Deformation Behavior of Al/Cu Clad Composite During Twist Channel Angular Pressing

Abstract

The research and development of modern metallic materials goes hand in hand with increasing their lifetime via optimized deformation processing. The presented work deals with preparation of an Al/Cu clad composite with implemented reinforcing Cu wires by the method of twist channel angular pressing (TCAP). Single and double pass extrusion of the clad composite was simulated numerically and carried out experimentally. This work is unique as no such study has been presented so far. Detailed monitoring of the deformation behavior during both the passes was enabled by superimposed grids and sensors. Both the sets of results revealed that already the single pass imparted significant effective strain (higher than e.g., conventional equal channel angular pressing (ECAP)), especially to the Al matrix, and resulted in notable deformation strengthening of both the Al and Cu composite components, which was confirmed by the increased punch load and decreased plastic flow velocity (second pass compared to first pass). Processing via the second pass also resulted in homogenization of the imposed strain and residual stress across the composite cross-section. However, the investigated parameters featured slight variations in dependence on the monitored location across the cross-section.

Selection of Die Material and Its Impact on the Multi-Material Extrusion of Bimetallic AZ31B–Ti6Al4V Components for Aeronautical Applications

“…Berski et al [10] analyzed the strain-stress state in bimetallic rods composed of Cu-Al using two different extrusion ratios in a conical die and in double reduction die. Kocich et al [11] used the method of twist channel angular pressing (TCAP) to analyze the deformation behavior of an Al/Cu clad composite.…”

Effect of Process Parameters and Definition of Favorable Conditions in Multi-Material Extrusion of Bimetallic AZ31B–Ti6Al4V Billets

“…Berski et al [11] analyzed the strain-stress state in bimetallic rods composed by Cu-Al using two different extrusion ratios in conical die and in double reduction die. A study about the deformation behavior of an Al/Cu clad composite by the method of twist channel angular pressing (TCAP) was conducted by Kocich et al [12]; whereas Rong et al [13] studied the effects on microstructure and mechanical properties of a Mg-Gd-Zn-Zr alloy manufactured by differential-thermal extrusion. Alcaraz and Sevillano [14] used Finite Element (FE) calculations to study the influence of the different extrusion variables in the bimetallic tubes composed by two different Al alloys.…”

Structural Phenomena Introduced by Rotary Swaging: A Review

“…Keeping in mind the Hall-Petch law, especially the ultra-fine grained (UFG) and nano-materials have been intensively researched (e.g., [24,25]). To achieve the final grain size in such small scales, numerous methods of severe plastic deformation (SPD)-for example, Equal Channel Angular Pressing (ECAP) [26][27][28][29][30]-various ECAP modifications [31][32][33][34][35][36][37][38][39]-High Pressure Torsion (HPT) [40,41], Friction Stir Processing (FSP) [42], or Accumulative Roll Bonding (ARB) [43,44]-and intensive plastic deformation, i.e., IPD, methods (e.g., asymmetric reduction rolling [45,46], (high speed ratio) differential speed rolling [47], and asymmetric extrusion [48], etc., have been introduced. In principle, the methods are based on imposing high, or extreme, shear strain into the processed (metallic) materials, the effect of which being that they impart (substantial) grain refinement via introducing lattice distortions and crystallographic defects leading to the development and accumulation of dislocations according to the above-described schemes (depending on the intrinsic properties of the metallic material).…”