(山東工業(yè)大學(xué)材料科學(xué)與工程學(xué)院，濟(jì)南 250061)
摘 要: 利用DSC，SEM和X射線衍射等手段，分析了硼對純鋁及亞共晶Al-Si合金的細(xì)化作用。發(fā)現(xiàn)在純鋁中，AlB2分布在鋁的晶界上，無細(xì)化作用；而在Al-Si合金中， AlB2具有細(xì)化 α(Al)晶粒的性能。分析認(rèn)為，在Al-Si 加硼的熔體中，AlB2雖不能作α(Al) 的核心，但它為Si的析出提供形核襯底，隨溫度的下降， α(Al)在Si 相上形核，達(dá)到細(xì)化的目的。
關(guān)鍵字: 亞共晶Al-Si合金；細(xì)化作用；形核；襯底
（College of Materials Science and Engineering, Shandong University of Technology, Ji'nan 250061, P. R. China）
Abstract: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 AlB2 segregates on the grain boundary without refining effect; and in Al-7Si alloys AlB2 compound can refine α(Al) grains . In Al-Si melt added boron melt, although AlB2 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.
Key words: hypoeutectic Al-Si alloys; refining effect; substrates; nucleation
