, Volume 45, Issue 24, pp 6849-6852
Date: 06 Oct 2010

Effect of sliding environment on dry sliding wear of as-cast eutectic Al–Si

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Wear resistance has been found to improve for Al–Si alloys with increasing silicon content up to the eutectic composition (12.6 at.% Si), after which it deteriorates [13]. Wear in Al–Si alloys has been characterized into mild and severe wear regimes. Mild wear occurs under conditions of low normal loads, and an oxide layer that forms on the wear surface usually slows down the wear process. Severe wear occurs under high normal loads and is often characterized by inclusions of the worn counterface, along with oxides, in the mechanically mixed surface tribolayers [4, 5]. The results of Razavizadeh and Eyre [6] suggest that there is generally insufficient frictional heating on the wear surface for general oxide formation. Instead, a mechanism of oxidation of asperities followed by fracture and compaction of these oxidized asperities into the valleys on the metal wear surface has been suggested [7, 8]. During mild wear of Al–Si alloys, a smooth surface is generally observed with interspace