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#7207. In-situ TEM investigation of dislocation loop reaction and irradiation hardening in H2+-He+ dual-beam irradiated Mo
| February 2027 | publication date |
| Proposal available till | 11-05-2025 |
| 4 total number of authors per manuscript | 0 $ |
| The title of the journal is available only for the authors who have already paid for |
| Journal’s subject area: |
| Medicine Chemistry |
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Abstract:
Through in-situ TEM observation during 30 keV H2+-He+ dual-beam irradiation at 723 K, the reaction and transformation of dislocation loops in pure Mo were investigated, especially for [removed] loops. Irradiation could directly cause the formation of 1/2[removed] loops and [removed] loops, but 1/2[removed] loops were dominant. In-situ observation confirmed the formation mechanism of [removed] loops, including direct irradiation induced mechanism, 1/2[removed] loop direct conversion mechanism, and reaction mechanism of two 1/2[removed] loops. Meanwhile, the reaction of two 1/2[removed] loops to produce [removed] loop should not require the strict size similarity condition. The reaction between 1/2[removed] loops could also produce 1/2[removed] loop, which was essentially a process in which one loop absorbed another one. The yield strength increment caused by irradiation-induced loops was analyzed, and its saturation value reached 0.48 GPa at 0.06 dpa. Compared with single He+ irradiation, the number density and average diameter of loops increased significantly and more serious damage was caused under the synergistic effect of hydrogen and helium. The mechanism based on in-situ experimental observation was discussed in depth.
Keywords:
Dislocation loop; Hydrogen helium irradiation; In-situ TEM observation; Irradiation hardening; Molybdenum
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Abstract:
Through in-situ TEM observation during 30 keV H2+-He+ dual-beam irradiation at 723 K, the reaction and transformation of dislocation loops in pure Mo were investigated, especially for [removed] loops. Irradiation could directly cause the formation of 1/2[removed] loops and [removed] loops, but 1/2[removed] loops were dominant. In-situ observation confirmed the formation mechanism of [removed] loops, including direct irradiation induced mechanism, 1/2[removed] loop direct conversion mechanism, and reaction mechanism of two 1/2[removed] loops. Meanwhile, the reaction of two 1/2[removed] loops to produce [removed] loop should not require the strict size similarity condition. The reaction between 1/2[removed] loops could also produce 1/2[removed] loop, which was essentially a process in which one loop absorbed another one. The yield strength increment caused by irradiation-induced loops was analyzed, and its saturation value reached 0.48 GPa at 0.06 dpa. Compared with single He+ irradiation, the number density and average diameter of loops increased significantly and more serious damage was caused under the synergistic effect of hydrogen and helium. The mechanism based on in-situ experimental observation was discussed in depth.
Keywords:
Dislocation loop; Hydrogen helium irradiation; In-situ TEM observation; Irradiation hardening; Molybdenum
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