Prediction of Coefficient Of Friction and Sliding Wear Rates of Cast Al6061-Si3N4 Composites using ANN Approach (original) (raw)
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Statistical Analysis on Tribological Behaviour of an Al Alloy 7075 – AL2O3 Composites
Acta Metallurgica Slovaca, 2016
Al alloy 7075 reinforced with Al2O3 particles of three different sizes (63,102, and 165 μm) were fabricated through the stir casting method. Dry sliding wear tests were conducted to evaluate the influence of load, sliding velocity and particle size on the wear loss and coefficient of friction of the composites using a pin-on-disc wear testing rig. Tests were conducted according to L9 Taguchi orthogonal array for three different loads (10, 30, and 50 N) at three different velocities (0.837, 1.674, and 2.512 m/s) for a constant time period of 30 minutes. The results showed that the wear increased with increasing load and sliding velocity whereas the coefficient of friction increased with increasing sliding velocity. On the contrary, the coefficient of friction decreased with increasing load. Composites reinforced with coarse Al2O3 particles exhibit superior wear resistance. It was found that the load was the most dominant factor influencing the wear loss and coefficient of friction followed by sliding velocity and particle size. A Scanning Electron Microscope (SEM) was used to study the morphology of the worn surfaces of the pins.
Acta Metallurgica Slovaca, 2021
The development of engineering materials is continuously attracting attention from scientists and engineers for numerous engineering applications. The physical properties and wear mechanism of aluminium (Al 6063) matrix reinforced with silicon carbide (SiC) and palm kernel shell ash (PKSA) particulates at different weight ratios ranging from 0 to 10 wt.% with 2 wt.% intervals were investigated. The liquid route of double stir casting was employed in synthesizing the composites. The wear experiment was conducted using the Taber-type wear abrasion machine. The worn surfaces were examined using scanning electron microscopy (SEM) with energy-dispersive x-ray spectroscopy (EDS), while the intermetallic phases were examined using the x-ray diffractometer (XRD). From the result, the increase in PKSA and SiC lowered and improved the density of the composites, respectively. The percentage porosity values (2 - 2.4%) obtained in this study were found to be within the acceptable limit of less t...
The present study deals with the investigation of wear behaviour of Al6061MMCs and its relation with Processing & microstructure. Al 6061 MMC composite containing different weight percentages of A l2O3 & keeping 2 weight % graphite constant have been fabricated using a Vortex method (stir casting method). A pin-on-disc wear testing tribometer was used to carry out the dry sliding wear tests on both Aluminum 6061 alloy composites and Aluminium 6061 monolithic alloy over a load range of 10-50N and sliding velocity of 1.88-5.65 m/s for various sliding distances of 1-3km. The SEM micrographs taken for the micro structure analysis of the reinforced composite specimens produced by casting show that the graphite and Al 2 O 3 particulates are uniformly distributed in the matrix. The SEM of wear surfaces showed that the large grooved regions and cavities with Al2O3 particles were found on the worn surface of the composite.
Friction and wear behaviour of cast Al 6063 based in situ metal matrix composites
Wear, 2011
Al 6063 based in situ composites were manufactured from Al-10%Ti and Al-3%B master alloys by liquid metallurgy route. The in situ TiB 2 reinforced Al 6063 composites were synthesized through the exothermic reaction between Al-10%Ti and Al-3%B master alloys, which were used in the ratio of 1:2 respectively in Al 6063 matrix alloy. Tribological properties of both Al 6063 matrix alloy and the developed in situ composites have been evaluated. Dry sliding friction and wear tests were carried out using a pin on disc type machine with steel counter disc hardened to HRC60. A load range of 10-50 N with the sliding velocity varying from 0.209 m/s to 1.256 m/s were adopted. Results have revealed that the developed in situ composites have lowered coefficient of friction and wear rates when compared with Al 6063 matrix alloy under all the test conditions studied. The excellent wear resistance of the in situ composites results from the formation of fine TiB 2 particles uniformly dispersed within the Al 6063 matrix alloy. The coefficient of friction of both matrix alloy and in situ composites decreased with increase in load, whereas it increased with increase in sliding velocity. However, wear rates of both matrix alloy and in situ composites increased with increase in both load and sliding velocity.
Identification and modelling of applicable wear conditions for stir cast Al-composite
Friction, 2019
A comprehensive study of the tribological performance of the Al-Zn-Mg-Cu/Al2O3 composite and its matrix alloy is presented in this paper, with a specific emphasis to identify and model the applicable wear conditions where the composite provides a minimum of 50% reduction in wear rate and 25% lowering of the friction coefficient. Two-body abrasion experiments following Taguchi L27 orthogonal design have been performed separately on alloy and composite materials, both prepared by the stir casting method. The influence of crucial control factors including silicon carbide (SiC) abrasive size, load, sliding distance, and velocity on the percentage variations of wear rates and friction coefficients between alloy and composite have been studied using the analysis of variance technique and full quadratic regression method. The dominant control factors are identified as abrasive size, load, and the interaction between abrasive size and load. This has been verified by establishing the influen...
