Effect of weld parameters on the microstructure and mechanical properties of dissimilar friction stir joints between pure copper and the aluminum alloy AA7075-T6

Ahmet Cakan; Mustafa Ugurlu; Emre Kaygusuz

doi:10.3139/120.111297

Article

Effect of weld parameters on the microstructure and mechanical properties of dissimilar friction stir joints between pure copper and the aluminum alloy AA7075-T6

Ahmet Cakan , Mustafa Ugurlu and Emre Kaygusuz

Published/Copyright: April 24, 2019

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From the journal Materials Testing Volume 61 Issue 2

Abstract

Friction stir welding frequently produces a superior microstructure and mechanical properties than conventional methods for welding nonferrous materials and alloys. In this study, friction stir welding was used to join sheets of the aluminum alloy AA7075 with commercially pure copper cpCu. Two rotational speeds, 660 and 920 rpm, and three welding speeds, 18, 32 and 54 mm × min⁻¹, were studied to determine the effects of these parameters on the structure and mechanical properties of friction stir welded AA7075-cpCu. The joint performance was investigated by conducting optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), by microhardness measurements and mechanical testing (e. g. tensile tests). A maximum tensile strength of 224 MPa and percentage elongation of 2.49 were obtained when friction stir welding process parameters, namely rotational speed and welding speed, were kept at 660 rpm and 32 mm × min⁻¹, respectively.

*Correspondence Address, Assoc. Prof. Dr. Ahmet Cakan, Department of Mechanical Engineering, Faculty of Engineering, Ciftlikkoy Campus, Mersin University, 33343, Mersin, Turkey, E-mail: ahcakan@mersin.edu.tr

Assoc. Prof. Ahmet Cakan, born in 1964, graduated from the Mechanical Education Department in Marmara University, Istanbul, Turkey in 1987. He received his MSc at Mustafa Kemal University, Hatay in 2001 and his PhD at Firat University, Elazig in 2006. He currently works as Associate Professor at the Department of Mechanical Engineering of Faculty of Engineering, Mersin University, Mersin, Turkey. His main research interests include material science, friction stir welding, cutting tool wear and physical and chemical vapor deposition.

Mustafa Ugurlu, born in 1991, graduated from the Mechanical Engineering Department in Mersin University in 2012. He received his MSc also at Mersin University in 2015. He is currently working as a research assistant at the Department of Mechanical Engineering of Faculty of Engineering, Mersin University, Mersin, Turkey. His main scientific interests include material science and welding technology.

Emre Kaygusuz, born in 1990, graduated from the Mechanical Engineering Department at Sakarya University, Sakarya, Turkey in 2014. He received his MSc at Mersin University in 2017. He is currently a PhD student at Mersin University, Mersin, Turkey. His main research interests include material science and welding technology.

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Published Online: 2019-04-24

Published in Print: 2019-02-04

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https://doi.org/10.3139/120.111297