4.8 Article

Proton irradiation-decelerated intergranular corrosion of Ni-Cr alloys in molten salt

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NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/s41467-020-17244-y

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  1. Transatomic Power Corporation [023875-001]
  2. US Department of Energy Nuclear Energy University Program (NEUP) [327075-875J]
  3. FUTURE (Fundamental Understanding of Transport Under Reactor Extremes), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences
  4. Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the U.S. Department of Energy within the Mechanical Behavior of Materials program at the Lawrence Berkeley National Laboratory [DE-AC02-05-CH11231, KC 13]
  5. Molecular Foundry at Lawrence Berkeley National Laboratory - U.S. Department of Energy [DE-AC02-05-CH11231]

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The effects of ionizing radiation on materials often reduce to bad news. Radiation damage usually leads to detrimental effects such as embrittlement, accelerated creep, phase instability, and radiation-altered corrosion. Here we report that proton irradiation decelerates intergranular corrosion of Ni-Cr alloys in molten fluoride salt at 650 degrees C. We demonstrate this by showing that the depth of intergranular voids resulting from Cr leaching into the salt is reduced by proton irradiation alone. Interstitial defects generated from irradiation enhance diffusion, more rapidly replenishing corrosion-injected vacancies with alloy constituents, thus playing the crucial role in decelerating corrosion. Our results show that irradiation can have a positive impact on materials performance, challenging our view that radiation damage usually results in negative effects.

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