Wear Behavior and Microstructure Characteristics of A۳۵۶/ZrO۲+Al۲O۳ Hybrid Composite

Improving wear resistance is the most crucial property expected from metal matrix composites (MMCs). Inthis study, wear parameters, i.e., weight loss, wear rate, and friction coefficient of A۳۵۶/ZrO۲+Al۲O۳ with and withoutbismuth were evaluated using a pin-on-disc test. Hybrid composites were manufactured using the vortex technique inwhich reinforcement particles were added in the semi-solid state at ۶۰۵±۵ oC. Results show that ZrO۲ and Al۲O۳reinforcements were successfully embedded in the A۳۵۶ matrix. The distribution of particles was more uniform in theBi-containing composite. Bismuth addition improves wear characteristics in which weight loss, wear rate, and frictioncoefficient were measured at ۰.۰۰۱۴ g, ۰. ۱۹ mm۳/m, and ۰.۲۸, respectively. This can be related to the intrinsic role ofbismuth lubrication and reducing the melt's surface tension. Abrasive and adhesive wear mechanisms were observedon the worn surfaces of fabricated composites.

کلیدواژه ها:

Hybrid composite ، Wear ، ZrO۲ ، Al۲O۳