Abstract
In the present study, hybrid metal matrix composites, Al2024/10Al2O3, Al2024/10Al2O3/3MgO, Al2024/10Al2O3/6MgO, Al2024/10Al2O3/3MgO/1.5 Gr, Al2024/10Al2O3/3MgO/3Gr, and reinforcement samples (AA 2024) produced with powder metallurgy process. AA 2024 and reinforcement powders were determined mixture rations and separately mixed during 30 minutes in a three-dimensional Turbula mixer. The mixed compositions were pressed at 300 MPa and sintered at 550°C during 1 h. After that, three materials were extruded at the same temperature. Experimental results show that hybrid metal matrix composites (HMMCs) a better wear resistance than the reinforcement samples because of higher hardness. Gr behave as a lubricant during wear process. The wear resistance of HMMCs can be optimized with controlling of the reinforcement content and type.
Highlights
Metal matrix composites (MMCs) reinforced with harder particles have been extensively used in automotive and aerospace industries because of their superior mechanical properties
Gr are used in the MMCs as lubricator [1-3].Adding of Gr significiantly improve wear performance of MMCs
Basavaraja et al (2006) investigated the dry friction wear behavior of hybrid composites. They reported that the wear resistance increased with the increase of SiCp and graphite % wt and the wear rate decreased with increasing SiC % wt [5]
Summary
Metal matrix composites (MMCs) reinforced with harder particles have been extensively used in automotive and aerospace industries because of their superior mechanical properties. In a study by Al-Rubaie, increasing in reinforcement size of Al-SiC composites improved wear resistance [4]. Basavaraja et al (2006) investigated the dry friction wear behavior of hybrid composites. They reported that the wear resistance increased with the increase of SiCp and graphite % wt and the wear rate decreased with increasing SiC % wt [5]. Basavarajapa et al fond that using of graphite particles in aluminum matrix improve wear resistance and form a lubricant layer between the friction surfaces [7]. B4C on the wear performance and mechanical properties of Al 7075-B4C composites were investigated by Baradeswaran and Elaya Perumal. The effects of reinforcement type and % wt. content, (Al6061), (%12B4C), (%12SiC), (%9B4C+%3SiC), (%6B4C+%6SiC) ve (%3B4C+%9SiC),on the abrasive wear performance of Al2024 hybrid matrix composites produced with hot pressing methods were investigated
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