Effects of strontium and boron interactions in Al-7Si alloys

作     者：Chen Xiang Li Yanxiang 

作者机构：Key Laboratory for Advanced Materials Processing Technology Ministry of Education Department of Mechanical EngineeringTsinghua University Beijing 100084 China 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2010年第7卷第4期

页      面：325-330页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：Al-Si alloy strontium boron modification interaction 

摘      要：Effects of boron and strontium combined treatment on the microstructure of hypoeutectic Al-7Si alloy have been studied. Experimental results show that strontium has no significant effect on the grain refinement efficiency of boron and the eutectic silicon modification efficiency is not only related to the strontium content but also related to the boron content in the Al-7Si alloy melt. There is a negative interaction between boron and strontium that results in the formation of a strontium-boron-aluminum containing compound, which reduces the effective strontium level and decreases the eutectic silicon modifciation efficiency substantially. The refinement and modification mechanisms remain unchanged after the combined addition of strontium and boron. Based on the experimental results, a model for assessing the modifciation level in the Al-Si alloy melts after combined addition of boron and strontium was presented.