Effect of Manganese on the Fe-Rich Phases in Al-22Si-2Fe Alloy by Cooling Slope

Abstract:

Hypereutectic Al-Si alloys have low thermal expansion coefficients, excellent wear resistance, and high hardness. To replace cast iron with hypereutectic Al-Si alloys, the hypereutectic Al-Si alloys must still have the originally desired mechanical properties. The addition of Fe and Mn to the hypereutectic Al-Si alloys can form Fe-rich phases, which can improve thermal stability. In this paper, the effect of manganese (0 %, 0.99 %, and 1.36 %) on the Fe-rich phases of hypereutectic Al-22Si-2Fe (% w/w) alloys was studied. The results showed that primary Si particles (PSPs), needle-like Fe phases, a coarser fishbone-shaped α-Al₁₅(Fe, Mn)₃Si₂ phases, and eutectic Si could be refined by cooling slope. With such a CS process, the intermetallic compounds in the alloys with different Mn/Fe ratios were examined with an optical microscope, scanning electron microscope, and X-ray diffraction. Moreover, the blocky α-Al₁₅(Fe, Mn)₃Si₂ phases were analyzed by transmission electron microscopy. Through the analysis of the SADP, the lattice structures of α-Al₁₅(Fe, Mn)₃Si₂ phases were identified with tetragonal structure and body centre cubic.

• Periodical: Solid State Phenomena (Volumes 217-218)
• Pages: 37-44
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.217-218.37
• Online since: September 2014
• Authors: Ye Hua Jiang, Lu Li, Rong Zhou, Rong Feng Zhou*, Jia Wang
• Keywords: Cooling Slope, Hypereutectic Al-Si Alloy, Intermetallic Compound, Mn/Fe Ratio

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