Investigation of Dry Sliding Wear Behaviour of B4C Particulate Reinforced Mg Matrix Composites (original) (raw)
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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.
Characterization of dry sliding wear mechanisms of AA5083/B 4 C metal matrix composite
https://link.springer.com/article/10.1007/s40430-019-1593-2, 2019
Aluminium alloy is known to be a soft material with inadequate hardness, poor wear resistance and good castability; in order to improve its wear resistance, numerous researches have been conducted. This paper deals with the wear mechanisms of aluminium alloy (AA5083) composites reinforced with boron carbide (B 4 C) particles having 300 mesh size. The fabrication of aluminium metal matrix composite specimen by varying boron carbide in 5%, 10%, 15% and 20% of the weight of aluminium alloy was produced (composite-A, composite-B, composite-C and composite-D, respectively) by the stir-casting technique. The wear mechanisms of the developed metal matrix composites were studied at various parameters such as sliding distance (1000 m, 2000 m and 3000 m), load (30 N, 40 N and 50 N) and sliding velocity (1 m/s, 2 m/s and 3 m/s). The wear mechanisms of the prepared specimen (composites-A, B, C and D) were compared with each other under the same experimental condition on the pin-on-disc wear machine. The major findings in this paper are: the better wear resistance property of the developed metal matrix composites than that of the alloy used as matrix, the wear of composite has been linear and effortless prediction of the wear characteristics by the researchers.
Evaluation of sliding wear behaviour of feldspar particle-reinforced magnesium alloy composites
Wear, 2000
The unlubricated sliding wear behavior of magnesium alloy AZ91 composites reinforced with feldspar particles of size 30-50 mm was evaluated. The content of feldspar in the alloy was varied from 1% to 5% in steps of 2-wt.%. Liquid metallurgy technique was used to fabricate the composites. A pin-on-disc wear-testing machine was used to evaluate the wear rate, in which an EN24 steel disc was used as the counterface. Results indicated that the wear rates of the composites were lower than that of the matrix alloy and further decreased with the increase in feldspar content. However, in both unreinforced alloy and reinforced composites, the wear rates increased with the increase in load and the sliding speed. Increase in the applied load increased the wear severity by changing the wear mechanism from abrasion to particle cracking induced delamination wear. It was found that with the increase in feldspar content, the wear resistance Ž. increased monotonically. The observations have been explained using scanning electron microscopy SEM analysis of the worn surfaces and the subsurface of the composites.
Wear Behaviour of Mg Alloy Reinforced with Aluminium Oxide and Silicon Carbide Particulates
Light weight metals like magnesium and its alloys are in more use these days in automotive & aerospace industries. Magnesium based hybrid structures which are combinations of magnesium and another material like Aluminium can offer optimal technical performance due to the favorable strength-weight ratio. Materials with improved tribological properties have become the pre-requisite of advanced engineering design. Metal matrix composites (MMCs) exhibit a unified combination of good tribological properties and high toughness of the interior bulk metal when compared with monolithic materials. Stir processing, a microstructure modification technique, has emerged as one of the processes used for fabrication of MMCs. Commercial cast or wrought type Mg-Al-Zn AZ-series alloys, such as AZ91 9 wt.% Al and 1 wt.% Zn, have been widely used in automobiles or electronic appliances. Tribological performance of the fabricated composite will be investigated using pin-on-disc wear & friction monitor. In this paper, a novel approach of making hybrid preforms with two types of reinforcements, i.e., lowcost and different sized particles, for magnesium-based composites is planned. This paper investigates the wear behavior of magnesium alloy (similar to commercially available AZ91) based metal-matrix composites (MMCs) reinforced with Silicon Carbide (SiC) & Aluminium oxide (Al2O3) particulates during dry/wet sliding.
Dry sliding wear behavior of SiCP/QE22 magnesium alloy matrix composites
Materials Science and Engineering: A, 2006
In present work, an attempt has been made to investigate the wear behavior of particle reinforced composites based on one of the proper magnesium alloys. The SiC P /QE22 composites and QE22 unreinforced specimens were produced via the powder metallurgy route. The volume fractions of SiC particles with three different shapes, i.e. sharp, blocky and round, were selected in the range of 10-25 vol.%. The dry sliding tests were conducted on unreinforced matrix and SiC P /QE22 composites using pin-on-disk apparatus, according to ASTM G99-95a standard. The applied loads were selected as 3, 5 and 20 N. The tests were carried out under sliding speeds of 0.5 and 1.2 m/s. In all tests, the sliding distances were chosen in the range of 750-3000 m. The worn pins surfaces and debries were examined using SEM. The EDX analysis was also performed on worn surfaces. According to results, the wear resistance of the matrix alloy could be increased by incorporation of SiC particles. However, in some cases, decrease of the wear resistance has been experienced. The wear resistance does not increase monotonically with increasing the particle content. The increase of sliding distance causes more weight loss at a constant rate. The application of higher loads induces more wear on specimens. The sliding velocity increment has same effect on wear behavior of specimens. The sharp shape reinforcing particles are more easily pull out and machined away from the composites with high particles content. According to observations, in various sliding test conditions, the abrasive, oxidation and delamination are mostly operated in combination.
