Role of Ti on growth, morphology and microtexture evolution of A15-based V3Ga superconductor by bronze technique

Santra, S and Makineni, S K and Suwas, S and Chattopadhyay, K and Paul, A (2016) Role of Ti on growth, morphology and microtexture evolution of A15-based V3Ga superconductor by bronze technique. In: MATERIALS & DESIGN, 110 . pp. 404-413.

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Abstract

We report a rare experimental evidence of an exceptional increase in grain-boundary diffusion-controlled growth kinetics of product phase by grain-refinement due to minor alloying. Ti-addition during growth of V3Ga superconductor by coupling V and Cu(Ga)-solid solution by bronze process increases the critical current density (J(c)) significantly. In this manuscript, the exact role of Ti-addition is studied based on systematic and quantitative diffusion-couple experiments that mimic the bronze-method. Metallurgical aspects like microstructural features and growth mechanism are assessed critically. Results are compared when Ti is added either to V or Cu(Ga) and to both for a fixed Ga content. Ti-addition to Cu(Ga) compared to V increases growth kinetics of V3Ga more significantly. Quantitative EPMA-analysis indicates that a mixture of Ti-free and Ti-containing V3Ga phase grows when Ti is added to V. Small precipitates grow along with Ti-containing V3Ga when Ti is added only to Cu(Ga). TEM-study indicates that these precipitates are rich in V and Ti. Much finer grains found in the precipitate-containing region lead to higher growth kinetics due to grain-boundary diffusion. EBSD-analysis shows equiaxed grains and relatively random in orientation because of alloying. This study indicates that Ti addition to Cu(Ga) is most effective considering metallurgical aspects that influence J(c). (C) 2016 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	MATERIALS & DESIGN
Additional Information:	Copy right for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	03 Dec 2016 06:35
Last Modified:	03 Dec 2016 06:35
URI:	http://eprints.iisc.ac.in/id/eprint/55301

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