Study on Dry Sliding Wear and Friction Behaviour of Al7068/Si3N4/BN Hybrid Composites
Materials
Hybrid aluminium metal matrix composites have the potential to replace single reinforced aluminium metal matrix composites due to improved properties. Moreover, tribological performance is critical for these composites, as they have extensive application areas, such as the automotive, aerospace, marine and defence industries. The present work aims to establish the tribological characteristics of Al7068/Si3N4/BN hybrid metal matrix composites prepared by stir casting route and studied using a pin-on-disc apparatus under dry sliding conditions. The hybrid composite samples were prepared at various weight percentages (0, 5, 10) of Si3N4 and BN particles. To investigate the tribological performance of the prepared composites, the wear experiments were conducted by varying the load (20, 40 and 60 N), sliding velocity (1.5, 2.5 and 3.5 m/s) and sliding distance (500, 1000 and 1500 m). Wear experimental runs were carried out based on the plan of experiments proposed by Taguchi. The minimum...
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2017
Tribological properties of silicon carbide-based aluminum metal matrix composite and aluminum matrix alloy have been studied for various sliding speeds of 3.14 and 3.77 m/s and load range from 10 to 30 N under dry, lubricated, and inert gas (argon) environment. Pin-on-disk tribometer were used for experiments. The composite was fabricated by stir casting route by using aluminum 7075 alloy as the matrix and 10% by weight silicon carbide as reinforced material. Results have revealed that the value of coefficient of friction is found to be maximum in case of inert condition in matrix alloy at sliding speed 3.77 m/s and minimum in case of lubricated condition in composite at sliding speed 3.14 m/s. The wear rate is least for both the alloy and the composite under lubricated condition compared with dry and inert condition. Wear rate increases with the normal load and sliding speed and it is maximum in inert condition of matrix alloy at 30 N. Uniform distribution of silicon carbide in alu...
Tribological Behavior of Al 7075/SiC Metal Matrix Nano-composite by Stir Casting Method
Journal of The Institution of Engineers (India): Series D, 2018
In the present research, aluminum 7075 alloy as base matrix metal and nano-silicon carbide (SiC) was selected as a reinforcement material. The Al 7075 MMCs was fabricated by varying weight percentage of reinforcement particles (1.0, 2.0, 3.0 and 4.0%) having particle dimension of 50 nm by using liquid metallurgy technique. Advanced computerized wear tester was used for wear evaluation with EN 32 steel disk and round pin as the nanocomposite sample. The rate of wear considering weight loss, friction coefficient, and specific wear rate was determined for the Al 7075 metal matrix and nano-composites. The results of nano-enhanced composite disclose better resistance to wear than tougher metal (Al 7075). The microstructural examination of the worn surface area of the composite sampling was analyzed using SEM. Weight loss of composite instances was identified, in addition to the distinction of wear loss with load which has been determined to be normal for both the metal matrix and the strengthened composites. It was, moreover, observed that the wear rate is reduced for nano-composites compared with the base metal. It was observed from the assessments that the wear rate reduces with enhancing weight percents of silicon carbide (SiC) and friction coefficient decreases with elevating sliding rate and also the weight percent of SiC. SEM examination revealed the existence of SiC and various other stages. The much more significant wear features (rate of wear, friction coefficient and weight loss) were increased with 4 wt% SiC composite as compared to Al 7075 matrix metal.
The Aluminium Al6061 alloys are mainly used in the application of automobile and aeronautical applications. An attempt has been made to increase the mechanical and tribological property of Al6061 alloy by adding SiC particulates as reinforcements. The particle size of SiC particles is 400μm. Hybrid metal matrix composite is prepared by Stir casting route and Friction and wear test is done by pin-on-disc method. Al6061T6 hybrid composites are used in automobile components for reliable, long life and high performance. Experiments were conducted based on the plan of experiments generated through Taguchi's technique. A L 9 Orthogonal array was selected for analysis of the data. Purpose of investigation is to find the influence of applied load, sliding speed and sliding distance on wear rate, as well as the coefficient of friction during wearing process was carried out using ANOVA and regression equation. Objective of the model was chosen as "smaller the better" characteristics to analyse the dry sliding wear resistance. Results show that sliding distance has the highest influence on wear rate followed by sliding speed and load. Sliding distance has the highest influence on wear rate followed by load and sliding speed.
Journal of Minerals and Materials Characterization and Engineering, 2014
In this investigation, optimization of tribological performance parameters of Al-6061T6 alloy reinforced with SiC (15% by weight) and Al 2 O 3 (15% by weight) particulates having particle size of 37 µm each has been presented. The wear and frictional properties of the hybrid metal matrix composites have been studied by performing dry sliding wear test using pin-on-disc wear tester. A L 27 orthogonal array is selected for the analysis of the data. From the test results it is observed that sliding distance has the significant contribution in controlling the friction and wear behaviour of hybrid composites. A confirmation test is also carried out to verify the accuracy of the results obtained through the optimization. In addition an optical micrograph test is also performed on the wear tracks to study the wear mechanism.