Spatial distribution of primary radiation damage in microstructures

The leading theory of primary radiation damage in materials, by Norgett, Robinson, and Torrens (NRT), assumes that materials are homogeneous. This is inadequate for most engineering materials, which have rich microstructures. The lack of alternative theories has led to the widespread assumption that...

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Bibliographic Details
Published in:Npj Materials degradation 2023-04, Vol.7 (1), p.23-8, Article 23
Main Authors: Brand, Matthew I., Obbard, Edward G., Burr, Patrick A.
Format: Article
Language:English
Subjects:
639/301
639/301/1023
639/301/1034/1037
Approximation
Chemistry and Materials Science
Corrosion and Coatings
Crystal defects
Damage localization
Electrochemistry
Energy
Engineering
Grain size
Interfaces
Localization
Materials Science
Methods
Microstructure
Precipitates
Radiation
Radiation damage
Simulation
Spatial distribution
Structural Materials
Superalloys
Temperature effects
Tribology
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Summary:The leading theory of primary radiation damage in materials, by Norgett, Robinson, and Torrens (NRT), assumes that materials are homogeneous. This is inadequate for most engineering materials, which have rich microstructures. The lack of alternative theories has led to the widespread assumption that the microstructure only affects defect recombination and not defect production. We extend the NRT formalism to account for microstructural variations and explicitly include the damage caused in a phase by primary knock-on atoms that are produced in another nearby phase. Our approach reveals new insight on the interplay between radiation damage and microstructure, and converges to conventional NRT at suitably large length-scales. Applying it to real two-phase nuclear alloys we discover a reversal of primary radiation damage localisation when grain size is 
ISSN:2397-2106
2397-2106
DOI:10.1038/s41529-023-00337-6