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Effect of numbers of turns of high‐pressure torsion on the development of exceptional ductility in pure magnesium

Effect of numbers of turns of high‐pressure torsion on the development of exceptional ductility in pure magnesium
Effect of numbers of turns of high‐pressure torsion on the development of exceptional ductility in pure magnesium
The low ductility of magnesium at room temperature is usually attributed to an insufficient number of independent slip systems. Recent research has shown that refining the grain structure of pure magnesium promotes a breakdown in the Hall‐Petch relationship at low strain rates and may lead to the development of exceptional ductilities. This report describes the evolution of microstructure and the mechanical behaviour of pure magnesium using different amounts of imposed plastic deformation by high‐pressure torsion (HPT). It is shown that the initial coarse grains undergo twinning followed by a gradual grain refinement. The flow stress at low strain rates decreases as the grain size is reduced, thereby confirming an inverse Hall‐Petch behaviour. The elongation to failure increases with grain refinement and elongations over 300% are achieved after 1/2 turn of HPT. These experimental data agree with a model for the low temperature deformation behaviour of fine‐grained pure magnesium.
Hall–Petch breakdown, ductility, high-pressure torsion, magnesium, ultrafine grains
1438-1656
1-7
Figueiredo, Roberto B.
184313b8-9f00-451a-bfb1-6d80a2c89b78
Pereira, Pedro Henrique R.
f033a8a6-ddad-4f6a-91ec-521a3358e4c2
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B.
184313b8-9f00-451a-bfb1-6d80a2c89b78
Pereira, Pedro Henrique R.
f033a8a6-ddad-4f6a-91ec-521a3358e4c2
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Figueiredo, Roberto B., Pereira, Pedro Henrique R. and Langdon, Terence G. (2020) Effect of numbers of turns of high‐pressure torsion on the development of exceptional ductility in pure magnesium. Advanced Engineering Materials, 22 (1), 1-7, [1900565]. (doi:10.1002/adem.201900565).

Record type: Article

Abstract

The low ductility of magnesium at room temperature is usually attributed to an insufficient number of independent slip systems. Recent research has shown that refining the grain structure of pure magnesium promotes a breakdown in the Hall‐Petch relationship at low strain rates and may lead to the development of exceptional ductilities. This report describes the evolution of microstructure and the mechanical behaviour of pure magnesium using different amounts of imposed plastic deformation by high‐pressure torsion (HPT). It is shown that the initial coarse grains undergo twinning followed by a gradual grain refinement. The flow stress at low strain rates decreases as the grain size is reduced, thereby confirming an inverse Hall‐Petch behaviour. The elongation to failure increases with grain refinement and elongations over 300% are achieved after 1/2 turn of HPT. These experimental data agree with a model for the low temperature deformation behaviour of fine‐grained pure magnesium.

Text
Figueiredo-AEM-2020 - Accepted Manuscript
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More information

e-pub ahead of print date: 16 July 2019
Published date: 1 January 2020
Additional Information: Special Issue: Dedicated to Terence G. Langdon on the Occasion of his 80th Birthday
Keywords: Hall–Petch breakdown, ductility, high-pressure torsion, magnesium, ultrafine grains

Identifiers

Local EPrints ID: 437894
URI: http://eprints.soton.ac.uk/id/eprint/437894
ISSN: 1438-1656
PURE UUID: 8511ce81-423e-4352-9270-933c88866c9f
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 21 Feb 2020 17:31
Last modified: 18 Feb 2021 16:59

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