Al-Si alloys that are intended for extended durability applications during sliding contact -like the piston-cylinder block assembly in automotive engines- must operate under ultra-mild wear (UMW) conditions. A near-eutectic Al-11 wt% Si and a hypereutectic Al-19 wt% Si of different particle sizes but with a similar Si particle morphology were chemically etched, then, subjected to lubricated sliding tests under light loading (0.5N) conditions that correspond to the UMW regime. The wear processes included pressing the hard particles against the contact surface and embedding them into the Al matrix causing plastic flow and formation of pile-ups near the particles. The elevated portions of the matrix were then worn by the counterface.
- Tribology Division
Ultra-Mild Wear of Aluminum Alloys: Role of Silicon Particles
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Chen, M, & Alpas, AT. "Ultra-Mild Wear of Aluminum Alloys: Role of Silicon Particles." Proceedings of the STLE/ASME 2006 International Joint Tribology Conference. Part A: Tribomaterials; Lubricants and Additives; Elastohydrodynamic Lubrication; Hydrodynamic Lubrication and Fluid Film Bearings; Rolling Element Bearings; Engine Tribology; Machine Components Tribology; Contact Mechanics. San Antonio, Texas, USA. October 23–25, 2006. pp. 557-558. ASME. https://doi.org/10.1115/IJTC2006-12350
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