Modelling recrystallization and grain growth of tungsten induced by neutron displacement defects

A. Mannheim; J.A.W. van Dommelen; M.G.D. Geers

doi:10.1016/j.mechmat.2018.04.008

Modelling recrystallization and grain growth of tungsten induced by neutron displacement defects

A. Mannheim, J.A.W. van Dommelen, M.G.D. Geers

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Abstract

A multi-scale model is developed for the long-term microstructural evolution of tungsten under cascade damage conditions and for different irradiation temperatures as they may occur in a divertor of a nuclear fusion reactor. In particular the competition between damage accumulation and recovery processes, including grain growth and recrystallization are captured. A mean-field model for recrystallization and grain growth is coupled to a cluster dynamics model for the evolution of the neutron damage. The displacement damage is produced in the form of defect clusters, for which a parameterized temperature-dependent scaling law is implemented. A physically-based grain nucleation model is implemented in the mean-field recrystallization model. The competition between the various temperature dependent mechanisms and their effects on the evolving microstructure is studied in the range of T= 1000 °C - 1400 °C

Original language	English
Pages (from-to)	43-58
Number of pages	16
Journal	Mechanics of Materials
Volume	123
Early online date	20 Apr 2018
DOIs	https://doi.org/10.1016/j.mechmat.2018.04.008
Publication status	Published - 1 Aug 2018

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abstract = "A multi-scale model is developed for the long-term microstructural evolution of tungsten under cascade damage conditions and for different irradiation temperatures as they may occur in a divertor of a nuclear fusion reactor. In particular the competition between damage accumulation and recovery processes, including grain growth and recrystallization are captured. A mean-field model for recrystallization and grain growth is coupled to a cluster dynamics model for the evolution of the neutron damage. The displacement damage is produced in the form of defect clusters, for which a parameterized temperature-dependent scaling law is implemented. A physically-based grain nucleation model is implemented in the mean-field recrystallization model. The competition between the various temperature dependent mechanisms and their effects on the evolving microstructure is studied in the range of T= 1000 °C - 1400 °C",

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AB - A multi-scale model is developed for the long-term microstructural evolution of tungsten under cascade damage conditions and for different irradiation temperatures as they may occur in a divertor of a nuclear fusion reactor. In particular the competition between damage accumulation and recovery processes, including grain growth and recrystallization are captured. A mean-field model for recrystallization and grain growth is coupled to a cluster dynamics model for the evolution of the neutron damage. The displacement damage is produced in the form of defect clusters, for which a parameterized temperature-dependent scaling law is implemented. A physically-based grain nucleation model is implemented in the mean-field recrystallization model. The competition between the various temperature dependent mechanisms and their effects on the evolving microstructure is studied in the range of T= 1000 °C - 1400 °C

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