Microstructural examination of neutron, proton and self-ion irradiation damage in a model Fe9Cr alloy
<p>Transmission electron microscopy (TEM) was used to compare the microstructural defects produced in an Fe9Cr model alloy during exposure to neutrons, protons, or self-ions. Samples from the same model alloy were irradiated using fission-neutrons, 2 MeV Fe + ions or...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
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Elsevier
2020
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| _version_ | 1826294125263060992 |
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| author | Haley, JC Lozano-Perez, S de Moraes Shubeita, S Wady, P London, AJ Odette, GR Roberts, SG |
| author_facet | Haley, JC Lozano-Perez, S de Moraes Shubeita, S Wady, P London, AJ Odette, GR Roberts, SG |
| author_sort | Haley, JC |
| collection | OXFORD |
| description | <p>Transmission electron microscopy (TEM) was used to compare the microstructural defects produced in an Fe9Cr model alloy during exposure to neutrons, protons, or self-ions. Samples from the same model alloy were irradiated using fission-neutrons, 2 MeV Fe + ions or 1.2 MeV protons at similar temperatures (∼300 °C) and similar doses (∼2.0dpa). The neutron-irradiated alloy contained visible interstitial dislocation loops with <strong>b</strong> = 111, and on average ∼5 nm in size. The density varied from 2±1 × 10<sup>20</sup> m<sup>-3</sup> (in the matrix far from dislocations and boundaries) to 1.2 ± 0.3 × 10<sup>23</sup> m<sup>-3</sup> (close to helical dislocation lines). Chromium α′-phase precipitates were also identified at a density of 7.4 ± 0.4 × 10<sup>23</sup> m<sup>-3</sup>. Self-ion irradiation produced mostly homogeneously distributed dislocation loops (6–7 nm on average), and with a greater fraction of 100 loops (∼40%) than was seen in the neutron-irradiated alloy, and at a density of 6.8 ± 0.8 x10<sup>22</sup> m<sup>-3</sup>. In contrast to the loops produced by neutron irradiation, the self-ion irradiated Fe9Cr contained only vacancy-type loops. Chromium also remained in solution. Proton-irradiated Fe9Cr contained interstitial dislocation loops close to helical-dislocation segments, similar to the neutron-irradiated sample. Chromium α′-phases were also identified in the proton-irradiated sample at a density of 2.5 ± 0.3 × 10<sup>23</sup> m<sup>-3</sup>, and large voids (up to 7 nm) were found at a density over 10<sup>22</sup>m<sup>−3</sup>. Like the neutron-irradiated sample, the density of dislocation loops was also heterogeneously distributed; far from grain boundaries and dislocation lines the density was 2.5 ± 0.4 x10<sup>22</sup> m<sup>-3</sup>, while close to helical dislocation lines the density was 8.1 ± 1.3 x10<sup>22</sup> m<sup>-3</sup>.</p> |
| first_indexed | 2024-03-07T03:40:49Z |
| format | Journal article |
| id | oxford-uuid:bdd33361-df97-4052-bdc8-0694fc639459 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:40:49Z |
| publishDate | 2020 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:bdd33361-df97-4052-bdc8-0694fc6394592022-03-27T05:34:41ZMicrostructural examination of neutron, proton and self-ion irradiation damage in a model Fe9Cr alloyJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:bdd33361-df97-4052-bdc8-0694fc639459EnglishSymplectic ElementsElsevier2020Haley, JCLozano-Perez, Sde Moraes Shubeita, SWady, PLondon, AJOdette, GRRoberts, SG<p>Transmission electron microscopy (TEM) was used to compare the microstructural defects produced in an Fe9Cr model alloy during exposure to neutrons, protons, or self-ions. Samples from the same model alloy were irradiated using fission-neutrons, 2 MeV Fe + ions or 1.2 MeV protons at similar temperatures (∼300 °C) and similar doses (∼2.0dpa). The neutron-irradiated alloy contained visible interstitial dislocation loops with <strong>b</strong> = 111, and on average ∼5 nm in size. The density varied from 2±1 × 10<sup>20</sup> m<sup>-3</sup> (in the matrix far from dislocations and boundaries) to 1.2 ± 0.3 × 10<sup>23</sup> m<sup>-3</sup> (close to helical dislocation lines). Chromium α′-phase precipitates were also identified at a density of 7.4 ± 0.4 × 10<sup>23</sup> m<sup>-3</sup>. Self-ion irradiation produced mostly homogeneously distributed dislocation loops (6–7 nm on average), and with a greater fraction of 100 loops (∼40%) than was seen in the neutron-irradiated alloy, and at a density of 6.8 ± 0.8 x10<sup>22</sup> m<sup>-3</sup>. In contrast to the loops produced by neutron irradiation, the self-ion irradiated Fe9Cr contained only vacancy-type loops. Chromium also remained in solution. Proton-irradiated Fe9Cr contained interstitial dislocation loops close to helical-dislocation segments, similar to the neutron-irradiated sample. Chromium α′-phases were also identified in the proton-irradiated sample at a density of 2.5 ± 0.3 × 10<sup>23</sup> m<sup>-3</sup>, and large voids (up to 7 nm) were found at a density over 10<sup>22</sup>m<sup>−3</sup>. Like the neutron-irradiated sample, the density of dislocation loops was also heterogeneously distributed; far from grain boundaries and dislocation lines the density was 2.5 ± 0.4 x10<sup>22</sup> m<sup>-3</sup>, while close to helical dislocation lines the density was 8.1 ± 1.3 x10<sup>22</sup> m<sup>-3</sup>.</p> |
| spellingShingle | Haley, JC Lozano-Perez, S de Moraes Shubeita, S Wady, P London, AJ Odette, GR Roberts, SG Microstructural examination of neutron, proton and self-ion irradiation damage in a model Fe9Cr alloy |
| title | Microstructural examination of neutron, proton and self-ion irradiation damage in a model Fe9Cr alloy |
| title_full | Microstructural examination of neutron, proton and self-ion irradiation damage in a model Fe9Cr alloy |
| title_fullStr | Microstructural examination of neutron, proton and self-ion irradiation damage in a model Fe9Cr alloy |
| title_full_unstemmed | Microstructural examination of neutron, proton and self-ion irradiation damage in a model Fe9Cr alloy |
| title_short | Microstructural examination of neutron, proton and self-ion irradiation damage in a model Fe9Cr alloy |
| title_sort | microstructural examination of neutron proton and self ion irradiation damage in a model fe9cr alloy |
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