Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7881623 | Acta Materialia | 2014 | 12 Pages |
Abstract
To study the effect of γⲠprecipitate size on the deformation behaviour of a polycrystalline nickel-based superalloy, model microstructures with a unimodal γⲠsize 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 γⲠphase. 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 γⲠphase in the fine γⲠmicrostructures and for low plastic strains in the medium γⲠmicrostructures. With increasing γⲠsize and increasing degree of plastic deformation, both experimental methodologies revealed a tendency of the two phases to deform independently.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
E.M. Francis, B.M.B. Grant, J. Quinta da Fonseca, P.J. Phillips, M.J. Mills, M.R. Daymond, M. Preuss,