4.7 Article

Improving the exploration of vacancy evolution in P92 alloy under Fe ion irradiation using positron annihilation

Journal

JOURNAL OF NUCLEAR MATERIALS
Volume 565, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jnucmat.2022.153714

Keywords

Heavy ion irradiation; Vacancy evolution; Positron annihilation; P92 alloy

Funding

  1. National Key RD Project [2019YFA021000]
  2. National Natural Science Foundation of China [11775236, 11975246]

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The study investigated the irradiation effects of P92 alloy at different temperatures and doses, revealing the pinning effect of Cr on dislocation loops in Fe9Cr alloy irradiated at 300°C and the hindrance of carbon-vacancy complexes on the reduction of the S parameter in the P92 alloy.
P92 alloy, a candidate structural material for supercritical water reactors, was irradiated with 1 MeV Fe ions at 1, 3, and 7 dpa at room temperature, 300, 450, and 550 degrees C. Slow positron beam Doppler broadening spectroscopy was used to characterize the evolution of the open-volume defects. Irradiation of the Fe9Cr alloy at 300 degrees C induced an unexcepted phenomenon in which the S parameter decreased with an increasing irradiation dose; the phenomenon was ascribed to the pinning effect of Cr on dislocation loops, which promoted the recovery of vacancies. Whereas the reduction in the S parameter was generally inhibited in the P92 alloy. These distinctions are related to the evolution of vacancies. We show that the migration of vacancies hindered by C atoms is mainly related to carbon-vacancy complexes in the P92 alloy at approximately 300 degrees C. As the irradiation temperature increased, the complexes gradually dissociated, and the vacancies were captured and annihilated with interstitial atoms. A better understanding of the evolution of vacancies is helpful for investigating irradiation swelling.(c) 2022 Elsevier B.V. All rights reserved.

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