Internal friction and Young's modulus of Nb/sub 3/Sn between 6 and 300 K

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5584316

Faucher, B; Bussiere, J F; Snead, Jr, C L; Suenaga, M

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

Related Subjects

36 MATERIALS SCIENCE
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