Metallurgical processing, structure and superconducting transition temperature of V3Ga
Identifieur interne : 000D30 ( Main/Exploration ); précédent : 000D29; suivant : 000D31Metallurgical processing, structure and superconducting transition temperature of V3Ga
Auteurs : B. N. Das [États-Unis] ; J. E. Cox [États-Unis] ; R. W. Huber ; R. A. Meussner [États-Unis]Source :
- Metallurgical Transactions A [ 0360-2133 ] ; 1977-04-01.
Abstract
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.
Url:
DOI: 10.1007/BF02676975
Affiliations:
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N." last="Das">B. N. Das</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><placeName><region type="state">District de Columbia</region></placeName><wicri:cityArea>Material Sciences Division, Naval Research Laboratory, 20375, Washington</wicri:cityArea></affiliation></author><author><name sortKey="Cox, J E" sort="Cox, J E" uniqKey="Cox J" first="J. E." last="Cox">J. E. Cox</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><placeName><region type="state">District de Columbia</region></placeName><wicri:cityArea>Material Sciences Division, Naval Research Laboratory, 20375, Washington</wicri:cityArea></affiliation></author><author><name sortKey="Huber, R W" sort="Huber, R W" uniqKey="Huber R" first="R. W." last="Huber">R. W. Huber</name></author><author><name sortKey="Meussner, R A" sort="Meussner, R A" uniqKey="Meussner R" first="R. A." last="Meussner">R. A. 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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.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>District de Columbia</li></region></list><tree><noCountry><name sortKey="Huber, R W" sort="Huber, R W" uniqKey="Huber R" first="R. W." last="Huber">R. W. Huber</name></noCountry><country name="États-Unis"><region name="District de Columbia"><name sortKey="Das, B N" sort="Das, B N" uniqKey="Das B" first="B. N." last="Das">B. N. Das</name></region><name sortKey="Cox, J E" sort="Cox, J E" uniqKey="Cox J" first="J. E." last="Cox">J. E. Cox</name><name sortKey="Meussner, R A" sort="Meussner, R A" uniqKey="Meussner R" first="R. A." last="Meussner">R. A. Meussner</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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