EFFECT OF ALUMINUM, TIN AND MOLYBDENUM ON THE HOT-HARDNESS OF ZIRCONIUM (in Japanese)
In order to improve the strength of zirconium at elevated temperatures, the binary alloys of zirconium with aluminum, tin, and molybdenum were melted in nonconsumable argon arc furnace, and their hot hardness investigated. The results obtained are summarized as follows: (1) About 3% of tin or 4% of molybdenum, at least, has to be added to zirconium in order to improve the strength of zirconium it elevated temperature. On the other hand, addition of 2% of aluminum hardens zirconium more thjn any of the above elements. Generally, below 400 deg C, molybdenum is the most effective among the three in hardening zirconium, but above 600 deg C, aluminum is the most effective. (2) By quenching from the alpha range, the alloys are hardened less than by slow cooling them from the same temperature. On the contrary, by quenching from the BETA range, they are hardened more. (3) The hot hardness of alloys which are slow cooled decreases with increasing temperature, but there is an abnormal hardening range between 300 and 400 deg C in the Zr-Mo alloys when quenched from 900 deg . A similar phenomenon is also found in the case of tempered Zr--Mo alloys after quenching at the same condition, that is, the hardness rises to the maximum at about 400 deg C. It seems that these phenomena are related with the precipitation of the w in BETA phase reported by H. A. Robinson et al. (auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-13-017033
- OSTI ID:
- 4227449
- Journal Information:
- Nippon Kinzoku Gakkaishi (Japan), Journal Name: Nippon Kinzoku Gakkaishi (Japan) Vol. Vol: 22; ISSN NIKGA
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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