The effect of low-temperature strain on the structure and the critical-current degradation of the superconducting alloy Nb–Ti

Autor:	M. B. Lazareva, O. I. Volchok, N. A. Chernyak, A. V. Mats, Ya. D. Starodubov, O. V. Chernyĭ
Rok vydání:	2005
Předmět:	Superconductivity Materials science Physics and Astronomy (miscellaneous) Annealing (metallurgy) Kinetics Alloy General Physics and Astronomy Titanium alloy Cryogenics engineering.material Martensite engineering Critical current Composite material
Zdroj:	Low Temperature Physics. 31:894-897
ISSN:	1090-6517 1063-777X
DOI:	10.1063/1.2126947
Popis:	The structural-phase aspects of the behavior of the critical current under load in the superconductive alloy Nb–48.5 wt% Ti are studied. It is shown that the optimum preliminary strain at T=77 K with subsequent annealing suppresses the tendency of the β matrix of the alloy to undergo phase transformations according to martensitic kinetics under uniaxial tension at T=4.2 K, and this is manifested in the reduction of the critical-current degradation effect when loaded to σ=0.9σfr in a transverse magnetic field of H=5 T. The paper discusses possible critical-current degradation mechanisms under mechanical loading in the niobium-titanium alloy, based on models of critical current flow in the β matrix reinforced with martensitic interlayers.
Databáze:	OpenAIRE
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