Mechanical and tribological properties of Al7475-SiCp composites by stir casting method and wear rate modeling using RSM

Abstract

The microstructure, mechanical and wear properties of the Al 7475-SiC p composites and to investigate the effects of SiC micro-particles reinforcement with alloy have been studied. Al 7475-SiC p composites have been developed by a stir casting method. The SiC p size in the range of 15-40 lm with weight.% of 0, 5, 10 and 15 were injected in molten Aluminum 7475 alloy in argon gas environment and stirrer using a mechanical method at 450 rpm to ensure uniform distribution of SiC particles. The mechanical properties such as hardness and compressive strength of the composites were found to be gradually improved with the addition of 5-15% SiC p reinforcement. The ultimate tensile and impact strength increased with 10% of SiC p reinforcement. For modeling the wear rate, the experiments were conducted in Pin-on Disc tribometer at room condition. A three-level central composite design with response surface methodology was used to reduce the experimental conditions and to predict the abrasive response of wear rate through the development of mathematical models. The model developed is efficiently predicted the rate of wear at 95% confidence level and the entire model validate with analysis of variance.

Investigations on tensile fractography and wear characteristics of Al7075-Al2O3-SiC Hybrid Metal Matrix Composites routed through liquid metallurgical techniques

“…steel disc into the MMCs and enhance the wear resistance. The Al 2 O 3 -SiC particulates may get crushed to powder form to maintain the wear resistance as detected in the results of wear rate [32,33]. Similar results have been noticed [5] and it is concluded that, from the analysis it is seen that, the SEM analysis of worn-out surfaces of the MMCs (Al7075 + 2%Al 2 O 3 + 3%SiC) is different from that of Al7075 + 5%Al 2 O 3 + 7%SiC composite.…”

Process Parameter Optimization of Aerospace-Grade Dissimilar Aluminium Alloy 7075 and 2014 by Friction Stir Welding

“…B. Rajeswari et al [12] also optimized the four process parameter with respect to the three output variables and verified experimentally that by using the optimized process parameter the predicted experimental results were obtained. Sekar et al [13][14] carried out the study of specific wear rate with respect to the variation of Load, Sliding Distance and wt.% of SiC with central composite design. Also, optimized the variation of input factor with the output response to predict the abrasive response of the wear.…”

Fabrication of AA7050 Hybrid Composite Reinforced with Nano Al₂O₃/ Micro ZrO₂ Particles by Stir Casting Method and Study of Mechanical and Tribological Properties

“…Stir casting is most widely used liquid state method for fabrication of aluminium composite [10][11][12][13] in which ceramic particles Al2O3/ZrO2 (dispersed constituent) called reinforcements mixed with AA7050 matrix using mechanical stirrer [1,2]. Stir casting technique is also known as vortex technique [14][15][16][17]. It is a simple, economical and most widely used technique to make metal matrix composite.…”