母合金成分和混合温度对受控扩散凝固组织的影响  

Effect of Precursor Alloy Composition and Mixing Temperature on Controlled1 Diffusion Solidification Microstructure

作　　者：杨旭鲲 陈体军[1,2] 薛晗 张宗旭 YANG Xukun;CHEN Tijun;XUE Han;ZHANG Zongxu(College of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《热加工工艺》2023年第15期75-79,共5页Hot Working Technology

摘　　要：采用强制对流混合方式的受控扩散凝固技术制备了亚共晶Al-8%Si合金,研究了不同的母合金成分和混合温度对亚共晶Al-8%Si合金组织中初生α-Al相的形貌和尺寸的影响。结果表明,在纯Al与Al-12%Si合金混合后制备的Al-8%Si合金中初生α-Al相为细小圆整的球状晶,而且在纯Al的混合温度为665℃时,初生α-Al相的细化效果最好,晶粒尺寸可以达到43μm。随着母合金中Si含量的增加与纯Al混合温度的升高,初生α-Al相的细化效果变差。The hypoeutectic Al-8%Si alloy was prepared by using controlled diffusion solidification with forced convection mixing method.The effects of different precursor alloy composition and mixing temperature on the morphology and size of primaryα-Al phase in the microstructure of hypoeutectic Al-8%Si alloy were investigated.The results show that the primaryα-Al phase in Al-8%Si alloy prepared after mixing with pure Al and Al-12%Si alloy is a fine and round spherical crystal,and when the mixing temperature of pure Al is 665C,the refining effect of the primaryα-Al phase is the best,and the grain size can reach 43μm.With the increase of Si content in the precursor alloy and the increase of mixing temperature of pure Al,the refining effect of the primaryα-Al phase becomes worse.

关 键 词：受控扩散凝固 强制对流 亚共晶Al-8%Si合金 初生α-Al相 

分 类 号：TG292[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]