Journal
ACTA MATERIALIA
Volume 61, Issue 14, Pages 5144-5151Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.04.068
Keywords
High pressure; Iron; Texture; Phase transformation; Strength
Funding
- DOE-NNSA [DE-NA0001974]
- DOE-BES [DE-FG02-99ER45775, DE-AC02-06CH11357]
- NSF [EAR 0836402]
- French ANR program: Dislocations under Pressure (DIUP) program [ANR-07-5CJC-0136-01]
- Bateman Fellowship
- CDAC
- Directorate For Geosciences
- Division Of Earth Sciences [836402] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1126249] Funding Source: National Science Foundation
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Using a newly developed experimental protocol based on externally heated diamond anvil cells, in situ stress and textures studies are performed on polycrystalline body-centered cubic-(alpha-), face-centered cubic-(gamma-) and hexagonal close-packed-(epsilon-)Fe during plastic deformation up to 36 GPa and 1000 K. At 7 GPa and 973 K, alpha-Fe displays a texture attributed to dominant slip on {1 1 0}<(1) over bar 1 1 >. Upon pressure increase up to 24 GPa at constant temperature, differential stress is shown to increase to 0.6 +/- 0.1 GPa while Fe is transforming into gamma-Fe and epsilon-Fe. Textures observed in gamma-Fe are fully induced by phase transformation, with little effect of plastic deformation. Textures observed in e-Fe are the result of phase transformation from gamma-Fe combined with plastic deformation, with dominant basal (0 0 0 1)< 1 1 (2) over bar 0 > slip. The differential stress measured in epsilon-Fe is consistent with a shear strength of similar to 1.9 GPa at 17 GPa and 300 K, with a temperature dependence of -0.003 GPa K-1 and a pressure dependence of 0.074. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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