摘要
通过重熔-凝固试验,研究了接近AA5083合金成分的Al-5Mg-0.8Mn合金的凝固组织。结果表明:Fe和Si元素对Al-5Mg-0.8Mn有重大影响,促进了金属间化合物Al_6(Fe,Mn)和Mg_2Si的形成。当Fe、Si含量很低时,Al-5Mg-0.8Mn合金的凝固组织非常简单,只是在α-Al基体上零星散落着一些细小的Al_6(Fe,Mn)共晶相。当Fe、Si含量较高时,合金中不但出现了大量粗大的Al_6(Fe,Mn)和Mg_2Si共晶相,而且,共晶相Al_6(Fe,Mn)呈现多种不同的形态,而Mg2Si相主要呈汉字状。
The solidification structure of Al-5Mg-0.8Mn alloys which were closed to the composition specification of AA5083 alloy was investigated through remelting-solidification experiment. The results indicate that the elements iron and silicon are of significant influence on the solidification behavior and structure of Al-5Mg-0.8Mn alloys. The alloy with low concentrations of iron and silicon displays a simple microstructure with a small amount of intermetallic Al6（Fe, Mn） scattering on α-Al matrix. In the alloy with high concentrations of iron and silicon, the solidification structures are very complicated with a large amount ofinterematllics Al6（Fe,Mn） and Mg2Si. The intermetallic Al6（Fe, Mn） displays several different shapes. MgESi phase mainly shows a Chinese script morphology.
出处
《热加工工艺》
CSCD
北大核心
2015年第23期51-54,共4页
Hot Working Technology
关键词
铝合金
凝固
微观组织
aluminum alloy
solidification
microstructure
