Effect of Quenching Media and Ageing Time on Al6061-Beryl Composites

Abstract

— Aluminum alloy based metal matrix composites are becoming very popular because of their outstanding properties such as high strength to weight ratio, excellent mechanical properties and improved wear properties. From literature survey it was observed that very limited report available on Aluminum alloy-beryl composites, particularly on the effect of beryl content, quenching media and heat treatment on the mechanical and wear properties of Aluminum-beryl composites. Accordingly, the aims of the present study are (i) preparation of Al6061-beryl particles by liquid metallurgy method (stir cast) with possible standardization of the beryl addition to liquid Aluminum alloy, (ii) Study the effect of different quenching media and the beryl content (2-12 wt. %) on the mechanical and wear properties of these composites in both as cast and heat treated conditions. Heat treatment procedure of solutionising at temperature of 5300C for 1hour and quenching in different media (air, water and ice) followed by natural and artificial ageing for different times was adopted. It was observed that the addition of beryl particles to Al6061 alloy improves its hardness, tensile strength and wear resistance with increasing beryl content while the heat treatment had significantly improved these properties compared to that of base alloy and as cast composites.

Effect of Solutionizing on Dry Sliding Wear of Al2024-Beryl Metal Matrix Composite

“…The wear resistance decreases as the sliding distance increases for the ascast and solutionized alloy and its composites. A similar trend was also observed independently for different sliding distances, applied loads and sliding velocities (Howell & Ball, 1995;Reddappa et al, 2011;Skolianos & Kattamis, 1993;Suresh et al, 2002;Venkataraman & Sundararajan, 1996;Wu & Li, 2000). Figure 6.…”

“…Al2024-Beryl composites were developed by adding a proportionate weight percentage of reinforcement from 0 wt.% to 10 wt.% in steps of 2 wt.%. This liquid metallurgy route has been used for developing MMCs by many researchers (Basavarajappa & Chandramohan, 2005;Krishnan, 1980;Ramesh, Swamy, & Chandrashekar, 2011;Ramesh, Bharathesh, Verma, & Keshavamurthy, 2012;Reddappa, Suresh, Niranjan, & Satyanarayana, 2011;Skolianos & Kattamis, 1993;Suresh et al, 2003;Xu & Chung, 1988) because this method is the most economic for the fabrication of MMCs. The castings were tested to determine common casting defects using an ultrasonic flaw detector.…”

Study on Micro - Nano Sized Al2O3 Particles on Mechanical, Wear and Fracture Behavior of Al7075 Metal Matrix Composites

“…The chance of debonding of nano particles due to the incessant sliding causes the particles to get slackened from the matrix material and get stuck among the sliding surfaces, whereas it might act like an abrader leading to a short period of wear. Generally, this is the cause for enhanced wear rate [37,38]. The Energy Dispersive Spectroscopy study of nano particles reinforced composite is shown in Fig.…”

Mechanical and tribological behavior of Al composites containing varying beryllium aluminum silicate and constant CeO2

“…Strengthening of Al composite with strong discontinuous SiC fibers is confirmed by Arsenault and Fischer [35], Arsenault [36] and Taya et al [37]. Reddappa et al [38] studied the effect of quenching on Al6061 composite with increasing beryl addition (2-12 wt.%) and found improved hardness and strength in heat treated and aged samples. Beryl particle additions have given rise to large residual compressive stress developed during solidification due to difference in coefficient of expansion between ductile matrix and brittle ceramic particles.…”