Abstract
Mechanical and machinability properties of intermittently reinforced aluminium alloy metal matrix composite is a difficult phenomenon as related to monolithic materials and is still not clearly understood. In the present research work, the effect of reinforcements on microstructure, tensile strength and machining characteristics in Al7075 metal matrix composites (MMCs) is investigated. Al7075 alloy hybrid MMCs were developed through metallurgical route. Various weight percentages of nano-sized SiC (2%, 3% and 4%) and nano-sized Al2O3 (1%, 1.5% and 2%) were reinforced with Al7075 alloy during the stir casting process. The samples were matured for 5 h at various temperatures (120 °C, 140 °C and 160 °C) and then cooled at 27 °C. The porosity and density of the nano hybrid composites were found to be enhanced. The ultimate tensile of the hybrid MMCs could be enhanced by addition of ceramic particulates compared to monolithic. Machinability of the hybrid composites was examined using “L27” orthogonal array testing. Three varying parameters, including 0.1 mm/min feed rate, 0.2 mm/min depth of cut and spindle speed of 1500 rpm, were chosen. Obtained results show that, machining force and surface roughness (Ra) of the developed nano-MMCs decrease with increasing ageing temperature and increased with wt. % of nano-sized Al2O3/SiC. Best cutting force and Ra values were obtained at 2% SiCp + 1% Al2O3 and 160 °C of ageing temperature.
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The authors are thankful to B M S Evening College of Engineering, India for the encouragement and support in carrying out the research work.
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MRK conducted the experimentations work and manuscript prepared. RS supported for the Design of Experimentation techniques and analyze the results.
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Ravikumar, M., Suresh, R. Study on mechanical and machinability characteristics of n-Al2O3/SiC-reinforced Al7075 composite by design of experiment technique. Multiscale and Multidiscip. Model. Exp. and Des. 6, 747–760 (2023). https://doi.org/10.1007/s41939-023-00179-4
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DOI: https://doi.org/10.1007/s41939-023-00179-4