Extension of high temperature life time of low activation vanadium alloys by nano-particle control

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For the purpose of enhancing high temperature strength and upper operation temperature limit of low activation vanadium alloys, which are promising candidate of fusion structural materials, production of V-4Cr-4Ti alloys containing high density precipitates and high density nano-particles was performed by repeated thermo-mechanical treatments and mechanical alloying, respectively. Mechanical property evaluation including thermal creep tests verified the increased high temperature strength by the precipitates or nano-particles, and the underlying mechanisms were clarified.