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Structural impact on the hall-Petch relationship in an Al-5Mg alloy processed by high-pressure torsion

Structural impact on the hall-Petch relationship in an Al-5Mg alloy processed by high-pressure torsion
Structural impact on the hall-Petch relationship in an Al-5Mg alloy processed by high-pressure torsion
The evolution of microstructure and microhardness was studied in a commercial 5483 Al-5 Mg alloy processed by high pressure torsion (HPT) under a pressure of 6.0 GPa up to 10 turns. Significant grain size refinement was observed even after 1/4 turn and additional processing led to a further grain size reduction and a shift in the distribution of grain boundary misorientation angles towards higher values. An essentially fully homogeneous microstructure was reached after 10 turns with a final grain size of ~70 nm, a saturation Vickers microhardness of Hv?240 which was attained at and above equivalent strains of ~150, a relatively narrow grain size distribution and a fraction of ~80% of high-angle grain boundaries. Analysis shows the Hall-Petch plot deviates from the conventional linear relationship for samples processed through small numbers of turns but after 3 or more turns there is a direct correlation between the results obtained in HPT processing and coarse-grained samples
0921-5093
9-15
Bazarnik, Piotr
844b4a15-226a-4275-9cee-812669fa033c
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Lewandowska, Malgorzata
c574d02d-d34d-4164-8ed1-90c3d77584d2
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Bazarnik, Piotr
844b4a15-226a-4275-9cee-812669fa033c
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Lewandowska, Malgorzata
c574d02d-d34d-4164-8ed1-90c3d77584d2
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Bazarnik, Piotr, Huang, Yi, Lewandowska, Malgorzata and Langdon, Terence G. (2015) Structural impact on the hall-Petch relationship in an Al-5Mg alloy processed by high-pressure torsion. Materials Science and Engineering: A, 626, 9-15. (doi:10.1016/j.msea.2014.12.027).

Record type: Article

Abstract

The evolution of microstructure and microhardness was studied in a commercial 5483 Al-5 Mg alloy processed by high pressure torsion (HPT) under a pressure of 6.0 GPa up to 10 turns. Significant grain size refinement was observed even after 1/4 turn and additional processing led to a further grain size reduction and a shift in the distribution of grain boundary misorientation angles towards higher values. An essentially fully homogeneous microstructure was reached after 10 turns with a final grain size of ~70 nm, a saturation Vickers microhardness of Hv?240 which was attained at and above equivalent strains of ~150, a relatively narrow grain size distribution and a fraction of ~80% of high-angle grain boundaries. Analysis shows the Hall-Petch plot deviates from the conventional linear relationship for samples processed through small numbers of turns but after 3 or more turns there is a direct correlation between the results obtained in HPT processing and coarse-grained samples

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Piotr-manuscript 2014 December.pdf - Accepted Manuscript
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Published date: 25 February 2015
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 372828
URI: https://eprints.soton.ac.uk/id/eprint/372828
ISSN: 0921-5093
PURE UUID: e3a41996-8e1d-4563-a4e4-cc73ac522777
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 22 Dec 2014 11:01
Last modified: 07 Aug 2019 00:44

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