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Characterization of Microstructure, Mechanical Properties and Formability of Cryorolled AA5083 Alloy Sheets

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Abstract

In this work, microstructure, mechanical properties and formability of cryorolled and annealed AA5083 alloy sheets have been characterized and a comparison has been made with cold rolled and annealed sheets. Five-millimeter-thick sheets of this alloy were cryorolled in multiple passes to a final thickness of 1 mm (80% reduction with a true strain of 1.6). Effect of annealing time and temperature on hardness has been studied, and it has been found that a short annealing at 275 °C for 15 min after cryorolling would yield a good combination of strength and ductility. Microstructural investigations showed that the cryorolled and short annealed samples possess bimodal grain structure which is responsible for better mechanical properties than cold rolled sheets. From the experimentally determined forming limit diagrams, the limit strains of cryorolled sheets have been found to be almost equal to conventional cold rolled and annealed sheets in all modes of deformation. No major differences have been found in strain distribution also. This work clearly demonstrates that cryorolling of AA5083 alloy sheets followed by a short annealing with bimodal grain structure can be used for sheet metal forming applications with higher strength and toughness than conventional sheets without any reduction in formability.

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Acknowledgments

The authors acknowledge the help received from Prof. R. Jayaganthan, IIT Roorkee, Prof. I. Samjdar, IIT Bombay and Dr. S. Panigrahi, IIT Madras in characterization of the cold rolled and cryorolled samples.

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Authors and Affiliations

  1. Mechanical Engineering Department, Indian Institute of Technology Delhi, New Delhi, India

    Fitsum Feyissa & D. Ravi Kumar

  2. Mechanical Engineering Department, Marri Laxman Reddy Institute of Technology and Management, Hyderabad, India

    P. Nageswara Rao

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  1. Fitsum Feyissa
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Correspondence to Fitsum Feyissa.

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Feyissa, F., Ravi Kumar, D. & Rao, P.N. Characterization of Microstructure, Mechanical Properties and Formability of Cryorolled AA5083 Alloy Sheets. J. of Materi Eng and Perform 27, 1614–1627 (2018). https://doi.org/10.1007/s11665-018-3243-8

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