%0 journal article
%@ 1362-1718
%A Suhuddin, U.F.H., Fischer, V., Kostka, A., dos Santos, J.F.

%D 2017
%J Science and Technology of Welding and Joining
%N 8
%P 658-665 
%R doi:10.1080/13621718.2017.1300744
%T Microstructure evolution in refill friction stir spot weld of a dissimilar Al–Mg alloy to Zn-coated steel
%U https://doi.org/10.1080/13621718.2017.1300744
8 
%X In the present study, dissimilar welds of an Al–Mg–Mn alloy and a Zn-coated high-strength low-alloy steel were welded by refill friction stir spot welding. The maximum shear load recorded was approximately 7.8 kN, obtained from the weld produced with a 1600 rev min−1 tool rotational speed. Microstructural analyses showed the formation of a solid–liquid structure of an Al solid solution in Mg–Al-rich Zn liquid, which gives rise to the formation of Zn-rich Al region and microfissuring in some regions during welding. Exposure of steel surface to Mg–Al-rich Zn liquid led to the formation of Fe2Al5 and Fe4Al13 intermetallics. The presence of defective Zn-rich Al regions and Fe–Al intermetallics at the faying surface affects the weld strength.