Mg对过共晶Al-Si合金组织改性作用研究  

Effect of Mg Addition on Microstructure Modification of Hypereutectic Al-Si Alloy

作　　者：顾伟璐 陆从相[1] 周鹏飞[1,2] GU Wei-lu;LU Cong-xiang;ZHOU Peng-fei(Yancheng Vocational Institute of Industry Technology,School of Automotive and Transportation,Yancheng 224005,Jiangsu,China;Yancheng Institute of Technology,School of Materials Science and Engineering,Yancheng 224051,Jiangsu,China)

机构地区：[1]盐城工业职业技术学院汽车与交通学院,江苏盐城224005 [2]盐城工学院材料工程学院,江苏盐城224051

出　　处：《铸造》2021年第8期921-927,共7页Foundry

基　　金：2019校级创新团队项目(YGYKT-04);2019校级自然科学重点项目(ygy1904);2019江苏高校“青蓝工程”培养项目。

摘　　要：利用Thermo-Calc软件模拟计算了Al-17Si-xMg(x=0~10%)相图,在Mg含量为4.6%和6.8%这两个临界点时,液相线温度、二元共晶反应温度以及Mg_(2)Si的形成温度区间都在改变。当Mg含量由0增加至4.6%时,从二元L→Al+Si反应向三元L→AL+Mg_(2)Si反应转变,共晶反应温度不断下降随后保持不变。共晶的转变致使共晶Si由长条状转变为短杆状,因此提高了整体硬度,尽管初生Mg_(2)Si的硬度比初生Si小的多。The calculated phase diagrams of Al-17%Si alloy with the addition of Mg up to 10wt.%indicate two criticalcomposition points at 4.6wt.% and 6.8wt.% Mg where the liquidus and binary reaction temperatures as well asthe temperature range of the Mg_(2)Si phase formation have been changed.The eutectic formation temperatureis decreased with the addition of Mg up to 4.6wt.% Mg,followed by constant value due to the change ofthe eutectic formation reaction from the binary(L→Al+Si)to the ternary(L→Al+Si+Mg_(2)Si).This changecontributes to the transformation of the eutectic silicon in matrix from long platelet to short rod particles,resulting in overall increased hardness of the high Mg alloys even though the hardness of the primary Mg_(2)Si particles is much smaller than that of the primary silicon particles.

关 键 词：THERMO-CALC 相图 液相线 共晶 初生SI Mg_(2)Si 

分 类 号：TG146.21[一般工业技术—材料科学与工程]