Equal Channel Angular Pressing of Cu-Al Bimetallic Rod

Abstract

Coextrusion and corolling are the major processes to produce bimetallic rods, tubes and wires, the objective being to perform clad metals, bimetallic joints or seals. The aim of the present work is to produce bimetallic rods showing an ultrafine grained microstructure with enhanced properties. Bimetallic Cu-Al rods were deformed by equal channel angular pressing (ECAP) in order to study their microstructure. ECAP is an interesting process for producing bulk materials with refined microstructure and, consequently, changes in physical, chemical and mechanical properties can be observed. Higher shear strength and dimensional stability are among the advantages of this process. A comparative experimental study of pure commercial copper with cylindrical inner aluminium rods of different diameters processed by one-pass equal channel angular pressing has been carried out. The ECAP die used in this research was a 90º 2-channels intersecting angle. Electron backscattered (EBSD) and X-ray diffraction techniques were used for microstructure characterization (deformation, grain fragmentation and microstrain evaluation) at the interfaces and away from them. It was found that the microstructure in the ECAP deformed Cu-Al bimetallic rods was influenced by the dimensions of the aluminium inner rod. In fact, the microstructure appeared to be much more elongated and refined in the samples containing smaller diameter aluminium rods.

Icrostructure Evolution of Steel-Aluminum Wire During Deformation by "Equal-Channel Angular Pressing-Drawing"method

“…Currently, bimetallic materials representing a combination of metals or alloys with different physical and mechanical properties are widely used in various industries around the world [1][2][3]. The metal products obtained from these materials, including rods and wire, determine the safety and reliability of the functioning of railways, telephone wires, cables, objects of the defense industry, aviation, etc.…”

Characterization of the interface of co‐extruded asymmetric aluminum‐titanium composite profiles

“…Studies on the co‐extrusion using the equal channel angular pressing process were already performed on the material combinations Al99.95–Cu99.95 and the magnesium alloy AZ31–Al99,95 . It was shown that with both material combinations simple compound profiles with the equal channel angular pressing process could be produced.…”