Fundamental experiments on the internal oxidation process of vanadium alloys were performed for the purpose of improving the high temperature strength of vanadium alloys. The following results were obtained:
(1) Zirconium and silicon were alloyed to vanadium, respectively, as internally oxidizing elements. Zirconium was found to be more favorable than silicon because of the superior high-temperature strength of the internally oxidized V-Zr alloy.
(2) An excess of oxygen, supplied by decomposition of NiO, increased the amount of oxygen dissolved in solid-solution in the internally oxidized alloy, which caused strengthening of the alloys not at high temperature but at low temperature, accompanied by embrittlement.
(Received August 31, 1979)
*This paper was originally published in Japanese in J. Japan Inst. Metals, 41 (1977), 1033.
**Graduate School, Tohoku University, Sendai, Japan. Currently, Central Research Institute of Electric Power Industry, Department of Atomic Energy, Komae-shi, Tokyo 182, Japan.
***Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai 980, Japan.
© 2002 The Japan Institute of Metals
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