期刊
CRYSTALS
卷 13, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/cryst13050722
关键词
ultrasonic treatment; wear; metal matrix composite; dispersion; reinforcement
Metal matrix nanocomposites (MMNCs) are gaining popularity in engineering and medical applications for their superior properties, particularly aluminum-based composites. Reinforcing aluminum alloys with ceramics, carbon allotropes, etc., can significantly improve their wear resistance. In this study, an aluminum alloy A356/SiO2 nanocomposite was fabricated using a vibration-assisted casting process. The addition of 0.125 wt.% of nanosilica resulted in the highest increase in hardness and the greatest reduction in friction coefficient and wear rate by 52%, 50%, and 68%, respectively.
Metal matrix nanocomposites (MMNCs) are becoming the materials of choice in a variety of engineering and medical applications owing to their exhibiting a superior combination of targeted properties. Amongst different MMNCs, aluminum-based composites are of special importance. In many applications, a relatively inferior wear property limits the use of this valued metal in practice. However, reinforcing aluminum and its alloys by ceramics, carbon allotropes, etc., may circumvent these limitations to a great extent. In the present study, aluminum alloy A356/SiO2 nanocomposite is fabricated by a vibration-assisted casting process, wherein varied amount of nanosilica, namely, 0.125, 0.25, and 0.375 wt.%, have been added to the melt. The use of power ultrasonic treatment had a great influence on the microstructure, hardness, and wear properties. Microstructural and XRD analyses were performed on the fabricated monolithic and composite samples. To evaluate wear behavior, a hardness test and pin-on-disk experiment were conducted on the samples under 60, 80, and 100 N forces at a constant speed of 1 m/s and the sliding distance was varied from 1000 to 2000 m. The abraded surfaces, wear debris, and EDS analysis were used to identify wear mechanisms. The samples having 0.125 wt.% exhibited the highest increase in hardness and the highest reduction in both friction coefficient and wear rate by 52%, 50%, and 68%, respectively. The main governing wear mechanism was abrasion, with limited evidence of delamination.
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