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Online ISSN : 1347-5320
Print ISSN : 1345-9678
Molten Salt Electrochemical Synthesis, Heat Treatment and Microhardness of Ti–5Ta–2Nb Alloy
Jagadeesh SureD. Sri Maha VishnuR. Vasant KumarCarsten Schwandt
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JOURNALS RESTRICTED ACCESS Advance online publication

Article ID: MA201808

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Abstract

Alloy of composition Ti–5Ta–2Nb (numbers in mass%) was synthesised directly from the corresponding mixed metal oxides via the FFC-Cambridge process. Compacted powder discs of TiO2–Ta2O5–Nb2O5 were cathodically polarised against a graphite anode in a molten CaCl2 electrolyte, and the effect of various process parameters on the synthesis of the alloy was investigated. The samples retained their disc-type shape throughout the oxide-to-metal conversion under appropriate processing conditions. XRD analysis showed that the electrochemically prepared alloy existed as single-phase α-Ti and changed into dual-phase (α+β)-Ti upon heat treatment. SEM/EDX analysis revealed a nodular porous microstructure and confirmed the intended chemical composition. Backscattered SEM analysis after heat treatment provided direct evidence of micron-sized β-phase precipitates at the boundaries of the α-phase particles. Microhardness of the heat-treated alloy compared well with literature data for the same material prepared by conventional metallurgical methods. Overall, the study has demonstrated the feasibility of the single-step electrochemical fabrication of Ti–5Ta–2Nb alloy bodies directly from oxides for structural application.

Schematic representation of synthesis of Ti–5Ta–2Nb alloy by electrochemical deoxidation of metal oxide mixtures in a molten salt for measurement of various properties. Fullsize Image
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© 2019 The Japan Institute of Metals and Materials
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