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Metallurgical processing, structure and superconducting transition temperature of V3Ga

  • Alloy Phases and Structure
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Abstract

Alloy compositions, spanning the A15 phase field and the adjacent two phase fields, were arc melted and cast as rods for the study of metallurgical processing, resultant microstructures and superconductivity of V3Ga. In cast materials, dendritic segregation was observed by metallographic examination and a radial Ga gradient was revealed by inductive super conducting transition temperature measurement. A brief heat treatment at temperatures in the bcc-phase field eliminated the dendritic segregation, decreased the radial Ga gradient, and produced very similar microstructures in the full range of compositions. The fine scale segregation generated in the bcc-to-A15 transformation was removed by an anneal at 1000 to 1150°C. The series of annealed specimens were uniform in microstructure and also in hardness. The lattice parameter-composition plot defined two lines intersecting near the stoichiometric composition. These data and density measurements show that the compositional adjustment is by substitution of V and Ga atoms on lattice sites. The superconducting transition temperature drops rapidly from a maximum as the composition deviates from stoichiometry. Measured values of the zero field transition temperature are somewhat higher than theT o determined by extrapolating low fieldT c measurements to zero field.

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Authors and Affiliations

  1. Material Sciences Division, Naval Research Laboratory, 20375, Washington, DC

    B. N. Das, J. E. Cox & R. A. Meussner

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  1. B. N. Das
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  2. J. E. Cox
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  3. R. W. Huber
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  4. R. A. Meussner
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R. W. HUBER, presently retired was with Electronics Technology Division, Naval Research Laboratory, Washington, DC 20375

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Das, B.N., Cox, J.E., Huber, R.W. et al. Metallurgical processing, structure and superconducting transition temperature of V3Ga. Metall Trans A 8, 541–552 (1977). https://doi.org/10.1007/BF02676975

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  • DOI: https://doi.org/10.1007/BF02676975

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