ISSN:
1432-0630
Keywords:
74
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract Variation of theT c as a function of composition for the C15 materials of the systems Hf−V and Zr−V was investigated. Samples in the as cast and annealed conditions were examined by x-ray and optical metallography. None of the samples was found to be of single phase. For the Hf−V system,T c increases to a constant value of about 9 K for the compositions between 36 and 60 at. %V. A slight increase ofT c between 60 and 70 at. %V and a degradation inT c above 80 at. %V were observed. As cast materials show the maximumT c value of 9.4 K. Deviations from stoichiometry and heat treatments produce considerable changes in the microstructures but have little effect onT c . A slight enhancement ofT c for the alloy containing 80 at. %V is explained by the pressure on V2Hf due to V phase by the differential thermal contraction. For the Zr−V system, maximumT c value of 8–6 K was observed for alloys having 20–66 at. %V in as cast condition. Heat treatments cause the lowering ofT c . Results indicate that the preparation of ZrV2 superconducting material will need more careful control than would be necessary for HfV2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00885250