Investigation on dry sliding wear behavior of Mg/BN nanocomposites
Journal of Magnesium and Alloys, 2018
The present research objective is to investigate the effect of boron nitride nanoparticles reinforcement on dry sliding wear behavior of pure Magnesium and magnesium nanocomposites. The fabricated nanocomposites contains varied percentages of boron nitride such as 0% (pure Mg), 0.5%, 1.5% and 2.5% were synthesized by using powder metallurgy technique and followed by a hot working process called hot extrusion. The pin on disk equipment was used for conducting the wear tests for traditional loads of 5 N, 7 N and 10 N at different sliding speeds of 0.6, 0.9 and 1.2 m/s against the steel disk at room temperature. For all traditional loads and sliding speeds, the changes in wear rate and friction coefficient (μ) with respect to sliding distances were observed and analyzed. The wear characteristics are observed with the help of scanning electron microscopy under given test conditions. To investigate dominant wear mechanisms for various test conditions, the morphologies of all worn composites surfaces were analyzed. Final results show that, for all nanocomposites the wear level raises with respect to the sliding speeds and loads. Magnesium reinforced with 0.5% boron nitride shows lower wear rates and low friction coefficient values compare with magnesium reinforced with 1.5% boron nitride and 2.5% boron nitride nanocomposites.
Journal of Scientific & Industrial Research
This paper has focused on abrasive wear and abrasion heating of Mg-and Al-based B 4 C and Cr reinforced composites. The B 4 C and Cr have been added in 5% in the Mg-and Al-matrices and their composites have been fabricated by a squeezed stir casting method. The matrices and composites are evaluated and characterized for microstructure, hardness and X-ray diffraction. The abrasive wear and temperature rise during abrasive wear tests are carried out using a tribo-tester machine. The microstructure of Mg-and Al-matrices and their composites mainly show a uniform distribution of the B 4 C and Cr reinforcements. The hardness of the composites enhanced upto 72% by including B 4 C and 30 to 37% in the case of Cr composites in comparison to Mg-and Al-matrices. Temperature rise during abrasive is found more in the case of B 4 C reinforced composites in comparison to Cr amalgam composites and the abrasive resistance of B 4 C composite is high in comparison to Cr amalgam composites. The wear rate of boron carbide composites is approximately 2-6 times lower than the Mg matrix under different conditions. SEM image analysis mainly shows the cutting and ploughing material removal mechanism in abrasive wear.
Reciprocal dry sliding wear behaviour of B4Cp reinforced aluminium alloy matrix composites
Wear, 2012
In the present work, AlSi9Cu3Mg alloy matrix composites reinforced with 15 and 19 vol% B 4 C p were produced by squeeze casting route at 850 1C under low vacuum. Titanium-containing flux (K 2 TiF 6 ) was used to promote the wetting between B 4 C and liquid aluminium metal. It was found, from the microstructural observations, that the wetting improved by the formation of a thin Ti-rich reaction layer. In order to investigate the wear properties, the samples were subjected to reciprocating wear tests against AISI 4140 pin under dry sliding conditions. The effect of B 4 C volume fraction, sliding velocity, applied load and sliding distance on reciprocal dry wear behaviour of composites was studied using general full factorial experimental design. The effects of factors and interactions on the coefficient of friction (COF) and the wear rate values of both composite specimens and counter materials were studied. Worn surfaces and wear debris were characterised using field emission gun scanning electron microscope (FEG-SEM), Energy Dispersive X-Ray Spectroscopy (EDS), optical microscope (OM) and X-Ray diffraction (XRD). From microstructural investigations, wear mechanism was suggested as a combination of adhesive, abrasive, and delamination wear.
Wear Behavior of Metal Matrix Composites in Comparison to Sintered Metal Carbides
Materials Today: Proceedings, 2016
Substantial progress in the development of aluminum and steel matrix composites achieved in the last years introduced these materials into the most important industrial applications. The possibility of combining various materials systems (metal-ceramic particles) gives opportunity for unlimited properties. The advantages of the composite materials are put in value when the costperformance relation is optimum. One way to produce these advanced materials as having low cost and optimal wear properties is powder metallurgy. The objective of this work is to characterize the wear properties of Functionally Graded Composite Materials (FGCMs) achieved in three layers in which one layer of the system is Metal Matrix Composites (MMCs), in comparison to Sintered Metal Carbides (SMCs) of types K 20 (85%WC + 15%Co) and M 20 (75%WC + 16%TiC + 9%Co).