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research-article

Dry Sliding Wear Behavior of 2218 Al-Alloy-Al2O3(TiO2) Hybrid Composites

[+] Author and Article Information
Vineet Tirth

Research Center for Advanced Materials Science (RCAMS), King Khalid University, PO Box 9004, Abha-61413, Asir, Saudi Arabia
vtirth@kku.edu.sa
v.tirth@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4037697 History: Received April 24, 2017; Revised August 06, 2017

Abstract

AA2218-Al2O3(TiO2) composites are synthesized by stirring 2, 5 and 7 wt% of 1:2 mixture of Al2O3:TiO2 powders in molten AA2218 alloy. T61 heat-treated composites characterized for microstructure and hardness. Dry sliding wear tests conducted on pin-on-disc set-up at available loads 4.91 N to 13.24 N, sliding speed of 1.26 m/s up to sliding distance of 3770m. Stir cast AA2218 alloy (unreinforced, 0 wt% composite) wears quickly by adhesion, following Archard's law. Aged alloy exhibits lesser wear rate than unaged (solutionized). Mathematical relationship between wear rate and load proposed for solutionized and peak aged alloy. Volume loss in wear increases linearly with sliding distance but drops with increase in particle wt% at a given load, attributed to increase in hardness due to matrix reinforcement. Minimum wear rate is recorded in 5 wt% composite due to increased particles retention, lesser porosity and uniform particle distribution. In composites, wear phenomenon is complex, combination of adhesive and abrasive wear which includes the effect of shear rate, due to sliding action in composite, and abrasive effect (3 body wear) of particles. General mathematical relationship for wear rate of T61 aged composite as a function of particle wt%, load is suggested. Fe content on worn surface increases with increase in particle content and counterface temperature increases with increase in load. Coefficient of friction decreases with particle addition but increases in 7 wt% composite due to change in microstructure.

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