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Characterization of γ' Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD.
- Source :
-
Materials (Basel, Switzerland) [Materials (Basel)] 2020 May 22; Vol. 13 (10). Date of Electronic Publication: 2020 May 22. - Publication Year :
- 2020
-
Abstract
- In situ X-ray diffraction and transmission electron microscopy has been used to investigate René 108 Ni-based superalloy after short-term annealing at high-homologous temperatures. Current work is focused on characterisation of γ' precipitates, their volume fraction, evolution of the lattice parameter of γ and γ' phases and misfit parameter of γ' in the matrix. Material in the initial condition is characterised by a high-volume fraction (over 63%) of γ' precipitates. Irregular distribution of alloying elements was observed. Matrix channels were strongly enriched in Cr, Co, W and Mo, whereas precipitates contain large amount of Al, Ti, Ta and Hf. Exposure to high-homologous temperatures in the range 1100-1250 °C led to the dissolution of the precipitates, which influenced the change of lattice parameter of both γ and γ' phases. The lattice parameter of the matrix continuously grew during holding at high temperatures, which had a dominant influence on the more negative misfit coefficient.
Details
- Language :
- English
- ISSN :
- 1996-1944
- Volume :
- 13
- Issue :
- 10
- Database :
- MEDLINE
- Journal :
- Materials (Basel, Switzerland)
- Publication Type :
- Academic Journal
- Accession number :
- 32455991
- Full Text :
- https://doi.org/10.3390/ma13102397