Friction stir welding of aluminium to magnesium: a critical review

Aluminium/magnesium hybrid structure has been paid increasing attention recently due to its excellent lightweight. However, aluminium/magnesium is easy to form pores, cracks, and massive intermetallic compounds when fusion welding is used. Friction stir welding is as solid-state method, which avoids the above-mentioned problems caused by fusion welding. This article systematically reviews recent progress in friction stir welding of aluminium/magnesium from temperature field, metal flow and weld composition. Moreover, the effects of control parameters on the temperature field, metal flow and weld composition are discussed objectively, respectively. Finally, this work puts forward some problems that need to be solved urgently in the future based on summarising the recent progress of friction stir welding of aluminium/magnesium.