Mathematical modeling and optimization of tribological behaviour of Al 7075 based hybrid nanocomposites
01 Aug 2021-Vol. 235, Iss: 8, pp 1561-1574
TL;DR: In this article, the authors proposed aluminium based nanocomposites for industrial applications that require lightweight materials that possess better tribological behaviour. But their tribological properties are not as good as those of aluminium-based nano-composites.
Abstract: Many industrial applications necessitate lightweight materials that possess better tribological behaviour. Whilst aluminium based nanocomposites are proposed owing to their lightness, their tribolo...
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TL;DR: In this paper , the optimal tribological parameters of Al 7075 composite reinforced with ZrB2 using Grey Relational Analysis (GRA) were investigated for measuring the wear and frictional properties on pin-on disc testing apparatus.
Abstract: In this work, the authors investigate the optimal tribological parameters of Al 7075 composite reinforced with ZrB2 using Grey Relational Analysis (GRA). Initially, the composite specimens were prepared by the variation of reinforcement 5%, 10% and 15% using stir casting routing method. Further, the developed metal matrix composites are used to measure the wear and frictional properties on pin-on – disc testing apparatus. The input parameters such as, wt% of reinforcement (5%, 10% and 15%), load (4.92N, 9.81N and 14.72N) and the time required for conducting the wear test is (15 min. 30 min and 45 min). A Taguchi L9 orthogonal array was designed for conducting the number of experiments. Based on the combination of number of experiments wear study has been conducted on the wear testing apparatus. Moreover, GRA was used for obtaining the best optimal input control parameters that gives minimum magnitude of wear and coeffi cient of friction (COF). Finally, the confi rmatory experiments are conducted and verifi ed with the Taguchi grey relational analysis. The results shows that the predicated optimal mean value is almost similar to the experimental value.
1 citations
11 Mar 2023
11 Jul 2022-Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
TL;DR: In this paper , the self-lubricative behavior of boron carbide (B4C) and carbon nanotube (CNT) reinforced 6061 aluminium alloy hybrid composites was investigated.
Abstract: This research investigates the self-lubricative behavior of boron carbide (B4C) and carbon nanotube (CNT) reinforced 6061 aluminium alloy hybrid composites. Hybrid composites were prepared by varying the volume percentages (5–15%) of B4C and CNT. Novel ultrasonic vibration (frequency of 20 kHz and power of 2.5 kW) assisted stir casting process was used for fabricating hybrid composites. A pin-on-disc type tribometer mounted with EN-8 as the counterface material was used to evaluate the friction and wear behavior of hybrid composites under dry sliding conditions. Normal loads ranging from 15–45 N and sliding speeds ranging from 1–2 m/s were applied during the experiments. The self-lubricative properties of different hybrid composites were assessed through the examination of the worn surface of pins using surface characterization techniques such as Scanning electron microscopy, Electron dispersive spectroscopy and Raman spectroscopy. The experimental results indicated that the addition of CNT particles increased the hardness of hybrid composites. The matrix strengthening efficiency of CNT was found to be greater at 10 vol.% of B4C, indicating a maximum hardness ranging from 102 to 109 VHN. In comparison, 10 vol.% of CNT hybrid composites showed superior tribological performance at all wear testing conditions. The mode of wear of hybrid composites suggested by the analysis on the worn pin surface was as follows: Scarce (5 vol.% CNT), Tribolayer (10 vol.% CNT) and Fracture (15 vol.% CNT).
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TL;DR: In this article, the authors present a set of conditions that will result in a product with a desirable combination of properties, which is a problem facing the product development community in general.
Abstract: A problem facing the product development community is the selection of a set of conditions which will result in a product with a desirable combination of properties. This essentially is a problem i...
4,109 citations
10 Mar 2014
TL;DR: In this paper, the most important manufacturing techniques used for the synthesis of bulk metal matrix nanocomposites are reviewed and the strengthening mechanisms responsible for the improvement of mechanical properties of nano-reinforced metal matrix composites have been reviewed.
Abstract: Metal matrix composites reinforced by nano-particles are very promising materials, suitable for a large number of applications. These composites consist of a metal matrix filled with nano-particles featuring physical and mechanical properties very different from those of the matrix. The nano-particles can improve the base material in terms of wear resistance, damping properties and mechanical strength. Different kinds of metals, predominantly Al, Mg and Cu, have been employed for the production of composites reinforced by nano-ceramic particles such as carbides, nitrides, oxides as well as carbon nanotubes. The main issue of concern for the synthesis of these materials consists in the low wettability of the reinforcement phase by the molten metal, which does not allow the synthesis by conventional casting methods. Several alternative routes have been presented in literature for the production of nano-composites. This work is aimed at reviewing the most important manufacturing techniques used for the synthesis of bulk metal matrix nanocomposites. Moreover, the strengthening mechanisms responsible for the improvement of mechanical properties of nano-reinforced metal matrix composites have been reviewed and the main potential applications of this new class of materials are envisaged.
