浇注距离对同时混合受控扩散凝固Al-Si合金组织影响  

Influence of Casting Distance on Microstructure of Simultaneously Mixed Controlled Diffusion Solidified Al-Si Alloys

作　　者：李绍斯 陈体军[1,2] LI Shaosi;CHEN Tijun(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050;Key Laboratory of Non-ferrous Metal Alloys and Processing,the Ministry of Education,Lanzhou University of Technology,Lanzhou 730050)

机构地区：[1]兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室,兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,兰州730050

出　　处：《特种铸造及有色合金》2025年第2期293-298,共6页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划资助项目(2018YFB2001802)。

摘　　要：以纯Al为母合金1,Al-12Si为母合金2,在一定的质量比和温度下,采用受控扩散凝固(CDS)的方法得到目标合金Al-8Si。采用数值模拟和试验验证相结合的方法对混合熔体的流场、温度场、溶质场和形核率以及试验所得铸件的初生α-Al相尺寸、形状进行分析。结果表明,浇注距离对两种母合金混合效果产生影响,在浇注距离过小或过大时,混合熔体的溶质场和温度场都不均匀,形核率较低,试验所得铸件的初生α-Al晶粒粗大且不规则。浇注距离为80 mm时,混合效果最好,温度场、溶质场最均匀且形核率最高,初生α-Al相的晶粒尺寸和形状因子分别为57.6μm和1.55。The target alloy Al-8Si was obtained by controlled diffusion(CDS)using pure Al as precursor alloy 1 and Al-12Si as precursor alloy 2 at a certain mass ratio and temperature,and the flow field,temperature field,solute field and nucleation rate of the melt,as well as the experimental grain size and shape of the primaryα-Al were analyzed by combination of numerical simulation and experimental verification.The results reveal that the casting distance affects the mixing effect of both master alloys,and when the casting distance is excessive or insufficient,the solute field and temperature field of the mixed melt are heterogeneous with lower nucleation rate,and the primaryα-Al presents coarse and irregular grains.When the casting distance is 80 mm,the mixing effect is desirable,and temperature field and sol⁃ute field are the most uniform with the highest nucleation rate,where the average grain size and shape factor of the pri⁃maryα-Al are 57.6μm and 1.55,respectively.

关 键 词：受控扩散凝固(CDS) AL-SI合金 浇注距离 形核率 初生Α-AL 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG246[金属学及工艺—金属材料]