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Ultrafine grains and the Hall-Petch relationship in an Al-Mg-Si alloy processed by high-pressure torsion

Ultrafine grains and the Hall-Petch relationship in an Al-Mg-Si alloy processed by high-pressure torsion
Ultrafine grains and the Hall-Petch relationship in an Al-Mg-Si alloy processed by high-pressure torsion
Experiments were conducted to evaluate the evolution of hardness and microstructure in a commercial Al–0.6% Mg–0.4% Si alloy during processing by high-pressure torsion (HPT). The HPT was conducted under a pressure of 6.0 GPa and disks were torsionally strained to a maximum of 20 turns. It is shown that processing by HPT leads to microstructural refinement with an average grain size of ?250 nm and to an increase in hardness up to a saturation value at equivalent strains above ?100. There is a deviation in the Hall–Petch relationship at grain sizes smaller than ?500 nm and this is consistent with an earlier suggestion that a breakdown may occur if there is an easy movement of the extrinsic dislocations in the non-equilibrium grain boundaries introduced by HPT processing.
0921-5093
139-145
Loucif, Aicha
7c204a3c-bb6e-4911-be4d-234eb9a112d3
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Baudin, Thierry
448e215d-c156-4c0a-9a3a-04078a7174b8
Brisset, Francois
b9f69e75-4055-44be-8b62-497b12873d51
Chemam, Rafik
fb967267-0dfd-470a-b3ed-2facb611f3ec
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Loucif, Aicha
7c204a3c-bb6e-4911-be4d-234eb9a112d3
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Baudin, Thierry
448e215d-c156-4c0a-9a3a-04078a7174b8
Brisset, Francois
b9f69e75-4055-44be-8b62-497b12873d51
Chemam, Rafik
fb967267-0dfd-470a-b3ed-2facb611f3ec
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Loucif, Aicha, Figueiredo, Roberto B., Baudin, Thierry, Brisset, Francois, Chemam, Rafik and Langdon, Terence G. (2012) Ultrafine grains and the Hall-Petch relationship in an Al-Mg-Si alloy processed by high-pressure torsion. Materials Science and Engineering: A, 532, 139-145. (doi:10.1016/j.msea.2011.10.074).

Record type: Article

Abstract

Experiments were conducted to evaluate the evolution of hardness and microstructure in a commercial Al–0.6% Mg–0.4% Si alloy during processing by high-pressure torsion (HPT). The HPT was conducted under a pressure of 6.0 GPa and disks were torsionally strained to a maximum of 20 turns. It is shown that processing by HPT leads to microstructural refinement with an average grain size of ?250 nm and to an increase in hardness up to a saturation value at equivalent strains above ?100. There is a deviation in the Hall–Petch relationship at grain sizes smaller than ?500 nm and this is consistent with an earlier suggestion that a breakdown may occur if there is an easy movement of the extrinsic dislocations in the non-equilibrium grain boundaries introduced by HPT processing.

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More information

e-pub ahead of print date: 25 October 2011
Published date: 15 January 2012
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 334212
URI: https://eprints.soton.ac.uk/id/eprint/334212
ISSN: 0921-5093
PURE UUID: 3b8f2e1a-3318-46a0-89d1-6f19bccbcbb2
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 06 Mar 2012 14:33
Last modified: 20 Jul 2019 01:03

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