Volume 5, Issue 1 ((Journal OF Welding Science and Technology 2019)
JWSTI 2019, 5(1): 31-44 |
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Abdollahzadeh A, Shokuhfar A. The effect of Zn element addition on dissimilar Al6061/AZ31 friction stir welded joints. JWSTI 2019; 5 (1) :31-44
URL: http://jwsti.iut.ac.ir/article-1-254-en.html
URL: http://jwsti.iut.ac.ir/article-1-254-en.html
1- Faculty of Materials Science and Engineering, K. N. Toosi University of Technology.
Abstract: (6502 Views)
In this study, friction stir butt welding of Mg and Al alloys with applying Zn interlayer was performed. To obtain optimum condition, a combination of two travel and three rotation speeds were selected. Mg-Zn and Mg-Al-Zn IMCs, Al solid solution and residual Zn, were the most common phases in the stirred zone, which eliminated the formation of Al-Mg intermetallics. The maximum mechanical properties were achieved for the joint fabricated at 35 mm/min and 600 rpm, caused to 24% improvement in tensile strength and around 3 times enhancement of elongation compared with Zn free sample FSWed at the same conditions. The fracture micrographs were consistent with corresponding ductility results. Fracture surfaces of Zn-added samples presented a fine texture with a mixture of brittle and ductile fracture feature, which was different from the coarse cleavage plane and fully brittle fracture of the joint without Zn interlayer.
Keywords: Friction stir welding, aluminum alloy, Magnesium alloy, Zn Interlayer, Microstructural characteristics, Mechanical properties.
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