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Effect of strain-rate on the deformation response of D0 3 -ordered Fe 3 Al

Janda, D. and Ghassemi-Armaki, H. and Bruder, E. and Hockauf, M. and Heilmaier, M. and Kumar, K. S. (2016):
Effect of strain-rate on the deformation response of D0 3 -ordered Fe 3 Al.
In: Acta Materialia, 103, pp. 909-918. Pergamon-Elsevier Science Ltd, Oxford, England, ISSN 13596454,
DOI: 10.1016/j.actamat.2015.11.002,
[Article]

Abstract

The mechanical response of centrifugally cast Fe(3)A1 with the composition Fe-27A1 (at.%) containing microalloying additions of Nb, Zr, C, and B was investigated over a wide range of strain rates between 10(-4) and 10(3) s(-1) at room temperature. Tests were carried out in compression using a (i) screw-driven load frame, (ii) drop impact tester, and (iii) split-Hopkinson pressure bar at quasi-static, intermediate and dynamic strain rates respectively. Post deformation analysis was carried out by DSC, SEM/EBSD, TEM and micropillar deformation. In all instances, the stress-strain curves show initial hardening (-first 5% plastic strain) followed by a plateau in stress. A loss in work-hardening occurs at the highest strain rates examined (>10(3) s(-1)) and is likely associated with shear localization; in addition, (2 11) [11 1]-type twinning was observed at these high strain rates at room temperature. This observation is in line with previous theoretical calculations of the antiphase boundary (APB) energy. The consequence of a continuously increasing yield stress with strain rate and a loss in work hardening at the highest strain rates together yields a maximum in flow stress at the intermediate strain rate. (c) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type: Article
Erschienen: 2016
Creators: Janda, D. and Ghassemi-Armaki, H. and Bruder, E. and Hockauf, M. and Heilmaier, M. and Kumar, K. S.
Title: Effect of strain-rate on the deformation response of D0 3 -ordered Fe 3 Al
Language: English
Abstract:

The mechanical response of centrifugally cast Fe(3)A1 with the composition Fe-27A1 (at.%) containing microalloying additions of Nb, Zr, C, and B was investigated over a wide range of strain rates between 10(-4) and 10(3) s(-1) at room temperature. Tests were carried out in compression using a (i) screw-driven load frame, (ii) drop impact tester, and (iii) split-Hopkinson pressure bar at quasi-static, intermediate and dynamic strain rates respectively. Post deformation analysis was carried out by DSC, SEM/EBSD, TEM and micropillar deformation. In all instances, the stress-strain curves show initial hardening (-first 5% plastic strain) followed by a plateau in stress. A loss in work-hardening occurs at the highest strain rates examined (>10(3) s(-1)) and is likely associated with shear localization; in addition, (2 11) [11 1]-type twinning was observed at these high strain rates at room temperature. This observation is in line with previous theoretical calculations of the antiphase boundary (APB) energy. The consequence of a continuously increasing yield stress with strain rate and a loss in work hardening at the highest strain rates together yields a maximum in flow stress at the intermediate strain rate. (c) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Journal or Publication Title: Acta Materialia
Journal volume: 103
Publisher: Pergamon-Elsevier Science Ltd, Oxford, England
Uncontrolled Keywords: Iron aluminide, Strain rate, Shear localization, Twinning, Work-hardening
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Date Deposited: 27 Nov 2017 11:21
DOI: 10.1016/j.actamat.2015.11.002
Official URL: https://doi.org/10.1016/j.actamat.2015.11.002
Funders: Financial support of this work by the Bundesministerium fur Wirtschaft und Technologie (ZIM-project number: KF2593003CK0) is acknowledged., NSF Grant DMR-0520651
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