机构地区: 中南工业大学材料科学与工程系
出 处: 《中国有色金属学报》 1997年第4期75-78,共4页
摘 要: 制备了Al5Mg、Al5Mg0.2Sc、Al5Mg0.1Zr和Al5Mg0.2Sc0.1Zr四种铸态合金,采用金相显微镜和扫描电镜观察分析了微量Sc和Zr对AlMg合金铸态组织的晶粒细化作用及其机理。结果发现,02%的Sc并未使AlMg合金产生晶粒细化作用,而02%的Sc与01%的Zr复合添加则使AlMg合金产生了极其强烈的晶粒细化作用。这一作用的产生,是由于Sc、Zr与Al在合金熔体中生成了Al3Sc和Al3Zr复合粒子,这种粒子在合金凝固过程中。 Al 5Mg, Al 5Mg 0.2Sc, Al 5Mg 0.1Zr and Al 5Mg 0.2Sc 0.1Zr cast alloys have been prepared. The effect of trace Sc and Zr on grain refinement of Al 5Mg cast alloy was studied using optical microscopy and scanning electron microscopy with EDS. The results showed that adding 0.2%Sc and 0.1%Zr to Al 5Mg alloy leads to strong grain refinement but adding only 0.2%Sc to Al 5Mg alloy has no grain refinement phenomenon. This is because, during solidification, Al 3Sc/Al 3Zr composite particles were formed in the melt playing a role of the nuclei of imhomogenized crystallization.