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.
Highlights
As regards to intensive plastic deformation processing, the main focus has been on conventionalFe-based materials, non-ferrous metals are given attention, too, primarily due to their wide applicability in various industrial branches
The aims of the processing are similar regardless of the used material: the materials subjected to intensive plastic deformation are prepared to meet high demands, including the one on having ultra-fine-grained structures (UFG)
The aim of the work was to provide a detailed characterization of the effects of twist channel angular pressing (TCAP) processing on the Al/Cu clad composite (Figure 1)
Summary
As regards to intensive plastic deformation processing, the main focus has been on conventionalFe-based materials, non-ferrous metals are given attention, too, primarily due to their wide applicability in various industrial branches. The aims of the processing are similar regardless of the used material: the materials subjected to intensive plastic deformation are prepared to meet high demands, including the one on having ultra-fine-grained structures (UFG). The decrease in plastic properties in very fine-grained materials is related to the combination of low deformation strengthening rate, and low value of strain rate sensitivity coefficient (m). The high deformation strengthening rate results in accumulation of dislocations inside the grains, which, in combination with high strain rate sensitivity coefficient m, significantly suppresses the development of material failure during deformation processing and increases plasticity of the material during forming. Ways how to achieve combinations of high strength and high plasticity exist; such material behavior is characterized as the strength and ductility
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