Wear Behaviour of Mg Alloy Reinforced with Aluminium Oxide and Silicon Carbide Particulates (original) (raw)
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Wear Behavior of Magnesium Alloy AZ61 Reinforced with Sic and Al2O3 Particulates
This paper investigates the wear behavior of magnesium (Mg)-based metal–matrix composites (MMCs) reinforced with silicon carbide and aluminium oxide particulates (SiCp) during dry sliding. Experiments were conducted using a pin-on-disc configuration against a hardened tool-steel counter face under load of 3kg, and with disc rpm 500, wear track diameter 60mm, time 5min..Two samples were tested on pin on disc wear and friction monitor. The results showed that an alloy similar to the commercially available composition of AZ61 reinforced with 3% SiC&1% Al2O3 exhibit superior wear resistance as compared to magnesium alloy AZ61 reinforced with 1% SiC&3%Al2O3.Fabrication of metal matrix composites were done using stirr casting technique.
Materials Today: Proceedings, 2021
Global issues related to the scarcity of natural (or monolithic) materials need extensive research in the field of materials science. Aluminum (Al) and magnesium (Mg) based hybrid metal matrix composites (HMMCs) having properties like a light in weight, better stiffness, hardness, strength to weight ratio, and wear resistance are the best alternatives and has fulfilled the existing problems in all aspects of engineering and medical applications so far. 'Tribology' is an important mode which deals with the interlinked study of friction, wear and lubrication of interacting surfaces in relative motion to examine the tribological properties of fabricated composites. This article provides all the significant attributes of tribological behavior of HMMCs, based on the critical review of the existing literature, stir casting found to be the best fabrication technique, and pin on disc tribometer for the wear analysis is highly recommended for Al and Mg-based HMMCs.
2022
The wear behaviour of a stir cast hybrid magnesium matrix composite reinforced with nano zirconia (1 to 3 wt%) and 2 weight percent of nano boron carbide particles was examined using a pin-ondisk type tribometer at room temperature. Taguchi design based design of experiment was used to conduct the wear test. The variance analysis (ANOVA) was used to determine the impact of individual factor on composite wear performance. The wear characteristics were observed to be substantially influenced by the weight percent of reinforcements, load, and speed. The response surface methodology was used to create a mathematical model for wear and Coefficient of Friction, which were then validated by doing an experiment at the optimal level.
Wear study of Mg-SiCp reinforcement aluminium metal matrix composite
Journal of Mechanical Engineering and Sciences, 2016
Lightweight aluminium metal matrix composite materials hold potential requisite for modern tribological applications due to its inherent and better wear resistant properties over monolithic metallic materials. This study emphasised on the development of Al based metal matrix composite with SiCp as a reinforcement and magnesium (Mg) as a wetting agent using hybrid stir casting process. The study further analysed the effects of different size variations of silicon carbide particles such as the coarse particle size, fine particle size, intermediate particle size and mixed particle size in the fabrication of the composites on the hardness and wear properties. The pin-on-disc test was also done at room temperature in a dry sliding wear condition. It was observed that the mixed particle size SiCp in composite exhibited superior hardness with the value of 98.2 compared to other particle sizes of SiCp. This is due to the fact that mixed particle size supports a greater fraction of applied load while the fine and intermediate particle sizes sustain the hardening due to dislocation. The multiple particle size reinforced composite exhibits better performance than the single particle size in terms of wear resistance as the wear rate was the lowest with the value of 0.99 X 10-5. It can be concluded that the Mg addition in the composite showed better and tailored properties with a mixed particle size of SiCp of aluminium metal matrix composite.
Dry sliding wear behavior of globular AZ91 magnesium alloy and AZ91/SiCp composites
Wear, 2017
Dry sliding wear behavior of rheocast AZ91 magnesium alloy and AZ91/SiCp composites reinforced with 5 and 10 vol% SiC particles were investigated under normal loads of 10-250 N and sliding speeds of 0.1, 0.3, 0.5 and 1 m/s using pin-on-disc configuration against a 1045 steel disc counterbody. In this work, rheocast alloys and composites have been tested to determine the role played by the globular microstructure, and to evaluate if the increase observed in other mechanical properties is also translated to wear behavior. Wear rates and friction coefficients were registered during wear tests. Worn tracks and wear debris were studied by Scanning Electron Microscope (SEM) and Energy Dispersive X-Ray Spectrometry (EDS) in order to obtain the predominant wear mechanisms maps of the studied materials. The following wear mechanisms were found in the worn surface of the three materials: abrasion, oxidation delamination and melt wear. The composites with globular microstructure exhibit slightly superior wear resistance at low testing sliding speeds (0.1 and 0.3 m/s) and medium loads (40-80 N) than the AZ91 Mg alloy. But, for other conditions, the presence of SiC particles seems to be detrimental to the wear behavior of AZ91 magnesium alloy. A wear mechanisms map that allows identifying the main wear mechanisms for each wear condition and material composition has been developed. Rheocast microstructure improves the wear resistance of alloys in most conditions but the addition of SiCp reinforcement is only favorable in few of them.
