THE CREEP AND HIGH-TEMPERATURE FATIGUE PROPERTIES OF THE MAGNESIUM-BASE CANNING ALLOY, MAGNOX A.12
A study was made of the creep ductility and high-temperature fatigue behavior of the raagnesium-base alloy Magnox A.12, currently used as the canning material in the Calder Hall and Chapelcross reactors. Particular attention was given to creep behavior in the lower range of reactor temperatures where this alloy exhibits its minimum ductility and where intergranular cavitation is most prevalent. The effects of temperature, strain rate, and grain size on both ductility and cavitation were investigated. In view of the lack of data on the high-temperature fatigue strength of this alloy, a preliminary survey was made over the range 225 to 500 deg C. Detailed studies were carried out at 400 and 450 deg C where the fatigue strength attained its lowest value. With the exception of very short-term tests in which general cracking occurred, fatigue failure was attributable to the development of intergranular cavities and their subsequent interlinking. The effect of initial grain size and grain growth during test was studied at 400 to 500 deg C. lt is shown that grain coarsening gives rise to increased fatigue strength at these temperatures. (auth)
- Research Organization:
- United Kingdom Atomic Energy Authority, Culcheth, Lancs, Eng.
- NSA Number:
- NSA-14-025974
- OSTI ID:
- 4131823
- Journal Information:
- J. Inst. Metals, Vol. Vol: 88; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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