Reversal from Depletion to Enrichment of Solute Elements in Radiation-Induced Segregation at Grain Boundaries
| Autor: | W. Kesternich, A. Garcia-Borquez, G. Crecelius |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Intergranular corrosion engineering.material Condensed Matter Physics Microstructure Mechanics of Materials Chemical physics engineering General Materials Science Grain boundary Microalloyed steel Irradiation Stress corrosion cracking Dislocation Grain boundary strengthening |
| Zdroj: | Materials Science Forum. :149-152 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.294-296.149 |
| Popis: | Ni ++ ion irradiations of a Nb-stabilized steel of type 1.4981 were performed at 400, 500, and 600°. Dislocation loop evolution with increasing dose and radiation-induced segregation at grain boundaries were observed by transmission electron microscopy. At low doses the typical radiation-induced segregation behaviour at grain boundaries, as commonly observed in steels and Fe-Ni-Cr alloys, is confirmed. At high doses the segregation behaviour at grain boundaries was found to be completely inverted, i.e. elements which were radiation-enriched at the grain boundaries at low doses were now depleted and vice versa. This is attributed to the formation and growth of radiation-induced precipitates with increasing dose. The precipitates were only found after irradiation at 500 and 600°C and to doses higher than 5 dpa. They are rich in Ni, Si, and Nb. The effect of inverse radiation-induced segregation at grain boundaries could possibly be useful for solving the problems arising from radiation-assisted sensitization and stress corrosion cracking. |
| Databáze: | OpenAIRE |
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