Coupling of radiation and grain boundary corrosion in SiC

Jianqi Xi, Hongliang Zhang, Ranran Su, Shuguang Wei, Xuanxin Hu, Benoit Queylat, Taeho Kim, Adrien Couet, Izabela Szlufarska

Research output: Contribution to journalArticlepeer-review

Abstract

Radiation and corrosion can be coupled to each other in non-trivial ways and such coupling is of critical importance for the performance of materials in extreme environments. However, it has been rarely studied in ceramics and therefore it is not well understood to what extent these two phenomena are coupled and by what mechanisms. Here, we discover that radiation-induced chemical changes at grain boundaries of ceramics can have a significant (and positive) impact on the corrosion resistance of these materials. Specifically, we demonstrate using a combination of experimental and simulation studies that segregation of C to grain boundaries of silicon carbide leads to improved corrosion resistance. Our results imply that tunning of stoichiometry at grain boundaries either through the sample preparation process or via radiation-induced segregation can provide an effective method for suppressing surface corrosion.

Original languageEnglish (US)
Article number16
Journalnpj Materials Degradation
Volume8
Issue number1
DOIs
StatePublished - Dec 2024
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry (miscellaneous)
  • Materials Science (miscellaneous)
  • Materials Chemistry

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