Needle Like Fe-Containing Intermetallic Compounds of High Silicon Aluminum Alloy with Fe Modified by Mn and Ultrasonic Vibration

Abstract:

In this study, the modification effects and mechanism of manganese (Mn) and ultrasonic vibration (USV) on the needle-like Fe-containing intermetallic compounds of Al-20Si-xFe-2.0Cu-0.4Mg-1.0Ni (x=1, 2 wt.%) alloy have been studied respectively. The effect of Fe-containing phases on volume fraction of hard phases is also investigated. The results show that the mechanism and effect of Fe-containing intermetallic compounds improved by Mn are in close relationship with Fe content. Mn can promote to form less harmful α-Al₁₅(Fe,Mn)₃Si₂ phase, or replace some Fe atoms of β-Al₅FeSi and δ-Al₄FeSi₂ according to different Fe content. When USV was applied to this alloy containing 2%Fe near liquidus temperature, most of the acicular β phases formed in traditional process are substituted by fine plate δ phases. With the combined effects of 0.5%Mn and USV, the acicular β phases are almost repressed and the Fe-containing phases exist in form of fine Al₄(Fe,Mn)Si₂ and Al₅(Fe,Mn)Si particles about 20~30μm. Consequently, the total volume fraction of hard phases which are composed of primary silicon particles and Fe-containing phases increases significantly.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 2286-2292
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.2286
• Online since: November 2016
• Authors: Gu Zhong*, Shu Sen Wu, Chong Lin, Hiromi Nagaumi
• Keywords: Fe-Containing Phase, High Silicon Aluminum Alloy, Manganese, Mechanism, Ultrasonic Vibration, Volume Fraction

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