Effect of Mn and Fe element content proportion on microstructure of Al-Si-Fe alloys

The Al-Si-Fe alloys with different content ratios of Mn to Fe were fabricated.Metalloscope and scanning electron microscope have been employed to study the influence of element content proportion on microstructure of the Al-Si-Fe alloys.The results show that Fe element can prompt the precipitation of the coarse iron-rich β-Al_5FeSi phase,while Mn can effectively refine microstructure of the alloy.When the (content) proportion of Mn and Fe comes to 1: 1.5,the acicular β-Al_5FeSi phase convert into fine particles or short lamellar Al_(85)(Mn_(0.72)Fe_(0.28))14Si pahse.