Al-Si过共晶合金中初生硅的溶解动力学  

Dissolution kinetics of primary silicon for hypereutectic Al-Si alloy

作　　者：张蓉[1] 曹秋芳[1] 庞述先[1] 刘林[1] 

机构地区：[1]西北工业大学物理系,西安710072

出　　处：《中国有色金属学报》2000年第1期89-91,共3页The Chinese Journal of Nonferrous Metals

摘　　要：以扩散为模型 ,并考虑界面反应对初生相溶解过程的影响 ,建立了初生相在过热熔体中的溶解动力学模型。同时以Al 1 8%Si(质量分数 )合金为对象 ,在 1 1 0 0℃过热情况下 ,对该模型进行了验证 ,结果表明 :该模型基本上能反应该条件下初生硅的溶解特性。As well known, coarse primary silicon phase in Al Si hypereutectic alloy dents its mechanical properties, thus limits the application of this alloy. In addition, it has been found that primary silicon in Al Si hypereutectic alloys was of higher chemical stability in the melt, and its dissolution behavior had directly influence on the freezing microstructure and on the mechanical properties of the alloy. From above, investigating on dissolution character for primary silicon is very emergent. Therefore, the dissolution process of primary silicon particles in Al 18%Si (mass fraction) alloy was studied both by melt overheating experiment and by theoretical analysis, and a dissolution model of primary silicon in the melt was established based on the atomic diffusion and taken account of interface reaction; the results show that the theoretic curve agrees with the experiment one at overheating temperature of 1 100 ℃.

关 键 词：初生相 溶解动力学 过共晶合金 铝合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程]