The effect of titanium content on the pinning force in Nb44wt%Ti TO Nb62wt%Ti
It has been known for many years that high TiNbTi alloys (e.g. Nb65wt%Ti) have a pinning force that peaks at lower fields than is the case for Nb46.5wt%Ti. The authors have been studying high Ti alloys to establish whether they offer higher low field J/sub c/ values than Nb46.5wt%Ti and find that they do with J/sub c/'s as high as 7500 A mm/sup 2/ at 2T, 4.2/sup 0/K. They have established that the pinning centers are ..cap alpha..-Ti precipitates for all alloys from Nb44wt% Ti to Nb62wt%Ti but nevertheless find a steady shift in the pinning curve peak to lower reduced fields at 4.2 K. Both ..delta..H/sub c/ and ..delta..KAPPA pinning can be recognized in Nb47wt%Ti. Since T/sub c/ and H/sub c/ vary rapidly in the high Ti alloys, ..delta..H/sub c/ pinning should be proportionately stronger in the high Ti alloys, leading to a displacement of the peak in the pinning force curves to lower fields. The authors present pinning force data at 1.8/sup 0/K and 4.2/sup 0/K across the alloy range and find that while lower Ti alloys do exhibit b(1 - b) behavior the higher Ti alloys never realize b/sup 1/2/(1 - b)/sup 2/ behavior.
- Research Organization:
- 9524637
- OSTI ID:
- 6096761
- Report Number(s):
- CONF-880812-
- Journal Information:
- IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. 25:2; ISSN IEMGA
- Country of Publication:
- United States
- Language:
- English
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