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Superplastic Forming of Multipass Friction Stir Processed Aluminum-Magnesium Alloy

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Abstract

Multipass friction stir processing (FSP) of AA5086 Al-Mg alloy was carried out to obtain bulk fine grain material for superplastic forming. FSP produced inhomogeneous microstructure in the thickness direction. The aim of the present work was to understand superplastic forming behavior of distinct microstructural layers, i.e., nugget layer (NL) containing microstructure from nugget zone, thermo-mechanically affected/heat-affected layer (TL) containing microstructure from thermo-mechanically affected/heat-affected (TMAZ/HAZ) zone, and composite layer (CL) containing microstructure from both the above zones (nugget and TMAZ/HAZ). Superplastic forming of NL, TL, and CL blanks was carried out at constant gas pressure. Three different forming gas pressures of 0.75, 1.15, and 1.5 MPa corresponding to strain rates of 5 × 10−4 s−1, 1 × 10−3 s−1 , and 5 × 10−3 s−1, respectively, were used. Forming characteristics of CL were found to be comparable to that of NL and even better at higher forming pressures. Concomitant microstructural evolution during bulging of CL and NL plays an important role here.

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Acknowledgement

The authors gratefully acknowledge support from Department of Science and Technology, India under fast track scheme for young scientist, Grant No. SR/FTP/ETA-44/2007 toward carrying out this research.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, Uttarakhand, India

    S. Pradeep (Ph.D Student) & Vivek Pancholi (Associate Professor)

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  1. S. Pradeep
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  2. Vivek Pancholi
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Correspondence to Vivek Pancholi.

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Manuscript submitted September 18, 2013.

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Pradeep, S., Pancholi, V. Superplastic Forming of Multipass Friction Stir Processed Aluminum-Magnesium Alloy. Metall Mater Trans A 45, 6207–6216 (2014). https://doi.org/10.1007/s11661-014-2573-x

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  • DOI: https://doi.org/10.1007/s11661-014-2573-x

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