Mg、Ce、Sr复合微合金化对A356铝合金组织和性能的影响  

Effect of Mg,Ce,Sr Composite Microalloying on Microstructure and Properties of A356 Aluminum Alloy

作　　者：徐远财 李广宇[1] 蒋文明[1] 管峰[1] 张政[1] 樊自田[1] XU Yuan-cai;LI Guang-yu;JIANG Wen-ming;FAN Zi-tian(School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)

机构地区：[1]华中科技大学材料成形与模具技术全国重点实验室,湖北武汉430074

出　　处：《铸造》2023年第9期1147-1151,共5页Foundry

基　　金：国家自然科学基金项目资助(52271102,52075198);国家重点研发计划项目资助(2020YFB2008304);新金属材料国家重点实验室开放课题重点基金资助(2021-ZD07)。

摘　　要：通过金相显微镜、扫描电镜、透射电镜、拉伸试样机等分析手段研究了Mg、Ce、Sr等元素复合添加对A356合金微观组织和力学性能的影响。结果表明,多元素复合添加对A356铝合金的细化和变质效果较好,α-Al相尺寸减小,共晶硅也由针片状转变为颗粒状或短杆状。添加0.25%Mg、0.2%Ce、0.015%Sr后合金的抗拉强度、屈服强度、伸长率分别为345 MPa、289 MPa、7%。变质后合金的断裂以韧性断裂为主。The effects of compound addition of Mg,Ce and Sr on the microstructure and mechanical properties of A356 alloy were studied by means of metallographic microscope,scanning electron microscope,transmission electron microscope and tensile testing machine.The results show that the compound addition of multi-elements has a better effect on the refinement and modification of A356 aluminum alloy.The size ofα-Al phase decreases,and the eutectic silicon also changes from needle flakes to granular or short rods.The tensile strength,yield strength and elongation of the alloy after adding 0.25%Mg,0.2%Ce and 0.015%Sr are 345 MPa,289 MPa and 7%.The fracture of the alloy after modification is mainly ductile fracture.

关 键 词：A356铝合金 α-Al 共晶硅 组织细化 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]