Effect of friction condition on flow behavior of aluminum alloys during extrusion

The mechanical mechanism of the flow behavior of aluminum alloys during extrusion process with active friction was investigated by numerical simulations and experiments. The characteristic quantities such as the second invariant of the Lode parameter (μ) and deviatoric stress tensor (J₂) were employed for the division of deformation area. The results show that when extruded with active friction, no metal flow interface forms at the container bottom, the dead metal zone completely disappears, the deformation types of the metal in the plastic deformation area change from three types to one type of tension. The homogeneity of the deformation as well as the metal flow is apparently improved, which will be helpful for extruding and promoting the quality of extrudates.