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Microstructural Modification and Surface Hardness Improvement in Al-Mo Friction Stir Surface Composites

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Abstract

Molybdenum-reinforced aluminum matrix surface composites have been fabricated using friction stir processing. The Mo reinforcement results in an increase in the hardness and a decrease in the grain size. The Mo particle size and its dependence on the tool rotational speed are important for fabrication of high-performance composites. However, the effect of the tool rotational speed on microstructure, particle size and distribution, and hardness is not known. Here, we present microstructural and microhardness analysis of Al-Mo surface composites for varying tool rotational speeds. Increase in tool rotational speed results in reduced particle size, better particle distribution, and reduced grain size. The surface hardness also increases with an increase in the tool rotational speed.

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Acknowledgments

The authors acknowledge Indian Institute of Technology Gandhinagar for permission to use the Central Instrumentation Facility. The authors also thank Board of Research in Nuclear Sciences (BRNS) for the financial support provided through Grant No: 57/14/05/2019-BRNS/.

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  1. V. P. Mahesh and Ashutosh Kumar have contributed equally to this work.

Authors and Affiliations

  1. Advanced Materials Processing Research Group, Materials Science and Engineering, Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat, 382355, India

    V. P. Mahesh, Ashutosh Kumar & Amit Arora

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Correspondence to Amit Arora.

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Mahesh, V.P., Kumar, A. & Arora, A. Microstructural Modification and Surface Hardness Improvement in Al-Mo Friction Stir Surface Composites. J. of Materi Eng and Perform 29, 5147–5157 (2020). https://doi.org/10.1007/s11665-020-05018-y

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