Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation
Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation
An investigation was conducted to examine the mechanical behavior and microstructure evolution during deformation of ultrafine-grained pure magnesium at low temperatures within the temperature range of 296–373 K. Discs were processed by high-pressure torsion until saturation in grain refinement. Dynamic hardness testing revealed a gradual increase in strain rate sensitivity up to m ? 0.2. High ductility was observed in the ultrafine-grained magnesium including an exceptional elongation of ?360% in tension at room temperature and stable deformation in micropillar compression. Grain coarsening and an increase in frequency of grain boundaries with misorientations in the range 15°–45° occurred during deformation in tension. The experimental evidence, when combined with an analysis of the deformation behavior, suggests that grain boundary sliding plays a key role in low strain rate deformation of pure magnesium when the grain sizes are at and below ?5 ?m.
322-331
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Sabbaghianrad, Shima
2dbc35ee-f341-42fd-9081-94ef3e9b10b0
Giwa, Adenike
3a83d8fe-224d-4192-8c21-8611f280c1ec
Greer, Julia R.
b1aae925-9c61-49ba-a040-ceaf2b0fc979
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
1 January 2017
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Sabbaghianrad, Shima
2dbc35ee-f341-42fd-9081-94ef3e9b10b0
Giwa, Adenike
3a83d8fe-224d-4192-8c21-8611f280c1ec
Greer, Julia R.
b1aae925-9c61-49ba-a040-ceaf2b0fc979
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B., Sabbaghianrad, Shima, Giwa, Adenike, Greer, Julia R. and Langdon, Terence G.
(2017)
Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation.
Acta Materialia, 122, .
(doi:10.1016/j.actamat.2016.09.054).
Abstract
An investigation was conducted to examine the mechanical behavior and microstructure evolution during deformation of ultrafine-grained pure magnesium at low temperatures within the temperature range of 296–373 K. Discs were processed by high-pressure torsion until saturation in grain refinement. Dynamic hardness testing revealed a gradual increase in strain rate sensitivity up to m ? 0.2. High ductility was observed in the ultrafine-grained magnesium including an exceptional elongation of ?360% in tension at room temperature and stable deformation in micropillar compression. Grain coarsening and an increase in frequency of grain boundaries with misorientations in the range 15°–45° occurred during deformation in tension. The experimental evidence, when combined with an analysis of the deformation behavior, suggests that grain boundary sliding plays a key role in low strain rate deformation of pure magnesium when the grain sizes are at and below ?5 ?m.
Text
__filestore.soton.ac.uk_users_yh2a10_mydocuments_RBF-AM-accepted manuscript.pdf
- Accepted Manuscript
More information
Accepted/In Press date: 29 September 2016
e-pub ahead of print date: 14 October 2016
Published date: 1 January 2017
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 401147
URI: http://eprints.soton.ac.uk/id/eprint/401147
ISSN: 1359-6454
PURE UUID: c47417d2-c355-4ab6-9ec6-4dea458960d5
Catalogue record
Date deposited: 18 Oct 2016 16:03
Last modified: 15 Mar 2024 05:57
Export record
Altmetrics
Contributors
Author:
Roberto B. Figueiredo
Author:
Shima Sabbaghianrad
Author:
Adenike Giwa
Author:
Julia R. Greer
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
