Abstract
Dry, lubrication (SAE15W40), and coated (DLC-Star) reciprocating tribological tests on rapid solidified AlSi17Cu3.5-4Mg0.6-0.8 alloy was conducted using a high frequency linear reciprocating rig (HFRR) at ambient temperature. The alloy fabricated with the rheo-stir squeeze casting procedure under T-6 condition. However, at different loading (0-30 N) conditions, wear and friction properties of rapid solidified H-Al-17Si alloy are investigated. It is observed that the lower friction coefficient value obtained for DLC-Star coated H-Al-17Si alloy compared to dry and lubrication conditions. Though, for dry and lubricated sliding, the obtained wear coefficient values are 2.9X10-3 mm3/N.m and 4.0X10-4 mm3/N.m. A lower coefficient of wear value of 5.4X10-5 mm3/N.m was recorded with DLC-star coating under dry conditions. The alloy wear coefficient values first increases with applied load (up to 20 N) and then decreases (20 N to 30 N). EDS, AFM surface roughness profilometer, SEM, and advanced metallurgical microscope (AMM) analysis techniques used for the characterization of surface morphologies. The developments in friction and wear coefficients were fundamentally ascribed to the dispersion and size of primary Si elements and the development of tribo-oxide films on the rapid solidified AlSi17 alloy coated (DLC-Star) surfaces.
Highlights
Poor tribological characteristics of an alloy show higher emissions, more energy consumption, and a high rate of wear
A constant friction coefficient value of 0.064, and 0.023 was obtained in the case of SAE15W40 lubricating oil and Diamond-Like Carbon (DLC)-Star coating. It is evident from the above results (Fig. 7.) that the lowest friction coefficient value of 0.023 was achieved in the case of DLC-Star coating condition compared to dry (0.41) and lubricated (0.064) sliding conditions
At the beginning of the experiment, the highest COF (Fig. 7) is recorded at 5 N load due to the H-Al-17Si metal matrix composites (MMC) plate asperities that come into direct contact while sliding and stick to the AISI52100 ball surface which results in increased friction coefficient
Summary
Poor tribological characteristics of an alloy show higher emissions, more energy consumption, and a high rate of wear. Scholars have evolved many tribological resolutions in terms of multi-grade lubricants, reduced weights of metal matrix composites (MMC), and advanced protective coatings to produce high-performance mechanical system components to improve efficiency, reduce emission, wear and friction losses [2,3,4]. The use of ultrasonic vibration [15] during the stirring of H-Al-Si MMCs and squeeze is a comparatively latest process It is a userfriendly technique with the benefits of low cost and simple operability [16,17,18,19]
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