Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 99, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2021.105595
Keywords
TiMoVWCr; TiMoVNbZr; Bio-RHEA; Vacuum arc remelting; FE-EPMA; Electrochemical properties
Funding
- Basic Science Research Program of the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2018R1D1A1B07041526]
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This study investigated the thermodynamic parameters, microstructures, and electrochemical properties of TiMoVWCr and TiMoVNbZr bio-refractory high-entropy alloys prepared using the vacuum arc remelting process. The results showed that these bio-RHEAs have good thermodynamic parameters and phase stability.
This study investigated the thermodynamic parameters, microstructures and electrochemical properties of TiMoVWCr and TiMoVNbZr bio-refractory high-entropy alloys (bio-RHEAs) prepared using the vacuum arc remelting process. The alloys were characterized using field emission scanning electron microscopy, field emission electron probe microanalyzer, X-ray diffraction analysis, and potentiodynamic polarization tests. The determined thermodynamic values of dl-parameter, atomic size difference and valence electron concentration for the TiMoVWCr and TiMoVNbZr bio-RHEAs were within the range of solid solution formation. A hightemperature stable single BCC1 phase was obtained using the thermodynamic equilibrium calculations for the TiMoVWCr and TiMoVNbZr systems. The TiMoVWCr alloy microstructure comprised a dendrite, an interdendrite, and a second phase, while TiMoVNbZr alloy comprised a dendrite and an inter-dendrite. The TiMoVWCr alloy forming the stable single body-centered cubic solid solution demonstrated homogeneous microstructure and high phase stability. Moreover, pitting resistances of TiMoVWCr and TiMoVNbZr bio-RHEAs were remarkably superior to that of ASTM F75 alloy.
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