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Journal Articles

Local modification of hardness in FeCu alloys by using swift heavy ion irradiation

Nakagawa, Sho*; Hori, Fuminobu*; Chimi, Yasuhiro; Ishikawa, Norito; Kitagawa, Michiharu*; Oshima, Ryuichiro*; Tobita, Toru; Taniguchi, Ryoichi*; Suzuki, Masahide; Iwase, Akihiro*

Nuclear Instruments and Methods in Physics Research B, 257(1-2), p.397 - 401, 2007/04

 Times Cited Count:4 Percentile:36.5(Instruments & Instrumentation)

Supersaturated Fe-1.2wt.%Cu alloys were irradiated with 200-MeV Xe and 200-MeV Au ions at elevated temperatures. To make an irradiated region and an unirradiated region in a specimen, a masking plate was put on the specimen during the irradiation. After the irradiation, the hardness was measured by using a conventional microhardness tester or a nano-indenter. We have found that the hardness only in irradiated region increases by the irradiation. The boundary of irradiated and unirradiated regions can be clearly identified by the difference in hardness. The present result implies that swift heavy ion irradiation can be used for the local modification of hardness in supersaturated alloys.

Oral presentation

Cu atom clustering and changes in electrical conductivity and hardness in FeCu alloys irradiated with high-energy particles

Ishikawa, Norito; Okamoto, Yoshihiro; Hirao, Norie*; Nakagawa, Sho*; Iwase, Akihiro*; Hori, Fuminobu*; Ono, Hirotaka*; Kitagawa, Michiharu*; Oshima, Ryuichiro*

no journal, , 

In reactor pressure vessel, hardening due to irradiation is partly originated from Cu precipitation promoted by irradiation. In this study, development of evaluation methodology for embrittlement phenominon is the main objective, and it has been found that hardness change due to irradiation correlates well with accompanied electrical resistivity change.

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