过渡元素Mn、Cr、Zr对Al-7Si-0.35Mg铸造合金组织和力学性能的影响  

Effect of transition elements Mn,Cr,Zr on the microstructure and mechanical properties of Al-7Si-0.35Mg casting alloys

作　　者：梁帅 陈来 朱慧颖 长海博文 LIANG Shuai;CHEN Lai;ZHU Huiying;NAGAUMI Hiromi(Weiqiao Suzhou Lightweight Research Institute Co.,Ltd.,Suzhou 215000,China;Soochow University,Suzhou 215000,China)

机构地区：[1]魏桥苏州轻量化研究院有限公司,江苏苏州215000 [2]苏州大学,江苏苏州215000

出　　处：《轻合金加工技术》2024年第3期20-29,共10页Light Alloy Fabrication Technology

摘　　要：本试验主要研究微量过渡元素Mn、Cr、Zr对Al-7Si-0.35Mg铸造合金组织和力学性能影响.根据相图和"污泥"形成的条件,初步确定过渡族元素的添加量.采用Jmat Pro模拟不同成分合金的凝固过程,并与实际凝固组织进行对比.结果表明,添加Mn、Cr基本消除了针状β-Al_(5)FeSi相,将该相转变为汉字状α-Al(Fe,Mn,Cr)Si相;添加Zr元素不改变初生Fe相的类型和形貌,使合金中出现少量针状Al-Si-Zr-Ti相,对合金的塑性产生不利的影响;Mn、Cr、Zr单独或组合添加后,对合金的共晶区和共晶硅面积分数基本没有影响;Mn、Cr复合添加和Mn、Cr、Zr复合添加可以使合金获得良好的力学性能.The microstructure and mechanical properties of Al-7Si-0.35Mg casting alloys were studied with addition of trace transition elements Mn,Cr and Zr.The transition element addition was preliminarily determined based on phase diagram and sludge formation condi-tions.The solidification process with different compositions were simulated with Jmat Pro and compared with the actual solidification structure.The addition of Mn and Cr basically elimi-nated the needle-likeβ-Al_(5)FeSi phase and transformed it into a Chinese-character-likeα-Al(Fe,Mn,Cr)Si phase.The addition of Zr did not change the type and morphology of the pri-mary Fe phase,and a small amount of needle-like Al-Si-Zr-Ti phase appeared in the alloy,which was not conducive to the plasticity.The addition of Mn,Cr,and Zr alone or in combi-nation had little effect on the eutectic zone and eutectic silicon area fraction.Combined addi-tion of Mn and Cr and combined addition of Mn,Cr,Zr will lead to good mechanical proper-ties.

关 键 词：过渡元素 Al-7Si-0.35Mg铸造合金 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]