High-temperature deformation mechanisms in a polycrystalline nickel-base superalloy studied by neutron diffraction and electron microscopy
| Autor: | Michael Preuss, J. Quinta da Fonseca, Mark R. Daymond, Elisabeth Francis, Benedict M.B. Grant, Patrick J. Phillips, Michael J. Mills |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Polymers and Plastics Neutron diffraction Metallurgy Metals and Alloys Microstructure Electronic Optical and Magnetic Materials Superalloy Deformation mechanism Transmission electron microscopy Phase (matter) Ceramics and Composites Crystallite High-temperature deformation Composite material Deformation (engineering) Elasto-plastic self-consistent (EPSC) model Nickel-base superalloy |
| Zdroj: | Francis, E M, Grant, B M B, Quinta da Fonseca, J, Phillips, P J, Mills, M J, Daymond, M R & Preuss, M 2014, ' High-temperature deformation mechanisms in a polycrystalline nickel-base superalloy studied by neutron diffraction and electron microscopy ' Acta Materialia, vol. 74, no. 1, pp. 18-29 . https://doi.org/10.1016/j.actamat.2014.04.028 Francis, E M, Grant, B M B, Quinta da Fonseca, J, Phillips, P J, Mills, M J, Daymond, M R & Preuss, M 2014, ' High-temperature deformation mechanisms in a polycrystalline nickel-base superalloy studied by neutron diffraction and electron microscopy ', Acta Materialia, vol. 74, no. 1, pp. 18-29 . https://doi.org/10.1016/j.actamat.2014.04.028 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2014.04.028 |
| Popis: | To study the effect of γ′ precipitate size on the deformation behaviour of a polycrystalline nickel-based superalloy, model microstructures with a unimodal γ′ size distribution were developed and subjected to loading experiments at 750 °C. Neutron diffraction measurements were carried out during loading to record the elastic lattice strain response of the γ and γ′ phase. A two-site elasto-plastic self-consistent model (EPSC) assisted in the interpretation of the elastic lattice strain response. In addition, the microstructures of the deformed specimens were analysed by (scanning) transmission electron microscopy (STEM). Excellent agreement was found between the EPSC and STEM results regarding a joint deformation of the γ and γ′ phase in the fine γ′ microstructures and for low plastic strains in the medium γ′ microstructures. With increasing γ′ size and increasing degree of plastic deformation, both experimental methodologies revealed a tendency of the two phases to deform independently. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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