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Influence of Combined Severe Plastic Deformation and Sheet Extrusion Process on the Superplastic Formability of AA 5083 Aluminum Alloy Assessed by Free Bulge Test

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Abstract

A combination of two forming operations is considered for producing metal sheets with improved mechanical properties. As the first operation, a newly introduced severe plastic deformation method called dual equal channel lateral extrusion (DECLE) was performed at 300 °C for different passes on the AA 5083 aluminum blocks. Following the DECLE operation, sheet extrusion was conducted to convert the bulk samples, severely deformed through various passes, into 1.8-mm-thick sheets. Mechanical properties of the processed specimens, after each step of deformation, were examined using tensile and shear punch tests. It was found that the material after three passes of DECLE and also the corresponding forwardly extruded sheet presented the greatest strength. In order to evaluate the biaxial formability of the sheets, gas bulge forming tests were conducted using a PLC-controlled gas circuit. It was shown that the material processed via three passes of DECLE operation and extrusion demonstrated the maximum biaxial superplastic formability with an effective strain associated with 400% uniaxial elongation. This sheet specimen also required the minimum forming time, coinciding with a strain rate of 4 × 10−4 s−1, which is higher than strain rate for the sheet extruded from the annealed sample.

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Acknowledgments

The research work reported here was partially supported by the Iran National Science Foundation (INSF) under Grant No. 92014140. The authors appreciate the financial support from this organization. The EBSD images were prepared by contribution of Dr. Amir Momeni and Dr. S. Mandal. The authors also appreciate their cooperation.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, 65178, Iran

    F. Fereshteh-Saniee

  2. Department of Mechanical Engineering, Hamedan University of Technology, Hamedan, 65155-579, Iran

    N. Fakhar

  3. School of Metallurgical and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran

    R. Mahmudi

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  1. F. Fereshteh-Saniee
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Fereshteh-Saniee, F., Fakhar, N. & Mahmudi, R. Influence of Combined Severe Plastic Deformation and Sheet Extrusion Process on the Superplastic Formability of AA 5083 Aluminum Alloy Assessed by Free Bulge Test. J. of Materi Eng and Perform 28, 6682–6691 (2019). https://doi.org/10.1007/s11665-019-04384-6

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