Thermodynamic properties of refractory Mo-Nb-V-Ti high entropy alloys (HEAs)

• Published in: Journal of alloys and compounds 2024-03, Vol.976, p.173279, Article 173279
• Main Authors: Bencze, László, Hasemann, Georg, Sergeev, Dmitry, Motalov, Vladimir, Müller, Michael, Krüger, Manja
• Format: Article
• Language: English
• Subjects: CALPHAD method; High entropy alloys; Knudsen effusion mass spectrometry (KEMS); Phase diagram; Regular solution model; Thermodynamic activity
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.173279

High entropy alloys (HEAs) are solid solution alloys containing at least 5 elements in equiatomic or near-equiatomic composition. In the present study we report on an alloy design route for refractory HEAs based on Mo-Nb-V-xTi alloys (x denotes mole per cent of Ti, x = 5, 10, 15, 20, 25, the mole per cents of Mo, Nb, and V are equal). The thermodynamic activities of Ti and V were determined by Knudsen effusion mass spectrometry and the measured data were compared to the calculated data obtained by CALPHAD method. •We report on an alloy design route for refractory HEAs based on equimolar Mo-Nb-V-xTi alloys (x = 5, 10, 15, 20, 25 mole per cent).•The thermodynamic activities of Ti and V were determined by Knudsen effusion mass spectrometry (KEMS).•The volatile components of Mo-Nb-V-xTi refractory high entropy alloys are Ti and V.•The obtained measured activity coefficient data of Ti are between the corresponding calculated SGTE2020 data for Mo-Ti and Mo-Nb-V-xTi systems but closer to the data for Mo-Ti.•The obtained measured activity coefficient data of V are very close to the calculated SGTE2020 data for Nb-V and rather far from the corresponding SGTE2020 data for Mo-Nb-V-xTi system.