The University of Osaka · Engineering
Professor Abhishek Sharma's research lab specializes in advanced materials processing, with a primary focus on friction stir-based techniques for developing high-performance aluminum matrix composites. The lab explores innovative methods such as friction stir processing (FSP), friction stir alloying, and solid-state friction surfacing to enhance mechanical, wear, and corrosion properties of lightweight alloys by incorporating reinforcements like SiC, graphite, and graphene nanoplatelets. A key emphasis is placed on microstructure-property correlations, defect suppression, and the in-situ generation of few-layer graphene during processing. The lab also investigates functional nanocomposites, including polymer-clay systems for ion-conducting applications, demonstrating a broad yet focused approach in materials synthesis and characterization.
Figures are computed from collected data and may differ slightly.
Friction stir processing (FSP) of Al6061-SiC-Graphite hybrid composites is studied in detail via force analysis, spectroscopic, microstructural and indentation studies. Effect of various tool rotational speeds was assessed, and the axial force variation was monitored. The presence of graphite as a reinforcement influences the axial force fluctuations due to its flaky nature and high thermal conductivity. Variation in microstructure at different tool rotational speed is studied using scanning ele
The present study aims to enhance the strength of friction stir lap welded aluminum alloys by using an interlayer of graphene nanoplatelets (GNPs) at the weld interface. With GNP interlayer, the weld strength and percentage elongation increased by 121 and 53%, respectively, as compared to the weld without GNP interlayer. The interlayer also changes the mode of fracture from brittle in the weld without GNP to ductile mode. Grain size in the weld with interlayer decreased by ~38% as equated to the
Friction stir alloying is primarily employed for the fabrication of surface composite to improve surface properties like hardness, wear resistance, and corrosion resistance without significantly affecting the bulk properties of the alloy. The present study demonstrates the novel method for the fabrication of bulk aluminum-graphene nanoplatelets composite by using friction stir alloying. Here, the novelty is shown through the method of graphene nanoplatelets incorporation in the stir zone. For th
Aluminium-based hybrid metal grid composites (MMC) are extensively utilized in automobile applications (engine cylinders, pistons, etc.) as they exhibit a fantastic blend of properties. Here, a detailed study of nano-mechanical, electrochemical and Raman spectroscopic behavior of friction stir processed Al6061-SiC-graphite hybrid surface composite is presented. The effect of various tool rotational speeds was evaluated along with the monitoring of variation in axial force. Microstructural change
Abstract A new combination of ionically conducting polymer–clay nanocomposites based on (PAN) 8 LiClO 4 + x wt % montmorillonite (unmodified) clay has been prepared using the standard solution cast process. X‐Ray diffraction (XRD) analysis reveals strong interaction of polymer salt complex (PS) with the montmorillonite matrix evidenced by changes in d 001 spacing of the clay and enhancement in the clay gallery width on composite formation possibly due to intercalation of polymer–salt complex int
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