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Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

Figueiredo, Roberto B. and Sabbaghianrad, Shima and Giwa, Adenike and 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 . pp. 322-331. ISSN 1359-6454. https://resolver.caltech.edu/CaltechAUTHORS:20170105-164637698

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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 μm.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.actamat.2016.09.054DOIArticle
http://www.sciencedirect.com/science/article/pii/S1359645416307534PublisherArticle
ORCID:
AuthorORCID
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2016 Acta Materialia Inc. Received 28 July 2016, Revised 25 September 2016, Accepted 29 September 2016, Available online 14 October 2016. This work was supported in part by CNPq, FAPEMIG and CAPES of Brazil and in part by the National Science Foundation of the United States under Grant No. DMR-1160966.
Funders:
Funding AgencyGrant Number
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)UNSPECIFIED
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)UNSPECIFIED
NSFDMR-1160966
Subject Keywords:Ductility; Flow mechanisms; Grain boundary sliding; High-pressure torsion; Magnesium
Record Number:CaltechAUTHORS:20170105-164637698
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170105-164637698
Official Citation:Roberto B. Figueiredo, Shima Sabbaghianrad, Adenike Giwa, Julia R. Greer, Terence G. Langdon, Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation, Acta Materialia, Volume 122, 1 January 2017, Pages 322-331, ISSN 1359-6454, http://dx.doi.org/10.1016/j.actamat.2016.09.054. (http://www.sciencedirect.com/science/article/pii/S1359645416307534)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73286
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:06 Jan 2017 18:21
Last Modified:03 Oct 2019 16:26

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