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This article investigates the effects of heat treatment applied to AZ91 magnesium alloys on wear behavior under different loading conditions. Apart from as-cast AZ91 alloy, AZ91 alloy samples were subjected to both solid- solution treatment (400°C for 16 hours) and three other aging processes (216°C for 4, 8, and 12 hours) under three different applied loads (10 N, 25 N and 50 N). Under various applied loads, microstructural, characteristics, hardness, friction coefficient, and specific wear rate behavior were examined. In all samples, the specific wear rate increased with the applied load, while the friction coefficient decreased. The highest specific wear rate was observed in a solid-solution treated sample, but the specific wear rate changed inversely with aging time. Furthermore, the microhardness increased in direct proportion to aging time. The results indicated that the sample that was aged for 12 hours wore 13.6% less under 10 N load than the sample that was only treated with solid solution, but the same sample wore 25% less under 50 N load. Microhardness was increased with the increase in β-precipitates, while wear decreased with the increase in hardness. |
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