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Effects of Initial Temper Condition and Postweld Heat Treatment on the Properties of Dissimilar Friction-Stir-Welded Joints between AA7075 and AA6061 Aluminum Alloys

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Abstract

In this study, dissimilar AA7075-O/6061-O and AA7075-T6/6061-T6 butt joints were produced by friction stir welding (FSW), and postweld heat treatment (PWHT) was applied to the joints obtained. The effects of initial temper condition and PWHT on the microstructure and mechanical properties of the dissimilar joints were thus investigated. It was demonstrated that sound dissimilar joints can be produced for both temper conditions. A hardness increase in the joint area (i.e., strength overmatching) was obtained in the joints produced in the O-temper condition, whereas a hardness loss was observed in the joint area of the joints obtained in the T6 temper condition. It was also well demonstrated that PWHT could be used in order to improve the joint properties for both O and T6 joints provided that the joint is defect-free prior to subsequent heat treatment.

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Acknowledgments

The authors thank Associate Professor Dr. Binnur Gören Kıral, Dokuz Eylul University, for her help in providing the alloys used in this study. Thanks are also due to Associate Professors Dr. Ahmet Çakan and Dr. Murat Pakdil, Abant Izzet Baysal University, for their help with the SEM investigations.

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Authors and Affiliations

  1. Faculty of Engineering, Mustafa Kemal University, 31200, İskenderun/Hatay, Turkey

    Güven İpekoğlu (Research Assistant) & Gürel Çam (Professor)

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  1. Güven İpekoğlu
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  2. Gürel Çam
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Correspondence to Gürel Çam.

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Manuscript submitted December 23, 2013.

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İpekoğlu, G., Çam, G. Effects of Initial Temper Condition and Postweld Heat Treatment on the Properties of Dissimilar Friction-Stir-Welded Joints between AA7075 and AA6061 Aluminum Alloys. Metall Mater Trans A 45, 3074–3087 (2014). https://doi.org/10.1007/s11661-014-2248-7

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