Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 18, Pages 6051-6058Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.03.096
Keywords
Strain-induced phase transformation; In situ neutron diffraction; Cobalt-based superalloy
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Funding
- National Science Foundation (NSF) [DMR - 0909037, CMMI - 0900271]
- International Materials Institutes (IMI)
- Tennessee Advanced Materials Laboratory
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0900271] Funding Source: National Science Foundation
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The strain-induced face-centered cubic (FCC)-> hexagonal-close packed (HCP) phase transformation in a cobalt-based superalloy was investigated with four in situ loading neutron-diffraction experiments: monotonic tension, monotonic compression, high-cycle fatigue, and low-cycle fatigue. The transformation onsets for the four respective cases were 685 MPa, 698 MPa, 1 cycle, and 3 cycles, respectively. The HCP phase accumulated at rates of 0.1 wt.%-MPa-1 and 0.05 wt.%-MPa-1 for the tension and compression cases, respectively. For the cyclic-loading cases, the accumulation rates were found to be inversely proportional to the number of fatigue cycles. The results under the different loading modes suggest that the phase transformation occurs according to a tensile plastic-work criterion. (C) 2011 Elsevier B.V. All rights reserved.
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