Internal friction and Young's modulus of Nb/sub 3/Sn between 6 and 300 K
Young's modulus and internal friction were measured in polycrystalline Nb/sub 3/Sn between 6 and 300K. Below the martensitic transformation temperature a large rise in internal friction is observed, in agreement with recent observations. In this temperature range, the internal friction is found to be nearly independent of frequency, a behavior consistent with stress-induced wall motion between domains of the tetragonal phase as the main source of relaxation. Internal friction peaks observed at 140 and 260K in Nb/Nb/sub 3/Sn composite tapes are tentatively attributed respectively to an ..cap alpha.. peak in Nb and hydrogen in the Nb/sub 3/Sn layer. Annealing at 750/sup 0/C for 1/2h is found to decrease the transformation temperature from 49 to 40K, and to modify the softening of Young's modulus in this temperature range. Young's modulus at 6K is 46% of room temperature value and is unchanged by the annealing treatment.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA); Conseil National de Recherches Canada (National Research Council of Canada), Montreal, Quebec. Inst. de Genie des Materiaux
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5584316
- Report Number(s):
- BNL-30667; CONF-810717-2; ON: DE82010622
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
420201 -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
FRICTION
INTERNAL FRICTION
MECHANICAL PROPERTIES
NIOBIUM COMPOUNDS
TEMPERATURE DEPENDENCE
TIN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YOUNG MODULUS