稀土Ce对ZL114A铝合金凝固组织的影响  

Effect of Rare Earth Ce on Solidification Microstructure of ZL114A Aluminum Alloy

作　　者：冯艳飞 麻永林[1] 邢淑清[1] 王军 鲍鑫宇 刘永珍 FENG Yan-fei;MA Yong-lin;XING Shu-qing;WANG Jun;BAO Xin-yu;LIU Yong-zhen(School of Materials Science and Engineering,Inner Mongolia University of Science&Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料科学与工程学院,内蒙古包头014010

出　　处：《稀有金属与硬质合金》2025年第2期62-68,共7页Rare Metals and Cemented Carbides

基　　金：内蒙古自治区科技计划项目(2021GG0096);内蒙古科技大学基本科研业务费专项资金资助项目(2023RCTD004)。

摘　　要：采用砂型铸造工艺模拟实验,分析稀土Ce对ZL114A铝合金的凝固组织中α-Al晶粒尺寸、共晶Si形貌、物相组成及硬度的影响。结果表明:随着稀土Ce添加量的增加,ZL114A铝合金凝固组织的α-Al晶粒尺寸呈先减小后增大的趋势,而合金维氏硬度呈先升高后降低的相反趋势。最佳稀土Ce质量分数为0.3%,在此条件下铸锭心部和边部平均晶粒尺寸由原始的157μm和143.2μm分别减小至125.7μm和122.6μm,分别降低了19.9%和14.4%;共晶Si形貌由原来的板条状变为细小的短棒状,且添加稀土Ce促进了合金中Al和Si原子沿〈100〉和〈110〉方向的择优取向生长;铸锭心部和边部的维氏硬度值由原始的62.9 HV和68.3 HV分别升至70.3 HV和75.3 HV,分别提高了11.8%和10.2%。The influence of rare earth Ce on theα-Al grain size and eutectic Si morphology in the solidification microstructure,phase composition,and hardness of ZL114A aluminum alloy was investigated through a sand casting process simulation experiment.The results indicate that theα-Al grain size in the solidification microstructure of ZL114A aluminum alloy initially decreases and subsequently increases with the increase of the addition amount of rare earth Ce,while the Vickers hardness of the alloy exhibits an opposite trend of first increasing and then decreasing.The optimum mass fraction of rare earth Ce is 0.3%.Under this condition,the average grain sizes at the core and edge of the ingot decrease from the original 157μm and 143.2μm to 125.7μm and 122.6μm,respectively,corresponding to decreases of 19.9%and 14.4%.The morphology of eutectic Si transforms from the original lath shape to fine rod shape.Additionally,the addition of rare earth Ce promotes the preferred orientation growth of Al and Si atoms along the〈100〉and〈110〉directions.The Vickers hardness values at the core and edge of the ingot increase from the original 62.9 HV and 68.3 HV to 70.3 HV and 75.3 HV,respectively,corresponding to enhancements of 11.8%and 10.2%.

关 键 词：稀土Ce ZL114A铝合金 凝固组织 共晶Si 晶粒细化 硬度 

分 类 号：TG292[金属学及工艺—铸造]