ 射线衍射等手段， 分析了硼对纯铝及亚共晶ＡｌＳｉ 合金的细化作用。发现在纯铝中， ＡｌＢ２ 分布在铝的晶界上， 无细化作用； 而在ＡｌＳｉ 合金中， ＡｌＢ２ 具有细化α（Ａｌ） 晶粒的性能。分析认为， 在ＡｌＳｉ 加硼的熔体中， ＡｌＢ２ 虽不能作α（Ａｌ） 的核心， 但它为Ｓｉ 的析出提供形核衬底，随温度的下降， α（Ａｌ） 在Ｓｉ 相上形核， 达到细化的目的。Refining effect of boron on the hypoeutectic Al Si alloys and pure aluminum has been studied with SEM and XRD. The results indicate that in pure aluminum AlB 2 segregates on the grain boundary without refining effect; and in Al 7Si alloys AlB 2 compound can refine α (Al) grains. In Al Si melt added boron melt, although AlB 2 does not take part directly in the nucleation process, it provides a substrate for nucleation of silicon on which subsequently nucleates α (Al) with the decrease of temperature. Refining effect of boron on the hypoeutectic Al Si alloys and pure aluminum has been studied with SEM and XRD. The results indicate that in pure aluminum AlB 2 segregates on the grain boundary without refining effect; and in Al 7Si alloys AlB 2 compound can refine α (Al) grains. In Al Si melt added boron melt, although AlB 2 does not take part directly in the nucleation process, it provides a substrate for nucleation of silicon on which subsequently nucleates α (Al) with the decrease of temperature.

关 键 词：细化作用 形核 衬底 硼 亚共晶合金 铝硅合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程]