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Recovery of Damage Structures in a Fe-Based Fe-Cr-Mn-Cu-Mo Multi-Component Alloy During Annealing

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Document pages: 20 pages

Abstract: A Fe-based multi-component alloy, 60Fe-12Cr-10Mn-15Cu-3Mo, which presents higher yield stress than typical stainless steels (such as 304, 316, and 340), was used to investigate the thermal stability of irradiation-induced defects. Neutron irradiation was carried out at approximately 323 and 643 K using up to 1.3 × 10−3 and 4.6 × 10−4 dpa (displacements per atom), respectively. While no defects were formed at the high temperature of 643 K, single vacancies were formed after irradiation at the low temperature of 323 K and 1.3 × 10−3 dpa, and the vacancies became mobile at 423 K. However, as the annealing temperature increased the size of vacancy clusters decreased. Coincidence Doppler broadening measurements indicated that the formation of Cu precipitates became prominent while annealing the irradiated sample at 323 K. The disappearance of vacancy clusters was attributed to the formation of Cu precipitates at vacancy clusters. Recovery of vacancy clusters at 573 K, which was not a high temperature, was also observed even in the sample that was irradiated using 2.5 MeV Fe ions at room temperature to 0.5 dpa at damage peak. These results indicated that the irradiation resistance of multi-component alloy, 60Fe-12Cr-10Mn-15Cu-3Mo, was good.

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