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. doi:10.1016/j.actamat.2016.09.054. 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.
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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. | ||||||||||
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Subject Keywords: | Ductility; Flow mechanisms; Grain boundary sliding; High-pressure torsion; Magnesium | ||||||||||
DOI: | 10.1016/j.actamat.2016.09.054 | ||||||||||
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: | 11 Nov 2021 05:14 |
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