نوع مقاله : علمی و پژوهشی
نویسنده
گروه مهندسی مواد- دانشکده مکانیک-دانشگاه تبریز- تبریز-ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
The purpose of this research is to investigate the microstructure and wear behavior of AlA380 alloy nanocomposite reinforced with graphene nanoplates (GNPs) and SiC nanoparticles produced by ball milling and spark plasma sintering furnace (SPS). The percentage of SiC nanoparticles was fixed and the percentage of graphene nanosheets was considered variable. Graphene nanosheets with percentages of 0.25, 0.5, 0.75 and 1% by and SiC nanoparticles at 0.5% by weight were added to the nanocomposite. The presence of dispersed GNPs with high specific surface area significantly increases the strength and hardness of composites. Microstructural studies of the alloy showed that the addition of GNPs up to 0.5 wt% reduced the grain size, but the addition of a higher amount of GNPs (1 wt%) did not significantly change the grain size. At higher GNP values, the presence of graphene agglomerates at the grain boundaries is a favorable path for crack growth. The optimal amount of nanosheets was 0.5% by weight. The wear resistance of the produced nanocomposites is higher than the base sample and the weight reduction of the base sample is 3 times compared to the optimal sample. Due to the self-lubricating nature of graphene, the friction coefficient for the base sample and the nanocomposite containing 0.5% by weight of graphene is 0.689 and 0.455, respectively, which indicates a reduction in the friction coefficient. Also, the hardness of the samples increases from 105 Vickers for the base sample to 175 Vickers for the sample containing 0.5% by weight of graphene.
کلیدواژهها [English]
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