| 摘要 |
PURPOSE:To provide excellent nodular corrosion resistance and to prevent hydrogen embrittleness by incorporating a specific ratio of Nb and Zr into Hf and precipitating a martensite crystal in the alloy texture. CONSTITUTION:At least one kind of 0.01-14.8wt% Nb and >=0.01wt% Zr are incorporated into Hf and the total amt. of these added alloy elements is made <=40wt%. The Hf alloy is quickly cooled from the beta region or alpha+beta region to precipitate the martensite crystal structure in the alloy structure. After the precipitation of the martensite crystal structure, the alloy is annealed at about 800 deg.C and is quench hardened, by which strain is relieved therefrom. The alloy having excellent strength and a remarkable effect as a control rod for a nuclear reactor is thus obtd.
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