La对Sr变质A356铝合金铸态组织与力学性能的影响  

Effects of La on As-cast Microstructure and Properties of Sr Modified A356 Alloy

作　　者：何兵 覃铭[1,2,3] 石伟和 古斌[1,2,3] HE Bing;QIN Ming;SHI Weihe;GU Bin(School of Material Science and Engineering,Baise University,Baise 533000;College of Ecological Aluminum Industry,Baise University,Baise 533000;Engineering Research Center of Advanced Aluminum Matrix Materials of Guangxi Province,Baise 533000)

机构地区：[1]百色学院材料科学与工程学院,百色533000 [2]百色学院生态铝产业学院,百色533000 [3]广西壮族自治区铝基新材料工程研究中心,百色533000

出　　处：《特种铸造及有色合金》2024年第12期1664-1668,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51961001)。

摘　　要：研究不同含量Sr、La对A356合金铸态组织与力学性能的影响。通过电阻炉熔铸合金,运用XRD、金相显微镜、扫描电镜对铸态组织、断口进行观测,并结合力学性能测试进行分析。结果表明,Sr+La组合能有效地细化变质A356合金铸态组织,达到提高其力学性能的效果。其中,添加0.05%的Sr+0.3%的La对合金组织的细化变质及力学性能的改善效果最佳;当La添加量达到0.5%后,铸态组织出现富La粗大相,降低其力学性能。Effects of different Sr and La contents on as-cast microstructure and mechanical properties of A356 aluminum alloy were investigated.A356 aluminum alloy was melted in electric furnace,and the as-cast microstructure and fracture morphologies were characterized by XRD,metallographic microscopy,and scanning electron microscopy,meanwhile mechanical properties were analyzed.The results indicate that the combination addition of Sr+La can effectively refine as-cast structure of A356 aluminum alloy,achieving the improvement of mechanical properties,and the optimal refinement and modification are realized with 0.05%Sr+0.3%La addition.However,when the amount of La exceeds 0.5%,coarsened La-rich phases appear,which is harmful to mechanical properties.

关 键 词：A356铝合金 变质 力学性能 断口形貌 

分 类 号：TG146.21[一般工业技术—材料科学与工程]