Er和Sr共同作用对A356铝合金铸态组织和力学性能的影响  

Combining Effect of Er and Sr on Microstructure and Mechanical Properties of As-casted A356 Alloy

作　　者：陈志强 贾锦玉 胡文鑫[1,2] 王玮 王小青[1,2] Chen Zhiqiang;Jia Jinyu;Hu Wenxin;Wang Wei;Wang Xiaoqing(State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014030,China;Baotou Research Institute of Rare Earths,Baotou 014030,China)

机构地区：[1]包头稀土研究院白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古包头014030 [2]包头稀土研究院,内蒙古包头014030

出　　处：《稀有金属材料与工程》2020年第10期3388-3394,共7页Rare Metal Materials and Engineering

基　　金：National Key Research and Development Program(2016YFB0101205)。

摘　　要：通过制备Al-10Er-5Sr中间合金并分析其微观组织和相成分,以研究Er和Sr共同作用对A356铝合金微观组织和力学性能的影响。根据微观组织的发展和力学性能的变化,确定了Al-10Er-5Sr中间合金在A356铝合金中的最佳含量。研究结果表明:Al-10Er-5Sr中间合金主要由α-Al,Al4Sr和Al3Er相组成。A356铝合金中加入质量分数0.6%的Al-10Er-5Sr合金后展示了最优的组织和力学性能,其中合金的二次枝晶臂间距减小到20.2μm,针状共晶硅向纤维状共晶硅转变。由于微观组织的改善,加入0.6%的Al-10Er-5Sr的A356合金抗拉强度提高到了203.5 MPa,与未添加中间合金相比,性能明显提高。对晶粒细化和变质机理进行了分析和讨论。In order to investigate the combing effect of Er and Sr on the microstructure and mechanical properties of A356 alloy,Al-10Er-5Sr master alloy was fabricated and its microstructure and phase compositions were investigated.The optimal content of Al-10 Er-5 Sr in A356 alloy was obtained according to the evolution of microstructure and mechanical properties.The results show thatα-Al,Al4Sr and Al3Er are the main phases in Al-10 Er-5 Sr.In addition,the aluminum alloy with 0.6 wt%Al-10 Er-5 Sr exhibits optimal microstructure and mechanical properties,with the secondary dendrite arm spacing(SDAS)decreasing to 20.2μm and acicular-like eutectic silicon transforming to fibrous.Due to the improved microstructure,the ultimate tensile strength of the alloy(with 0.6 wt%Al-10 Er-5 Sr)increases to 203.5 MPa,which is much better than that of untreated A356 aluminum alloy.Finally,the grain refinement and modification mechanisms were discussed.

关 键 词：Al-10Er-5Sr中间合金 变质和晶粒细化 共同作用 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]