Author
Ajay Singh Verma
Other affiliations: Sharda University
Bio: Ajay Singh Verma is an academic researcher from PEC University of Technology. The author has contributed to research in topics: Metal matrix composite & Corrosion. The author has an hindex of 5, co-authored 7 publications receiving 139 citations. Previous affiliations of Ajay Singh Verma include Sharda University.
Papers
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TL;DR: A summary of work reported on Aluminium metal matrix composites with particulate reinforcement is presented in this article, which reveals that decrease in particle size and increase in percentage addition of reinforcement increase hardness and tensile strength of the composite.
95 citations
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TL;DR: In this article, the pitting initiation on the interface of the PMMC has been observed in the case of aluminum-based PMMCs and the corrosion tendency is more in case of SiC, Al 2 O 3, B 4 C, Fly ash as compared to base alloy.
40 citations
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TL;DR: The mineralogical characteristics of bauxite residue are summarised and current progresses on utilisation of buxite residue in different fields of science and engineering are presented in detail.
35 citations
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TL;DR: In this paper, a bottom pouring mechanism is introduced in stir casting process to fabricate a low-cost particulate metal matrix composite (PMMC) using Al-Mg-Si alloy with BR as reinforcement.
Abstract: Bauxite residue (BR) is the waste generated from alumina processing industries, which is considered as an environmental problem throughout world. Hence, utilization of BR is the need of the hour. In the present investigation, vacuum type bottom pouring mechanism is introduced in stir casting process to fabricate a low-cost particulate metal matrix composite (PMMC) using Al–Mg–Si alloy with BR as reinforcement. Controlled process parameters in terms of stirring speed and particle percentage were chosen in development of Al–Mg–Si/BR PMMC. The result of the microstructural study reveals uniform distribution of particles with 350 and 450 rpm of stirring speed. In this study, it was observed that increased BR weight fraction resulted in increased porosity content of the developed PMMC. Porosity content was found to have major impact on the microhardness of developed Al–Mg–Si/BR PMMC. The microhardness behavior of the developed PMMC was also predicted at different indentation loads. Microstructure was examined at both stirring speeds at different cross sections of the cylindrical samples. The reinforcement content was varied in a percentage range of 2–8% by weight. Beyond the limit of 8-wt% reinforcement concentration, defects like voids, local clustering, and agglomeration of particles were seen in the developed Al–Mg–Si/BR PMMC.
16 citations
01 Jan 2012
TL;DR: In this paper, the effect of varying temperature, composition of fly ash and stirring speed on these properties is studied using Taguchi method (L9 array) in the first phase number of experiments were reduced to be 9 using L9 Orthogonal Array.
Abstract: Metal matrix composite (MMC) is a material composed of two or more distinct phases (matrix phase and reinforcing phase) and having bulk properties significantly different from those of any of the constituents. In the present work MMC of aluminium 6063 reinforced with fly ash particles is fabricated by using stir casting process. Fatigue strength and Vickers hardness of fabricated samples is observed by Vickers hardness tester and fatigue testing machine. Effect of varying temperature, composition of fly ash and stirring speed on these properties is studied using Taguchi method (L9 array). In the first phase number of experiments were reduced to be 9 using L9 Orthogonal Array. Present study includes maximization of hardness as objective function and fatigue strength as a constraint for fly ash based composites. The value of hardness found to be maximum for the 9% fly ash composition at 720oC at 400 rpm. It is to be mentioned that even though hardness value found to be maximum for 9% but due to substantial reduction in fatigue strength fly ash composition of near about 9% at 720oC with 400rpm stirring speed is not recommended for fabrication.
9 citations
Cited by
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31 Oct 2001
TL;DR: The American Society for Testing and Materials (ASTM) as mentioned in this paper is an independent organization devoted to the development of standards for testing and materials, and is a member of IEEE 802.11.
Abstract: The American Society for Testing and Materials (ASTM) is an independent organization devoted to the development of standards.
3,792 citations
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TL;DR: In this article, a bottom tapping stir casting furnace with electromagnetic and ultrasonic stirrer along with squeeze attachment is recommended for the production of metal matrix composites, based on the critical assessment of the literature, especially the mechanical properties of the produced MMCs.
332 citations
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TL;DR: In this article, a review of the state of the art with regards to commercially important zeolite LTA technology, and also identified strategies to further promote uptake of this material in industry.
136 citations
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TL;DR: In this article, the impact of post-multi-pass friction stir processing (FSP) on the microstructure, mechanical, wear and fracture behaviors of the fabricated 10 cycle-accumulative roll bonded Al-2%B4C composites was analyzed.
Abstract: This paper aims to understand the impact of post-multi-pass friction stir processing (FSP) on the microstructure, mechanical, wear and fracture behaviors of the fabricated 10 cycle-accumulative roll bonded Al-2%B4C composites. The increase in the number of tool-passes directly improved homogeneity and fragmentation of B4C particles, microhardness, tensile strength (86.84–173.92 MPa) and fracture resilience of the Al-2%B4C composite. The tribological properties of the composite are improved with a rise in the number of tool passes. Wear rate, upper boundaries and mid-fluctuation lines of the friction coefficient decreased from 6.198 × 10−5 to 1.095 × 10−5 mm3/Nm, 0.56 to 0.19, and 0.31 to 0.11 respectively as the number of tool passes was varied between 1 and 8 passes. An increase in the sliding distance caused an overshoot of the complete waveform of friction coefficient to be above the mid-line of fluctuation due to the induced frictional/thermal input emanating from the prolonged surface-surface contact. Homogenous particle dispersion imposes abrasion wear mechanism on the composite. Ductile fracture is the predominant failure mode of the composites. Post-multi-pass friction stir processing of the accumulative roll bonded Al-2%B4C composite is an effective approach of achieving high performance in Al-B4C composite.
100 citations
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TL;DR: In this article, the impact of graphene/CNTs reinforcement in the Al matrix based on key parameters, e.g., yield strength, microhardness, ductility and tensile strength, was evaluated.
86 citations