Effect of lubrication on deformation behavior of a superplastic material has been given little attention, although it is important for industrial application. In this paper, a superplastic 5083 Al alloy under bi-axial deformation was investigated by defor Effect of lubrication on deformation behavior of a superplastic material has been given little attention, although it is important for industrial application. In this paper, a superplastic 5083 Al alloy under bi-axial deformation was investigated by defor