Evaluation of sliding wear behaviour of feldspar particle-reinforced magnesium alloy composites (original) (raw)
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Sliding wear behaviour of AZ31B magnesium alloy and nano-composite
Transactions of Nonferrous Metals Society of China, 2012
AZ31B magnesium alloy and nano-composite were manufactured by hybrid casting process and hot extruded at 350 C. The sliding wear behaviour of alloy and nano-composite was estimated at room temperature using the standard pin-on-disc wear test equipment. The tests were conducted under a normal load of 10 N at different sliding speeds ranging from 0.60 to 1.2 m/s for distance up to 2000 m. The wear mechanisms of the worn out surface were studied using SEM analysis. The influence of test parameters on wear rate of the pins was established using a linear regression model statistically. Compared with the AZ31B magnesium alloy, the nano-composite shows lower wear rates due to higher hardness improvement caused by the reinforcement. The wear mechanism appears to be a mix-up of ploughing, rows of furrows, delamination and oxidation.
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.
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.
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.
Wear, 2011
The effect of the microstructure on the dry sliding wear of six aluminium alloy 6061 matrix composites reinforced with 15 vol.% of MoSi 2 particles and two monolithic 6061 alloys processed by powder metallurgy with and without ball milling has been studied. Wear testing was undertaken using pin-onring configuration against an M2 steel counterface at 0.94 m/s and normal load of 42, 91 and 140 N. The wear resistance of the aluminium alloys was significantly improved by ball milling and the addition of reinforcing MoSi 2 particles due to a more stable and more homogeneous microstructure, which avoids the detachment of the mechanically mixed layer. Wear rate of materials in T6 decreases as solutionized hardness of the materials increases. This behaviour is rationalized by taking into account the precipitation state of the matrix. In addition, wear rate follows a Hall-Petch type relationship, showing that the reduction of matrix grain size plays an important role in the increase in the wear resistance of the composites. The results indicate that the present intermetallic reinforced composites can be considered potential substitutes for ceramic reinforced aluminium alloys in tribological applications.
Dry sliding wear behaviour of ZE41A magnesium alloy
Wear, 2011
Wear resistance of the ZE41A magnesium alloy was tested using pin-on-disc technique and steel as counterbody on dry sliding conditions. Wear rates and friction coefficients were measured in a sliding velocity range of 0.1-1 m s −1 and in a normal forces range of 5-40 N. Worn tracks and wear debris were studied by scanning electron microscope (SEM) and energy dispersive X-Ray spectrometer (EDX) to define the main wear mechanism for each testing condition. Wear mechanism map of the studied alloy was proposed. Low sliding velocities led to oxidative wear mechanism regardless of the load used, with a small participation of abrasion and delamination mechanisms. Intermediate speeds led to a predominant abrasion mechanism with participation of oxidation. At high speeds the main mechanism changed from abrasion at low loads to delamination at intermediate loads and to plastic deformation at high loads.
Analyzing the mechanical and wear behavior of age hardening processed AZ31 magnesium composites
The usage of AZ31 magnesium alloy has been limited in tribology applications, due to low hardness and poor wear resistance. In this connection, the age-hardening process is a promising heat treatment process for enhancing mechanical strength and wear resistance. Hence, the present work aims to analyze the effect of the age-hardening process on the microstructure, mechanical and wear behavior of AZ31 Magnesium-Calcium hexaboride composites (Mg composite). Here, dry sliding wear behavior was analyzed with different loads (10, 20, and 30 N) and sliding velocity (0.4, 0.6, and 0.8 m. s −1) for a constant sliding distance of 2000m. Age hardened composites exhibited a higher hardness and compressive strength which was due to the increased volume of the secondary precipitates (Mg 17 Al 12 and Al 8 Mn 5). The morphology study revealed that there is an exhibition of shear bands and brittle fracture for Age hardened composites. The remarkable wear rate reduction was achieved for age hardening processed composites due to the increased load-bearing capacity induced by the presence of a high volume of secondary precipitates. Delamination wear is the dominant wear mechanism for the composites and the delaminated craters increases with increasing the load condition. Further, the elemental mapping on the collected wear debris was also used to confirm the wear mechanism.
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.
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, 2007
The objective of the present investigation was to assess the influence of SiC particle dispersion in the alloy matrix, applied load, and the presence of oil and oil plus graphite lubricants on the wear behaviour of a zinc-based alloy. Sliding wear performance of the zinc-based alloy and its composite containing SiC particles has been investigated in dry and lubricated conditions. Base oil or mixtures of the base oil with different percentages of graphite were used for creating the lubricated conditions. Results show a large improvement in wear resistance of the zinc-based alloy after reinforcement with SiC particles. The lubrication improved the wear resistance and friction behaviour of both the reinforced and base alloys. It was also observed that there exists an optimum concentration of graphite particles in the lubricant mixture that leads to the best wear performance. The composite experienced higher frictional heating and friction coefficient than the matrix alloy in all the cases except oil lubricated conditions; a mixed trend was noticed in the latter case. The wear rate and frictional heating increased with load while friction coefficient was affected in an opposite manner. Test duration influenced the frictional heating and friction coefficient of the samples in a mixed manner. Examination of worn surfaces revealed a change of predominating wear mechanisms from severe ploughing and/or abrasive wear for base alloy to delamination wear for the reinforced material under dry sliding conditions. The presence of the lubricant increased the contribution of adhesive wear component while reducing the severity of abrasion. This was attributed to the generation of more stable lubricant films on the contacting surfaces. Cross-sections of worn surfaces indicated substantial wear-induced plastic deformation, thereby suggesting adhesive wear to be a predominant wear mechanism in this study. The debris particles revealed deformed flakes and machining chips signifying the involvement of adhesion and abrasion modes of wear respectively.