Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Irradiation-resistant Properties of Structurally Controlled Molybdenum Alloys Through a Multi-step Internal Nitriding

  • Nakahara, Takayuki (Graduate School of Environmental Science and Technology, Okayama University) ;
  • Okamoto, Yoshihisa (Graduate School of Environmental Science and Technology, Okayama University) ;
  • Nagae, Masahiro (Graduate School of Environmental Science and Technology, Okayama University) ;
  • Yoshio, Tetsuo (Graduate School of Environmental Science and Technology, Okayama University) ;
  • Kurishita, Hiroaki (The Oarai Branch, Institute for Materials Research, Tohoku University) ;
  • Takada, Jun (The Graduate School of Engineering, Okayama University) ;
  • Hiraoka, Yutaka (The Graduate School of Engineering, Okayama University) ;
  • Takida, Tomohiro (A.L.M.T. TECH Inc.)
  • Published : 2006.09.24
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Abstract

In order to overcome the recrystallization embrittlement and irradiation embrittlement of Mo, which are major problems for its fusion applications, internally nitrided Mo alloys were prepared by a novel multi-step internal nitriding. Neutron irradiation was performed in the Japan Material Testing Reactor (JMTR). After irradiation, nitrided Mo alloys exhibited $\iota$ ower ductile-brittle transition temperature than irradiated TZM. These results suggested that multi-step internal nitriding was effective to the improvement in the embrittlement by irradiation. Transmission electron microscope observation revealed that TiN particles precipitated by nitriding acted as a sink for irradiation-induced defects.

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