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Effect of Overlapping Friction Stir Processing on Microstructure, Mechanical Properties and Corrosion Behavior of AA6061 Alloy

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Abstract

The present work studies the influence of five-pass overlapping friction stir processing (FSP) on microstructure, mechanical properties and corrosion behavior of AA6061 alloy. The fine equiaxed grains were produced in large-area stir region of overlapping FSP and it was identified that the grain size of each overlapping pass is uniform in large area stir region (average grain size = 3.9 ± 3.5 µm). The five-pass overlapping FSP resulted in ductility enhancement while the strength remained inferior to that of parent metal due to thermal softening during FSP. On the other hand, corrosion resistance greatly improved after FSP due to the formation of a homogenous fine-grained structure and discontinuous precipitates.

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Acknowledgements

The authors gratefully thank the financial support provided by AR&DB (DRDO), New Delhi through the Grant CCMT/TM/ARDB/GIA/16-17/0332 dated 17/01/2017. The authors also thank Dr. Ch. Raja Mohan, Assistant Professor, Chemical Engineering Department for providing facilities for corrosion testing.

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  1. Department of Mechanical Engineering, NIT Warangal, Warangal, Telangana, 506004, India

    Marukurti V. N. V. Satyanarayana, Kumar Adepu & Karan Chauhan

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  1. Marukurti V. N. V. Satyanarayana
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  2. Kumar Adepu
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Correspondence to Marukurti V. N. V. Satyanarayana.

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Satyanarayana, M.V.N.V., Adepu, K. & Chauhan, K. Effect of Overlapping Friction Stir Processing on Microstructure, Mechanical Properties and Corrosion Behavior of AA6061 Alloy. Met. Mater. Int. 27, 3563–3573 (2021). https://doi.org/10.1007/s12540-020-00757-y

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  • DOI: https://doi.org/10.1007/s12540-020-00757-y

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