TY - JOUR T1 - The effect of Zn element addition on dissimilar Al6061/AZ31 friction stir welded joints TT - اثر افزودن عنصر آلیاژی روی بر اتصال نامشابه Al6061/AZ31 ایجاد شده به روش جوشکاری اصطکاکی JF - JWSTI JO - JWSTI VL - 5 IS - 1 UR - http://jwsti.iut.ac.ir/article-1-254-en.html Y1 - 2019 SP - 31 EP - 44 KW - Friction stir welding KW - aluminum alloy KW - Magnesium alloy KW - Zn Interlayer KW - Microstructural characteristics KW - Mechanical properties. N2 - 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. M3 ER -