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An investigation of hardness homogeneity throughout disks processed by high-pressure torsion

An investigation of hardness homogeneity throughout disks processed by high-pressure torsion
An investigation of hardness homogeneity throughout disks processed by high-pressure torsion
Experiments were conducted on high-purity aluminum to determine the degree of hardness homogeneity attained during processing by high-pressure torsion (HPT). The HPT processing was conducted at room temperature using several disks of identical initial thickness with an applied pressure of 6.0 GPa and torsional straining from 1/4 to 20 turns. Following HPT, the flow patterns were observed by optical microscopy and values of the Vickers microhardness were recorded on different planes. The results show that, for any selected processing conditions, the distributions of microhardness values and the appearance of the etched surfaces in optical microscopy are independent of the plane of sectioning within the HPT disks. There is also a gradual evolution in homogeneity with increasing numbers of revolutions so that the microhardness values reach a constant value after 20 turns
1359-6454
308-316
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Kawasaki, Megumi, Figueiredo, Roberto B. and Langdon, Terence G. (2011) An investigation of hardness homogeneity throughout disks processed by high-pressure torsion. Acta Materialia, 59 (1), 308-316. (doi:10.1016/j.actamat.2010.09.034).

Record type: Article

Abstract

Experiments were conducted on high-purity aluminum to determine the degree of hardness homogeneity attained during processing by high-pressure torsion (HPT). The HPT processing was conducted at room temperature using several disks of identical initial thickness with an applied pressure of 6.0 GPa and torsional straining from 1/4 to 20 turns. Following HPT, the flow patterns were observed by optical microscopy and values of the Vickers microhardness were recorded on different planes. The results show that, for any selected processing conditions, the distributions of microhardness values and the appearance of the etched surfaces in optical microscopy are independent of the plane of sectioning within the HPT disks. There is also a gradual evolution in homogeneity with increasing numbers of revolutions so that the microhardness values reach a constant value after 20 turns

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More information

e-pub ahead of print date: 18 October 2010
Published date: January 2011
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 300286
URI: http://eprints.soton.ac.uk/id/eprint/300286
ISSN: 1359-6454
PURE UUID: bc4a793b-3f0a-4b11-9679-cff718b9508b
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 22 Feb 2012 10:01
Last modified: 15 Mar 2024 03:13

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Contributors

Author: Megumi Kawasaki
Author: Roberto B. Figueiredo

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