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research-article

Effect of bifilm oxides on the dry sliding wear behavior of Fe-rich Al-Si alloys

[+] Author and Article Information
N. Akaberi

Department of Materials Science and Ceramic Engineering, Imam Khomeini International University (IKIU), Qazvin, IRAN
rteemail@gmail.com

R. Taghiabadi

Department of Materials Science and Ceramic Engineering, Imam Khomeini International University (IKIU), Qazvin, IRAN
taghiabadi@ikiu.ac.ir

A. Razaghian

Department of Materials Science and Ceramic Engineering, Imam Khomeini International University (IKIU), Qazvin, IRAN
razaghian_ahmad@ikiu.ac.ir

1Corresponding author.

ASME doi:10.1115/1.4035340 History: Received August 12, 2016; Revised November 10, 2016

Abstract

The effect of bifilm oxides on the dry sliding wear behavior of Fe-rich (1.5 wt%) F332 Al-Si alloy under as-cast and T6 heat-treated conditions was investigated. Toward this end, the surface oxides were intentionally incorporated to the molten alloy through surface agitation. The results show that the presence of bifilms increased the wear rate of the base (0.2 wt% Fe) and 1.5 wt% Fe-containing alloys by almost 22 and 14%, respectively, after sliding under the applied load of 75 N. The results also proved that, despite the positive effect on the hardness, T6 heat treatment adversely affects the wear resistance of the alloys made under surface turbulence condition. This negative effect was attributed to the expansion of bifilms during heat treatment, which are converted to the potential sites for initiation and propagation of subsurface micro-cracks. The strengthening effect exerted by thermally modified β-Al5FeSi platelets, however, was demonstrated that could compensate the negative effects of bifilm oxides on the wear behavior of 1.5wt% Fe-containing F332-T6 alloy, which showed an improvement of about 5% on its wear under the applied load of 75N.

Copyright (c) 2016 by ASME
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