Effect of Load on the Tribological Properties of Eutectic Al-Si Reinforced n-Al₂O₃ under Dry Sliding Conditions

Abstract

Advanced composites are the materials of the new generation. Hence, the focus of the study is to determine the tribological properties of the eutectic Al-Si alloy reinforced with (2, 4, 6, 8, and10 wt. %) of n-Al2O3 against chrome-plated steel ball under dry sliding conditions. The novelty of this work is the fabrication of the composite sample with this elemental composition, which is not done before. Spark plasma sintering (SPS) nonconventional fabrication method is used to fabricate advanced composite samples. Friction coefficient (COF) and wear rate of the composite samples were studied under high load, varying from 50 N to 300 N, using the ball-on-disc tribometer configuration, with other parameters such as stroke, frequency, sliding distance, and sliding velocity remaining constant at 2 mm, 30 Hz, 120 meter, and 0.120 m/s, respectively. Reduction in wear volume for the advanced composite was reported in the range 15.45–44.58% compared to the base alloy (eutectic Al-Si alloy). An increase in friction coefficient was reported in the range 28.80–35.65% compared to the base matrix alloy material. It was also reported that the wear rate increases and the friction coefficient of the composite sample decreases with an increase in load for the tribo-pair. It was observed that an increase in the wt. % of reinforcement influences the friction and wear behavior of the composite. Wear mechanism at high load was characterized by plastic deformation, adhesion, delamination, and abrasion wear. For pre- and postcharacterization of surface and worn tracks, scanning electron microscopy (SEM) electron dispersion spectroscopy (EDS), 3D surface profilometer, and optical microscopy were used. This work aimed to investigate the influence of load on the tribological properties of Al-Si eutectic reinforced n-Al2O3 under dry sliding conditions. Its main objective was to provide a new contribution to the tribological behavior of these composites fabricated using the nonconventional spark plasma sintering method.

Impact of surface texturing on the tribological behaviour of aluminium-silicon (Al-Si/Al2O3) advanced composite under dry and lubricating conditions

“…The calculated theoretical density of the fabricated composite sample is 2.737 g cm −3 , sintered density is 2.691 g cm −3 , porosity content (%) 1.680 and hardness is 115 HV 0.5 . The calculation and discussion related to the achievement of the above entities were reported in previous studies [35,39]. It was observed that the almost near theoretical densification was achieved using SPS fabrication route.…”

Friction and wear reduction by graphene nano platelets for hybrid nano Aluminium matrix composite under dry sliding conditions

“…It is attributed to 2D GNP lamellar structure multilayer sheets that provide easy as well as smooth shearing due to weak Van der Waals' forces and acts as an easy slider between the interfaces of the two bodies which result in reducing COF. This protective film has a low shear stress junction, which help in reducing COF and provides smooth sliding [36]. Various previous studies report the formation of the adsorbed graphene oxide layer at the interface, which ultimately reduces the COF and provide the self-lubrication effect.…”

“…The average surface roughness value for the composite sample is 0.008 µm, and for counter-body, Ra value is 0.04 µm. (6) load actuator (7) loading arm (8) sensor (piezoelectric) (9) supporting frame (10) x-y moving platform (11) emergency button (12) control panel [36].…”

Dry sliding wear characteristics of in-situ hybrid (Al3Ni + Al2O3)–Al composites

“…Increasing the wear resistance by incorporation of hard ceramic particles (TiB 2 , SiC, Al 2 O 3 , and TiC) into Al alloys is well known. [4][5][6][7] Srivyas and Charoo 4 reported that reduction in wear volume for 2 wt% to 10 wt% Al 2 O 3 /Al-Si composites was in the range of 15.45% to 44.58% compared to the base eutectic Al-Si alloy. Kubilay et al 5 indicated that the best wear resistance was achieved in the samples containing more Al 2 O 3 particles.…”