This work deals with fabricating or producing magnesium based metal matrix composite and then studying its mechanical and tribological properties such as microstructure, tensile strength, impact strength and wear behavior of produced test specimen. In the present study a modest attempt has been made to develop magnesium based MMCs with reinforcing material, with an objective to develop a conventional low cast method of producing MMCs and to obtain homogeneous dispersion of reinforced material. To achieve this objective stir casting technique has been adopted. An Alloy similar to commercially available composition of AZ31 and SiC, Al2O3 has been chosen as matrix and reinforcing material respectively. Experiment has been conducted by varying weight fraction of 3% SiC and 1% Al2O3 & 1% SiC and 3% Al2O3 in matrix metal. The result shown that tensile strength, impact strength, wear resistance is good in matrix metal as compared to used weight compositions of SiC and Al2O3 in the composites.
Tribology International, 2020
In this study, magnesium matrix composites reinforced with 5 wt% WS2 and 15-20 wt% SiC particles were sintered via powder processing. The friction and wear behaviour were studied using a ball-on-disc tribometer against Al2O3 ball, subjected to normal loads of 1-4 N, room temperature and 110 °C, sliding speed of 22.5 mm/s, and lubricant of PAO base oil. The wear track and tribo-layer generated were investigated by optical profilometry and scanning electron microscopy. The average friction coefficient for Mg metal matrix composites (MMCs) was found to be 0.1-0.2 compared with 0.16-0.46 for pure Mg. Under all testing conditions, the Mg MMCs exhibited much lower friction coefficient and outstanding anti-wear property compared with unreinforced Mg and the Mg alloy AZ31.
Metallurgical and Materials Transactions A, 2016
In the present paper, the statistical investigation on wear behavior of magnesium alloy (AZ91) hybrid metal matrix composites using Taguchi technique has been reported. The composites were reinforced with SiC and graphite particles of average size 37 lm. The specimens were processed by stir casting route. Dry sliding wear of the hybrid composites were tested on a pin-on-disk tribometer under dry conditions at different normal loads (20, 40, and 60 N), sliding speeds (1.047, 1.57, and 2.09 m/s), and composition (1, 2, and 3 wt pct of each of SiC and graphite). The design of experiments approach using Taguchi technique was employed to statistically analyze the wear behavior of hybrid composites. Signal-to-noise ratio and analysis of variance were used to investigate the influence of the parameters on the wear rate.
Wear Behaviors Of B4C And Sic Particle Reinforced Az91 Magnesium Matrix Metal Composites
2016
In this study, the effects of B<sub>4</sub>C and SiC particle reinforcements on wear properties of magnesium matrix metal composites produced by pressure infiltration method were investigated. AZ91 (9%Al-1%Zn) magnesium alloy was used as a matrix. AZ91 magnesium alloy was melted under an argon atmosphere. The melt was infiltrated to the particles with an appropriate pressure. Wear tests, hardness tests were performed respectively. Microstructure characterizations were examined by light optical (LOM) and scanning electron microscope (SEM). The results showed that uniform particle distributions were achieved in both B<sub>4</sub>C and SiC reinforced composites. Wear behaviors of magnesium matrix metal composites changed as a function of type of particles. SiC reinforced composite has better wear performance and higher hardness than B<sub>4</sub>C reinforced composite.
The dry sliding wear behavior of Ti 2 AlC reinforced AZ91 magnesium composites was investigated at sliding velocity of 0.5 m/s under loads of 10, 20, 40 and 80 N using pin-on-disk configuration against a Cr15 steel disc. Wear rates and friction coefficients were registered during wear tests. Worn tracks and wear debris were examined by scanning electron microscopy, energy dispersive X-ray spectrometry and transmission electron microscopy in order to obtain the wear mechanisms of the studied materials. The main mechanisms were characterized as the magnesium matrix oxidation and self-lubrication of Ti 2 AlC MAX phase. In all conditions, the composites exhibit superior wear resistance and self-lubricated ability than the AZ91 Mg alloy. In addition, the anisotropic mechanisms in tribological properties of textured Ti 2 AlC-Mg composites were confirmed and discussed.