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
梁帅 1陈来 1朱慧颖 1长海博文2
作者信息
- 1. 魏桥苏州轻量化研究院有限公司,江苏 苏州 215000
- 2. 魏桥苏州轻量化研究院有限公司,江苏 苏州 215000;苏州大学,江苏 苏州 215000
- 折叠
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-Al5FeSi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.
Abstract
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-like β-Al5 FeSi phase and transformed it into a Chinese-character-like α-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Key words
transition element/Al-7Si-0.35Mg cast alloy/microstructure/mechanical properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据