ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract A study of the low-field critical current densities (computed from magnetization data) which can be achieved by heat-treating for 1 h Nb-Zr alloys deformed various amounts, has shown that a peak critical current density is always reached after annealing at around 750°C. The magnitude of this peak depends upon the amount of deformation, but is not increased by deforming beyond 80%. Superconducting transition temperatures are also reported. The microstructure was unusual in that deformation was very unevenly distributed and there was little tendency for the dislocations to cross-slip or to form a cellular structure. Precipitation ofΒ Zr occurred in regions of high deformation only, so that equilibrium was not achieved below 80% deformation. The measured superconducting properties are explained in terms of this microstructure, withΒ Zr as the dominant flux pinning agent.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00574931
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