740 citations
"Mathematical modeling and optimizat..." refers background in this paper
...Improved fracture toughness and ductility substantiate the selection of nanocomposites and nanoparticle inclusion improves the mechanical and wear-resistant characteristics of the matrix.(1) The industrial equipment that constitutes a pair of working surfaces requires improved mechanical and wear-resistant properties in addition to selflubrication....
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TL;DR: A review of different combinations of reinforcing materials used in the processing of hybrid aluminium matrix composites and how it affects the mechanical, corrosion and wear performance of the materials is presented in this paper.
Abstract: Aluminium hybrid composites are a new generation of metal matrix composites that have the potentials of satisfying the recent demands of advanced engineering applications. These demands are met due to improved mechanical properties, amenability to conventional processing technique and possibility of reducing production cost of aluminium hybrid composites. The performance of these materials is mostly dependent on selecting the right combination of reinforcing materials since some of the processing parameters are associated with the reinforcing particulates. A few combinations of reinforcing particulates have been conceptualized in the design of aluminium hybrid composites. This paper attempts to review the different combination of reinforcing materials used in the processing of hybrid aluminium matrix composites and how it affects the mechanical, corrosion and wear performance of the materials. The major techniques for fabricating these materials are briefly discussed and research areas for further improvement on aluminium hybrid composites are suggested.
558 citations
"Mathematical modeling and optimizat..." refers methods in this paper
...This could be achieved with the incorporation of two different types of nanoparticles into an aluminium matrix.(2) Among these nanoparticles, one must provide self-lubrication characteristics, while another is contributing to improved mechanical properties....
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TL;DR: In this article, the influence of graphite on the wear behavior of Al 7075/Al 2 O 3 /5.% graphite hybrid composite was investigated and the results revealed the effectiveness of incorporating graphite in the composite for gaining wear reduction.
Abstract: This work investigated the influence of graphite on the wear behavior of Al 7075/Al 2 O 3 /5 wt.% graphite hybrid composite. The investigation reveals the effectiveness of incorporation of graphite in the composite for gaining wear reduction. The Al 7075 (aluminium alloy 7075) reinforced with Al 2 O 3 –graphite were investigated. The composites were fabricated using liquid metallurgy route. Ceramic particles along with solid lubricating materials were incorporated into aluminium alloy matrix to accomplish reduction in both wear resistance and coefficient of friction. The Al 7075/Al 2 O 3 /graphite hybrid composite was prepared with 5 wt.% graphite particles addition and 2, 4, 6 and 8 wt.% of Al 2 O 3 . The hardness, tensile strength, flexural strength and compression strength of the Al 7075–Al 2 O 3 –graphite hybrid composites are found to be increased by increased weight percentage of ceramic phase. The wear properties of the hybrid composites containing graphite exhibited the superior wear-resistance properties.
468 citations
TL;DR: In this paper, a nano-Al2O3/2024 composites were prepared by solid-liquid mixed casting combined with ultrasonic treatment, and the obtained composite exhibited fine grain microstructure, reasonable Al 2O3 nanoparticles distribution in the matrix, and low porosity.
Abstract: Nano-sized ceramic particle reinforced aluminum matrix composites fabricated using conventional stir casting technique usually present poor distribution of nanoparticles within the matrix and high porosity. In this study, nano-Al2O3/2024 composites were prepared by solid–liquid mixed casting combined with ultrasonic treatment. The obtained composite exhibited fine grain microstructure, reasonable Al2O3 nanoparticles distribution in the matrix, and low porosity. Solid–liquid mixed casting technique was effective in inhibiting the agglomeration of nanoparticles in the matrix. The application of ultrasonic vibration on the composite melt during the solidification not only refined the grain microstructure of the matrix, but also improved the distribution of nano-sized reinforcement. Compared with the matrix, the ultimate tensile strength and yield strength of 1 wt.% nano-Al2O3/2024 composite were enhanced by 37% and 81%, respectively. The better tensile properties were attributed to the uniform distribution of reinforcement and grain refinement of aluminum matrix.
288 citations
"Mathematical modeling and optimizat..." refers methods in this paper
...Su et al.(6) produced AA2024/nano Al2O3 composites by semisolid casting with ultrasonic treatment....
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