Extrusion of copper clad aluminum wire

Fabrication of aluminum/copper clad composite using hot hydrostatic extrusion process and its material characteristics

“…This agrees well with previous research results. It was shown by past researchers [2,4] that the relationship between extrusion pressure, P and extrusion ratio, R can be represented by the following empirical expression: …”

“…It is well known that a hydrostatic extrusion process has many advantages over conventional extrusion processes in that extrusion can be achieved with a high extrusion ratio, large die angle, and more uniform metal flow due to excellent lubrication between the metal and die. Accordingly, extensive research has been carried out on hydrostatic extrusion in applying the technology to produce fine wires and clad materials [1][2][3][4][5][6][7].…”

The cold welding of copper to aluminum using equal channel angular extrusion (ECAE) process

“…This is because this parameter influences the magnitude of the elastic stress between the sheath and core in the bimetallic rod. As Ahmed (1978) has reported, due to different elastic properties of Cu and Al, the outer sheath prevents the complete releasing of elastic stresses in the core. Therefore, the remaining stress produces a considerable frictional shear stress between the sheath and core.…”

“…Prior to test, the tube (sheath) and the rod (core) of the loosely packed billet were degreased in acetone solution. Then, using a wire brush fixed on a milling machine the internal surface of the sheath and the surface of the core were scratch brushed to remove the contaminants and prepare a work hardened layer both on the internal surface of the sheath and the surface of the core as suggested by Ahmed (1978). The billet was ECAE-ed at room temperature to develop a cold weld between the sheath and core.…”

“…The hydrostatic extrusion of copper-aluminum composites have been performed first by Nilsson (1973). Later, Ahmed (1978) described the extrusion of copper clad aluminum wire and determined the variables that influence a sound clad extrusion. Park et al (1997) performed finite element analysis for the hydrostatic extrusion of copper-clad aluminum tubes and developed a model to predict their deformation behavior.…”