SOME STUDIES ON METALLURGICAL BEHAVIOR OF MAGNOX ALLOY. II. PHENOMENA OF CAVITATION AND CRACKING DURING CREEP (in Japanese)
Creep tests were carried out on Magnox, Mg-1% Al, and Mg-1% Zr alloys at several temperatures in the range from 300 to 500 deg C under several stresses in the range irom 0.15 to 0.38 kg/mm/. After the creep test, specimens were cut out to investigate the phenomenon of cavitation in these alloys during creep test. Average creep rates of Magnox alloys under these conditions are the order of 10/ sup -3/ approximates 10/sup -1/%/ hr Magnox A12, possesses higher creep strength than racture at the temperature of 400 deg C or above and brittle fracture at the temperature of 300 deg C or below. The surface of the specimen becomes rough by creep deformation. Cavities are formed preferentially in grain boundaries normal to the stress axis at early stage of secondary creep mainly caused by grain boundary sliding. ln the case of higher stress, cavities and cracks are mainly created at triple points of grain boundaries. At constant temperature, for a given amount of strain, the number of cavities increases with decreasing strain rate, and for a given strain rate it mncreases with total amount of strain. Cavities are formed easily at the temperature range from 300 to 400 deg C, and they are not formed at the temperature of 500 deg C and above. (auth)
- Research Organization:
- Japan Atomic Energy Research Inst., Tokyo
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-16-002231
- OSTI ID:
- 4818593
- Journal Information:
- J. At. Energy Soc. Japan, Journal Name: J. At. Energy Soc. Japan Vol. Vol: 3
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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