ON CATASTROPHIC OXIDATION OF Ti-Zr ALLOYS (in Japanese)
The oxidation behavior of Ti-- Zr alloys (ca. 5 to 90 wt%) was studied using the thermo-balance, x-ray diffraction, electron microscope, and optical microscopic methods. The catastrophic oxidation was observed in alloys containing ca. 50 approximates 90 wt% Zr oxidized in air at 700 or 900 deg C for 30 min or 2 hr. It was verified experimentally that BETA -phases (cubic type crystals) remaining in substrata were more preferentially oxidized than alpha -phases (hexagonal closepacked crystals) in the earliest stage of oxidation (500 deg C, 5 min) of the alloys showing the catastrophic oxidation at 700 or 900 deg C, and moreover, that these alloys showed breakaway phenomena of the surface oxide scales. The studies also clarified by x-ray diffraction and optical microscopic observations that the surfaces were mainly covered with porous TiO/sub 2/ZrO/sub 2/ or TiO/sub 2/ZrO/sub 2/ and ZrO/sub 2/ l ayers in the alloy showing the catastrophic oxidation. (auth)
- Research Organization:
- Waseda Univ., Tokyo
- NSA Number:
- NSA-17-036235
- OSTI ID:
- 4640067
- Journal Information:
- Nippon Kinzoku Gakkaishi (Japan), Journal Name: Nippon Kinzoku Gakkaishi (Japan) Vol. Vol: 27; ISSN NIKGA
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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