Abstract
A Cu–8 wt%Ag alloy was processed at room temperature either by high-pressure torsion (HPT) or using a two-step deformation mode of equal-channel angular pressing (ECAP) and HPT. After HPT deformation, different flow patterns were observed on the disk surface without any post-deformation treatment thereby indicating an inhomogeneous shearing deformation. The microhardness distributions throughout the disks were compared after the two different processing routes. It is shown that the microhardness remains very low near the center of the disk although saturated in the outer regions after 10 revolutions. By contrast, an intrinsically homogeneous microhardness may be attained throughout the disk after the two-step deformation of ECAP and HPT. This study suggests a convenient procedure for achieving full homogeneity in high-strength materials during HPT processing.
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Acknowledgements
This work was supported in part by the National Natural Science Foundation of China (NSFC) under Grant Nos. 50625103, 50890173, and 50931005, in part by the National Basic Research Program of China under Grant No. 2010CB631006, in part by the Royal Society of the U.K. under International Joint Project No. JP871294 and in part by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS.
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Tian, Y.Z., Zhang, Z.F. & Langdon, T.G. Achieving homogeneity in a two-phase Cu–Ag composite during high-pressure torsion. J Mater Sci 48, 4606–4612 (2013). https://doi.org/10.1007/s10853-012-7105-8
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DOI: https://doi.org/10.1007/s10853-012-7105-8