Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 4-5, Pages 1987-1993Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.10.061
Keywords
Strain-induced phase transformation; In situ neutron diffraction; Line-profile analysis; Stacking faults
Categories
Funding
- National Science Foundation at The University of Tennessee [DMR-0231320, DGE-9987548, EEC-9527527, EEC-0203415, DMR-0909037, CMMI-0900271]
- Tennessee Advanced Materials Laboratory
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0900271] Funding Source: National Science Foundation
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A complimentary set of experiments, in situ neutron diffraction and ex situ synchrotron X-ray diffraction, were used to study the phase-transformation and subgrain-deformation characteristics of a cobalt-based superalloy. The neutron diffraction indicated a strain-induced phase transformation in the cobalt-based superalloy under uniaxial tension and compression. The synchrotron X-ray diffraction revealed stacking-fault accumulation and twinning under the same loading conditions. The extent of transformation was found to be greater under tension than under compression. Tensile plastic strains below 2% were accommodated by the stacking-fault creation, while those greater than 2% were accommodated by the phase transformation. Twinning was found to be more active under compressive loading than under tensile loading. (C) 2010 Elsevier B.V. All rights reserved.
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