Positron annihilation study of the vacancy clusters in ODS Fe–14Cr alloys
Oxide dispersion strengthened Fe14Cr and Fe14CrWTi alloys produced by mechanical alloying and hot isostatic pressing were subjected to isochronal annealing up to 1400 ºC, and the evolution and thermal stability of the vacancy type defects were investigated by positron annihilation spectroscopy. The...
| Main Authors: | , , , |
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| Format: | Journal article |
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Taylor and Francis
2017
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| _version_ | 1826265976877875200 |
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| author | Domínguez-Reyes, R Auger, M Monge, M Pareja, R |
| author_facet | Domínguez-Reyes, R Auger, M Monge, M Pareja, R |
| author_sort | Domínguez-Reyes, R |
| collection | OXFORD |
| description | Oxide dispersion strengthened Fe14Cr and Fe14CrWTi alloys produced by mechanical alloying and hot isostatic pressing were subjected to isochronal annealing up to 1400 ºC, and the evolution and thermal stability of the vacancy type defects were investigated by positron annihilation spectroscopy. The results were compared to those from a non-oxide dispersion strengthened Fe14Cr alloy produced by following the same powder metallurgy route. The long lifetime component of the positron annihilation spectra revealed the existence of tridimensional vacancy clusters, or nanovoids, in all these alloys. Two recovery stages are found in the oxide dispersion strengthened alloys irrespective of the starting conditions of the samples. The first one starting at T>750 ºC is attributed to thermal shrinkage of large vacancy clusters, or voids. A strong increase in the intensity of the long lifetime after annealing at temperatures in the 800 - 1050 ºC range indicates the development of new vacancy clusters. These defects appear to be unstable above 1050 ºC, but some of them remain at temperatures as high as 1400 ºC, at least for 90 min. |
| first_indexed | 2024-03-06T20:31:59Z |
| format | Journal article |
| id | oxford-uuid:315beb7f-bcec-4e1e-8816-630700d7cc7a |
| institution | University of Oxford |
| last_indexed | 2024-03-06T20:31:59Z |
| publishDate | 2017 |
| publisher | Taylor and Francis |
| record_format | dspace |
| spelling | oxford-uuid:315beb7f-bcec-4e1e-8816-630700d7cc7a2022-03-26T13:07:27ZPositron annihilation study of the vacancy clusters in ODS Fe–14Cr alloysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:315beb7f-bcec-4e1e-8816-630700d7cc7aSymplectic Elements at OxfordTaylor and Francis2017Domínguez-Reyes, RAuger, MMonge, MPareja, ROxide dispersion strengthened Fe14Cr and Fe14CrWTi alloys produced by mechanical alloying and hot isostatic pressing were subjected to isochronal annealing up to 1400 ºC, and the evolution and thermal stability of the vacancy type defects were investigated by positron annihilation spectroscopy. The results were compared to those from a non-oxide dispersion strengthened Fe14Cr alloy produced by following the same powder metallurgy route. The long lifetime component of the positron annihilation spectra revealed the existence of tridimensional vacancy clusters, or nanovoids, in all these alloys. Two recovery stages are found in the oxide dispersion strengthened alloys irrespective of the starting conditions of the samples. The first one starting at T>750 ºC is attributed to thermal shrinkage of large vacancy clusters, or voids. A strong increase in the intensity of the long lifetime after annealing at temperatures in the 800 - 1050 ºC range indicates the development of new vacancy clusters. These defects appear to be unstable above 1050 ºC, but some of them remain at temperatures as high as 1400 ºC, at least for 90 min. |
| spellingShingle | Domínguez-Reyes, R Auger, M Monge, M Pareja, R Positron annihilation study of the vacancy clusters in ODS Fe–14Cr alloys |
| title | Positron annihilation study of the vacancy clusters in ODS Fe–14Cr alloys |
| title_full | Positron annihilation study of the vacancy clusters in ODS Fe–14Cr alloys |
| title_fullStr | Positron annihilation study of the vacancy clusters in ODS Fe–14Cr alloys |
| title_full_unstemmed | Positron annihilation study of the vacancy clusters in ODS Fe–14Cr alloys |
| title_short | Positron annihilation study of the vacancy clusters in ODS Fe–14Cr alloys |
| title_sort | positron annihilation study of the vacancy clusters in ods fe 14cr alloys |
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