TY - GEN
T1 - Application of high pressure torsion to bulk samples
AU - Sakai, Genki
AU - Nakamura, Katsuaki
AU - Horita, Zenji
AU - Langdon, Terence G.
PY - 2006
Y1 - 2006
N2 - High pressure torsion (HPT) is a well-known procedure to impart severe plastic deformation (SPD) into metallic materials. It was reported that HPT produces grain sizes finer than those using other SPD processes such as equal-channel angular pressing (ECAP). However, the application of HPT has been restricted to thin disk samples. In this study, an HPT process was developed for use with bulk samples. This process is designated as Bulk-HPT for comparison with conventional Disk-HPT. Cylindrical samples of an Al-3%Mg-0.2%Sc alloy having dimensions of 10 mm in diameter and 8.6 mm in height were prepared for Bulk-HPT. The samples were strained under a pressure of 1 GPa for 2 turns at room temperature. Microstractural observations revealed that the samples contained regions having a grain size of ∼ 130 nm. Tensile testing showed a superplastic ductility ∼480 % at 673 K with an initial strain rate of 3.3×10-2 s-1.
AB - High pressure torsion (HPT) is a well-known procedure to impart severe plastic deformation (SPD) into metallic materials. It was reported that HPT produces grain sizes finer than those using other SPD processes such as equal-channel angular pressing (ECAP). However, the application of HPT has been restricted to thin disk samples. In this study, an HPT process was developed for use with bulk samples. This process is designated as Bulk-HPT for comparison with conventional Disk-HPT. Cylindrical samples of an Al-3%Mg-0.2%Sc alloy having dimensions of 10 mm in diameter and 8.6 mm in height were prepared for Bulk-HPT. The samples were strained under a pressure of 1 GPa for 2 turns at room temperature. Microstractural observations revealed that the samples contained regions having a grain size of ∼ 130 nm. Tensile testing showed a superplastic ductility ∼480 % at 673 K with an initial strain rate of 3.3×10-2 s-1.
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U2 - 10.4028/0-87849-985-7.391
DO - 10.4028/0-87849-985-7.391
M3 - Conference contribution
AN - SCOPUS:33646529861
SN - 0878499857
SN - 9780878499854
T3 - Materials Science Forum
SP - 391
EP - 396
BT - Nanomaterials by Severe Plastic Deformation, NanoSPD3 - Proceedings of the 3rd International Conference on Nanomaterials by Severe Plastics Deformation
PB - Trans Tech Publications Ltd
T2 - 3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3
Y2 - 22 September 2005 through 26 September 2005
ER -