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