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Developing high-pressure torsion for use with bulk samples

Developing high-pressure torsion for use with bulk samples
Developing high-pressure torsion for use with bulk samples
Experiments were conducted to examine the feasibility of extending conventional processing with high-pressure torsion (HPT) from use with thin disks with thickness of ~1 mm to bulk cylindrical samples with height of ~8 mm. Two cylindrical samples of an Al–Mg–Sc alloy were processed through 1/4 and 1 turn and then examined on different planes of sectioning. The results confirm the potential for using HPT with small cylinders but they show there are significant and systematic variations in the values of the Vickers microhardness throughout the samples after processing. After one turn in HPT, the highest values of the microhardness were achieved in the central plane around the outer edge of the sample where the hardness increased by a factor of >2 compared with the solution-treated condition. Microstructural examination revealed an array of equiaxed grains in this region with an average grain size of ~200 nm.
hardness, high-pressure torsion, severe plastic deformation, microstructure, ultrafine grains
0921-5093
268-273
Sakai, Genki
d8b77067-df2e-41e0-833f-34b4d3051a32
Nakamura, Katsuaki
cb03902d-612e-4427-9bcc-ac1c8b3777e0
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Sakai, Genki
d8b77067-df2e-41e0-833f-34b4d3051a32
Nakamura, Katsuaki
cb03902d-612e-4427-9bcc-ac1c8b3777e0
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Sakai, Genki, Nakamura, Katsuaki, Horita, Zenji and Langdon, Terence G. (2005) Developing high-pressure torsion for use with bulk samples. Materials Science and Engineering: A, 406 (1-2), 268-273. (doi:10.1016/j.msea.2005.06.049).

Record type: Article

Abstract

Experiments were conducted to examine the feasibility of extending conventional processing with high-pressure torsion (HPT) from use with thin disks with thickness of ~1 mm to bulk cylindrical samples with height of ~8 mm. Two cylindrical samples of an Al–Mg–Sc alloy were processed through 1/4 and 1 turn and then examined on different planes of sectioning. The results confirm the potential for using HPT with small cylinders but they show there are significant and systematic variations in the values of the Vickers microhardness throughout the samples after processing. After one turn in HPT, the highest values of the microhardness were achieved in the central plane around the outer edge of the sample where the hardness increased by a factor of >2 compared with the solution-treated condition. Microstructural examination revealed an array of equiaxed grains in this region with an average grain size of ~200 nm.

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More information

Published date: 2005
Keywords: hardness, high-pressure torsion, severe plastic deformation, microstructure, ultrafine grains
Organisations: Engineering Sciences

Identifiers

Local EPrints ID: 23836
URI: http://eprints.soton.ac.uk/id/eprint/23836
ISSN: 0921-5093
PURE UUID: b6063e92-a712-4b8c-88aa-9fc889a62e25
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 22 Mar 2006
Last modified: 16 Mar 2024 03:28

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Contributors

Author: Genki Sakai
Author: Katsuaki Nakamura
Author: Zenji Horita

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