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  • articleNo Access

    EXPERIMENTAL INVESTIGATION OF TRIBOLOGICAL CHARACTERISTICS ON AA7068–ZrB2IN-SITU AMCs

    In the present era, aluminum-based metal matrix composites, commonly known as aluminum matrix composites (AMCs), play a crucial role in fabricating lighter weight components in the aerospace, automotive, aircraft and marine industries. Intensive research is required to fabricate AMCs economically. In this recent research, AA7068–ZrB2 AMCs were successfully produced using the in-situ method of fabrication. The inorganic salts such as K2ZrF6 and KBF4 reacted with molten aluminum at 850C and formed ZrB2 particles in the aluminum melt itself. The castings of AA7068–ZrB2 AMCs were obtained with 0, 3, 6 and 9 volume fractions (vol.%) of ZrB2in-situ particles. The pin-on-disc wear apparatus was used to conduct the dry sliding wear analysis of AA7068–ZrB2in-situ AMCs. The wear experiments were conducted in line with the Design of Experiments (DoE). An orthogonal array of L16 was employed for the DoE. The effects of wear parameters such as vol.% of ZrB2 particles, sliding speed, sliding distance and normal load on the wear rate (WR) and coefficient of friction (COF) were observed. The effects of individual parameters on the WR and COF were observed by contour plot, residual plot and Analysis of Variance (ANOVA). The worn surfaces of AA7068–ZrB2 (0, 3, 6 and 9 vol.%) AMCs were also observed using the field-emission scanning electron microscopy (FESEM).

  • articleNo Access

    EVALUATION OF METALLURGICAL CHARACTERIZATION AND MECHANICAL PROPERTIES OF AA7075/ZrB2IN SITU AMCs AFTER FRICTION STIR PROCESSING

    Many researchers have attempted to join Aluminum Matrix Composites (AMCs) using traditional fusion welding processes resulting in the formation of porosity, segregation, coarse microstructure, brittle intermetallic compounds and corrosion of ceramic particles. Friction Stir Processing (FSP) is the latest solid-state technique to achieve the homogeneous dispersion of reinforcement particles in the friction stir processed zone of AMCs [M. Shamanian, E. Bahrami, H. Edris and M. R. Nasresfahani, Surf. Rev. Lett.25 (2018) 1950010]. The most widely used reinforcing material since the inception of FSP is inorganic (metallic) powders such as silicon carbide, titanium alloy, graphene, iron, stainless steel, nitrides and oxides, and fewer works have been reported on organic powders (i.e. bioprocessing using agro-waste powders) such as fly ash, palm kernel shell ash, coconut shell ash and rice husk ash [O. M. Ikumapayi, E. T. Akinlabi, S. K. Pal and J. D. Majumdar, Procedia Manuf.35 (2019) 935]. In this work, the effect of FSP on the changes in metallurgical characterization and mechanical properties of AA7075/(3, 6 and 9) vol.% ZrB2in situ AMCs was observed. After performing FSP, the AMCs were characterized using Scanning Electron Microscope and the mechanical properties such as Ultimate Tensile Strength and microhardness on the processed zone of the AMCs were calculated. The effect of FSP on AA7075/ (3, 6 and 9) vol.% ZrB2in situ AMCs was investigated. The fracture morphologies on the processed surface of the AMCs were evaluated.