Molten Salt Electrochemical Synthesis, Heat Treatment and Microhardness of Ti–5Ta–2Nb Alloy
- 1 March 2019
- journal article
- conference paper
- Published by Japan Institute of Metals in MATERIALS TRANSACTIONS
- Vol. 60 (3), 391-399
- https://doi.org/10.2320/matertrans.ma201808
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.Keywords
This publication has 40 references indexed in Scilit:
- Preparation of Ta-Nb Alloy Powder by Electro-deoxidation of Ta2O5/Nb2O5 Mixture in a CaCl2-NaCl Eutectic MeltAdvanced Materials Research, 2010
- Phase-Tunable Fabrication of Consolidated (α+β)-TiZr Alloys for Biomedical Applications through Molten Salt Electrolysis of Solid OxidesChemistry of Materials, 2009
- Ti based biomaterials, the ultimate choice for orthopaedic implants – A reviewProgress in Materials Science, 2009
- The electro-deoxidation of porous titanium dioxide precursors in molten calcium chloride under cathodic potential controlElectrochimica Acta, 2009
- Effect of heat treatment on the corrosion behaviour of Ti–5Ta–1.8Nb alloy in boiling concentrated nitric acidJournal of Nuclear Materials, 2008
- Thin Pellets: Fast Electrochemical Preparation of Capacitor Tantalum PowdersChemistry of Materials, 2006
- Electrosynthesis of NbTi and Nb3Sn Superconductors from Oxide Precursors in CaCl2‐Based MeltsAdvanced Functional Materials, 2005
- Determination of the kinetic pathway in the electrochemical reduction of titanium dioxide in molten calcium chlorideElectrochimica Acta, 2005
- High corrosion resistant Ti–5%Ta–1.8%Nb alloy for fuel reprocessing applicationJournal of Nuclear Materials, 2003
- Titanium Alloys for Aerospace ApplicationsAdvanced Engineering Materials, 2003