Indentation properties of silicon carbide after neutron irradiation and helium implantation

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Abstract

The hardness, elastic modulus and fracture toughness of the CVD-SiC after neutron irradiation up to 0.4 dpa at 600°C and up to 0.6 dpa at 800°C and after He implantation up to 800 appm at 750°C were evaluated using the indentation technique. The effect of neutron irradiation was discussed with the previous data (0.2-7.7 dpa, 80-1050°C). The hardness slightly increased at all neutron irradiation doses and temperatures. It was independent on the neutron irradiation dose above a saturation value. Almost no influence of the He implantation on the hardness was observed. The rapid reduction of elastic modulus with the neutron irradiation temperature below 100°C was observed. However, it gradually recovered and showed almost the same value as the unirradiated one when irradiated above 800°C. About 35% reduction of the elastic modulus due to He implantation was observed. Small reduction of fracture toughness below 400°C, and increase with increased neutron irradiation temperature to 1000°C was observed. About 30% reduction of the fracture toughness due to He implantation was observed, which was mainly attributed to the reduction of elastic modulus and the increment of crack length under indentation.

Original languageEnglish
Article number162007
JournalIOP Conference Series: Materials Science and Engineering
Volume18
Issue numberSYMPOSIUM 10
DOIs
Publication statusPublished - 2011
Event3rd International Congress on Ceramics, ICC 2011 - Osaka, Japan
Duration: 2010 Nov 142010 Nov 18

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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