Description: Multifilamentary composites with constant Nb/bronze ratio were heat treated for a range of reaction times. With increasing reaction time, the size of diffusion (Kirkendall) voids in the bronze matrix increases, as does the Nb/sub 3/Sn layer thickness. Because of the resultant changes in mechanical and superconducting properties, the strain at onset of degradation of critical current density, J/sub c/, decreases with increasing reaction time. Thus there is a compromise between strain sensitivity and current capacity at zero strain as reaction time is increased. For strains on the order of 0.2 to 1.0%, the increased strain sensitivity of J/sub c/ in specimens which were reacted for longer than approximately 24 hrs offsets the gain in J/sub c/ resulting from increased Nb/sub 3/Sn layer thickness. The diffusion voids are also related to thermal instabilities and crack initiation.
Date: January 1, 1978
Creator: Easton, D.S. & Kroeger, D.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department