Direct cold extrusion of clad materials using a disc technique

Abstract

Billets of HE9 aluminium alloy (Al-Mg-Si) with metal discs placed adjacent to the die face were extruded through axisymmetric circular dies at room temperature. The resulting extrusion was an aluminium alloy rod encapsulated by the disc material. Tests were carried out to establish the nature of the coating and the effect on the flow pattern caused by the discs. Based on the flow pattern observed, an upper-bound solution is proposed and the results compared with the actual loads recorded.