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Developing hardness and microstructural homogeneity in high-pressure torsion

Developing hardness and microstructural homogeneity in high-pressure torsion
Developing hardness and microstructural homogeneity in high-pressure torsion
High-pressure torsion (HPT) is a processing technique in which samples, in the form of thin disks, are subjected to a high applied pressure and concurrent torsional straining. In principle, the strain introduced into the disk during the straining varies across the disk and there is a direct proportionality between the estimated strain and the radial position on the disk. This means that the strain is zero at the center of each HPT disk and it reaches a maximum value at the outer periphery. Contrary to these expectations, recent experiments show there is a gradual evolution with increasing numbers of revolutions such that the hardness of the disk gradually becomes reasonably homogeneous. This report examines the development of hardness and microstructural homogeneity with special emphasis on the evolution in hardness homogeneity along vertical sections of disks of high-purity aluminum processed by HPT. The results demonstrate that, at least for pure aluminum, the distributions in the hardness values are independent of the plane of sectioning
1662-9752
1805-1810
Kawaski, Megumi
a5ca3e53-e6b0-4723-8b9c-147d2b4e6841
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawaski, Megumi
a5ca3e53-e6b0-4723-8b9c-147d2b4e6841
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Kawaski, Megumi and Langdon, T.G. (2012) Developing hardness and microstructural homogeneity in high-pressure torsion. Materials Science Forum, 706-709, 1805-1810. (doi:10.4028/www.scientific.net/MSF.706-709.1805).

Record type: Article

Abstract

High-pressure torsion (HPT) is a processing technique in which samples, in the form of thin disks, are subjected to a high applied pressure and concurrent torsional straining. In principle, the strain introduced into the disk during the straining varies across the disk and there is a direct proportionality between the estimated strain and the radial position on the disk. This means that the strain is zero at the center of each HPT disk and it reaches a maximum value at the outer periphery. Contrary to these expectations, recent experiments show there is a gradual evolution with increasing numbers of revolutions such that the hardness of the disk gradually becomes reasonably homogeneous. This report examines the development of hardness and microstructural homogeneity with special emphasis on the evolution in hardness homogeneity along vertical sections of disks of high-purity aluminum processed by HPT. The results demonstrate that, at least for pure aluminum, the distributions in the hardness values are independent of the plane of sectioning

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More information

Published date: January 2012
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 334214
URI: https://eprints.soton.ac.uk/id/eprint/334214
ISSN: 1662-9752
PURE UUID: 7d481bcb-df16-4b15-9659-3c8e7b6b516e
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 27 Apr 2012 13:59
Last modified: 20 Jul 2019 01:03

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