锡添加对硅铝合金铸锭中初晶硅枝晶宽度及回收率的影响

Effects of Sn Addition on Dendrite Width and Recovery Ratio of Primary Silicon in Si-Al Alloy Ingot

通过在硅铝合金熔体中添加不同原子分数(0,10%,20%,30%)的锡制备了合金铸锭,研究了锡的添加对该合金铸锭中初晶硅枝晶宽度及回收率的影响。结果表明:初晶硅枝晶宽度随着锡含量的增加而增大,当合金铸锭中硅原子分数为31.86%、锡原子分数由0增至30%时,初晶硅平均枝晶宽度由490μm增大至710μm;较低硅含量合金铸锭中的初晶硅枝晶宽度较大,锡的添加对枝晶宽度的增大效果也更明显;初晶硅的回收率随着锡含量的增加而增大,当锡原子分数由0增至30%时,实际回收率由62%增至85%。

Different contents（0,10at%,20at%,30at%）of Sn were added into Si-Al alloy melt and then the alloy ingots were prepared.The effects of Sn addition on the dendrite width and recovery ratios of the primary silicon in the alloy ingots were studied.The results show that the dendrite width of the primary silicon increased with the increase of Sn content.When the silicon content was 31.86at%,the average dendrite width of the primary silicon increased from 490μm to 710μm with the Sn content increasing from 0to 30at%.In the alloy ingot with a relatively low silicon content,the dendrite width of the primary silicon was larger and the increase effect of Sn addition on the dentrite width was more obvious.The recovery ratio of primary silicon increased with the increase of Sn content.When the Sn content increased from 0to 30at%,the real recovery ratio increased from 62%to 85%.