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Mechanical Properties of -SiC After Si- and Dual Si + He-Ion Irradiation at Various Temperatures

Kyeong Hwan Park, Sosuke Kondo, Yutai Katoh, Akira Kohyama

Fusion Science and Technology / Volume 44 / Number 2 / September 2003 / Pages 455-459

Technical Paper / Fusion Energy - Fusion Materials

Dual-beam ion irradiation with Si- or Si and He ions was used to simulate expected fusion conditions. Indentation techniques were used to determine the changes in hardness, modulus and indentation fracture toughness in dual-ion irradiated -SiC at temperatures range from 673 to 1673 K. Ion irradiation clearly enhanced radiation induced hardening. Also, appreciable hardening by simultaneous helium injection revealed after dual-ion irradiation. The elastic modulus of the ion irradiated -SiC exhibited a slight decrease at low temperature irradiation, and a recovery at high temperature irradiated -SiC. The indentation fracture toughness increased after both single- and dual-ion irradiation for dose up to 1-3 dpa, then decreased for higher temperature and longer irradiation.

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