Zr对Sr变质近共晶Al-Si铸造合金组织和性能的影响
来源期刊：中国有色金属学报2001年第z1期
论文作者：孙瑜 廖恒成 孙国雄
文章页码：9 - 12
关键词：Al-Si合金； 锆； 异质生核
Key words：Al-Si alloys； Zr； hetergeneous nucleation
摘 要：分析了Zr对Sr变质近共晶Al-Si铸造合金组织的影响。结果表明 ,随着Zr加入量的增加 ,枝晶α(Al)有等轴化趋势 ;当Zr加入量为0.5 %～0.6 %时 ,枝晶α完全等轴化 ;这是由于熔体中形成了ZrAl3颗粒 ,在合金凝固过程中起到了异质生核作用 ,并且Zr对共晶硅的形态、尺寸没有明显影响 ;随着Zr加入量增加 ,合金的力学性能明显提高。
Abstract: The influence of Zr on microstructures of near eutectic Al-Si alloys was studied. The results indicate that increasing Zr content, dendritic α phase tends to change from long columnar to exquiaxed. When adding 0.5～0.6%Zr, the α phase is equiaxed fairly. This is because ZrAl3 particles formed in the melt play a role of hetergeneous nucleation during solidification. There is no noticeable change of the microphology and size of eutectic silicon and mechanical properties of alloys are improved with increasing Zr content.
