Akari Yoshida, Yoji Miyajima and Susumu Onaka
Department of Materials Science and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama 226-8502
Changes in microstructure of a Cu single crystal by severe plastic deformation along a crystallographically asymmetric direction were observed. Plate-like specimens with (15 12 5) orientation cut from the single crystal were deformed by rolling and accumulative roll-bonding. When the logarithmic equivalent strain ε eq of rolling was 0.9, rotation of crystal orientation to (2 1 1)[1 ] without orientation splitting was observed inside the specimens. Although orientation splitting occurred near surfaces of the specimens, the band-like regions with near (2 1 1)[1 ] were still observed when ε eq was 3.5. When εeq was 5.0, ultrafine-grained structure similar to that in severely deformed polycrystalline Cu was observed. [doi:10.2320/jinstmet.J2013037]
severe plastic deformation, ultrafine-grained material, single crystal, microstructure
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