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A MECHANISM DESCRIBING EFFECTS OF GRAIN-BOUNDARY INTERNAL FRICTION AND SMALL AMOUNTS OF INTERSTITIAL IMPURITIES ON GRAIN-BOUNDARY BRITTLENESS IN MOLYBDENUM,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
The grain boundary peak in molybdenum was measured by a torsion pendenlum, when the frequency of vibration is 1 cps, the peak occurs around 1020 degrees C. This G. B. peak is reduced by oxygen or carbon additions, but an alloy grain boundary peak appears at the lower temperatures on the same damping curve. Using frequency of 1 cps, Oxygen peak occurs around 890 degrees C and carbon peak occurs around 925 degrees C. Since no peak is evident on the damping vs temperature curve of molybdenum single crystals, it may be concluded that these peaks are all associated with the stress relaxation across grain boundaries. Author
APPROVED FOR PUBLIC RELEASE