Print Email Facebook Twitter Microstructure and dislocation structure evolution during creep life of Ni-based single crystal superalloys Title Microstructure and dislocation structure evolution during creep life of Ni-based single crystal superalloys Author Yu, H. (TU Delft Novel Aerospace Materials) Xu, W. (TU Delft Novel Aerospace Materials; Northeastern University) van der Zwaag, S. (TU Delft Novel Aerospace Materials) Date 2020 Abstract The high performance of Ni single crystal superalloys during high temperature low stress creep service, is intrinsically determined by the combined effects of microstructural evolution and the dislocation behaviour. In the field of the evolution of dislocation network, two main recovery mechanism based on dislocation migration dominate the process. One is superdislocations shearing into γ’ rafts through a two-superpartials-assisted approach. Another is the compact dislocations migrating along γ/γ′ interface. These two mechanisms are similarly climb-rate-controlled process. In this work, a model for the minimum creep rate based on thermodynamic and kinetic calculations and using an existing detailed dislocation dynamics model has been built by taking the dislocation migration behaviours as well as the rafted microstructure into consideration, which can well reproduce the ([100] tensile) creep properties of existing Ni superalloy grades, without the need to make the dislocation parameter values composition dependent. Subject Dislocation behaviourMicrostructure evolutionNi superalloys To reference this document use: http://resolver.tudelft.nl/uuid:f87a8f10-4935-4959-b132-e1ede778e67d DOI https://doi.org/10.1016/j.jmst.2019.11.028 Embargo date 2021-01-01 ISSN 1005-0302 Source Journal of Materials Science & Technology: an international journal in the field of materials science, 45, 207-214 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2020 H. Yu, W. Xu, S. van der Zwaag Files PDF 1_s2.0_S1005030220300992_main.pdf 1.87 MB Close viewer /islandora/object/uuid:f87a8f10-4935-4959-b132-e1ede778e67d/datastream/OBJ/view