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(FTP/36) Development of V-Ti-Cr-Si Type Low-Activation Vanadium Alloys for Fusion Structural Material

M. Satou¹, K. Abe¹, A. Hasegawa¹, H. Kayano², T. Shibayama³, H. Matsui⁴

¹ Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579 JAPAN
² Emeritus professor, Tohoku University, Sendai 980-8577 JAPAN
³ Center for Advanced Research of Energy Technology, Hokkaido University, Sapporo 060-8628 JAPAN
⁴Institute for Materials Research, Tohoku University, Sendai 980-8577 JAPAN

Abstract.  Development of V-Ti-Cr type alloy containing Si, Al and Y was described including material preparation, baseline properties, irradiation performance and coating with ceramics. The loss of elongation, which may restrict lower temperature limit of the design windows for vanadium alloy, had correlation with the concentration of interstitial impurities, especially oxygen. Therefore, purification of the alloy is one of the ways to keep the uniform elongation. Since the addition of Al and Y made the oxygen concentration in solution low, modification by the addition of Si, Al and Y is the promising way for development of vanadium alloy for fusion structural material.

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