TY - JOUR
T1 - Phase equilibria and thermodynamic assessment of the Mo–Nb-Re ternary system
AU - Yen, Shao yu
AU - Wu, Shu chang
AU - Makhraja, M. Anshar
AU - Lo, Kai chi
AU - Yeh, An chou
AU - Yoshimi, Kyosuke
AU - Zhang, Chuan
AU - Lin, Shih kang
N1 - Funding Information:
The authors wish to thank the financial supports from the Ministry of Science and Technology (MOST) in Taiwan ( 109-2636-E-006-012 and 106-2628-E-006-002-MY3 ). This work was also partially supported by the Hierarchical Green-Energy Materials (Hi-GEM) Research Center , from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and the Ministry of Science and Technology ( 108-3017-F-006 -003 ) in Taiwan. The authors gratefully thank Dr. Dongwon Shin of the Oak Ridge National Laboratory for useful comments on ternary hcp SQSs. Thanks to Prof. H.-C. Lin and Mr. C.-Y. Kao of Instrumentation Center, National Taiwan University for EPMA experiments.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/9
Y1 - 2020/9
N2 - Refractory elements are usually alloyed in the next-generation superalloys for better high-temperature stability and mechanical properties in the applications ranging from power plants to turbine blades in jet engines. Phase diagrams and thermodynamic models are the essential information for alloy design. Herein, the phase equilibria of the Mo–Nb-Re ternary system was investigated using the complementary methods including ab initio calculations at 0K, high-temperature experiments, and CALPHAD thermodynamic modeling. The ground-state formation enthalpy of the bcc, hcp, σ, and χ phases were determined. The as-cast Mo–Nb-Re alloy and those equilibrated at high temperatures (1973, 2173, and 2373K) were experimentally examined. With the ab initio energetics and high-temperature phase equilibria, the thermodynamic description (functions of Gibbs free energy) of the Mo–Nb-Re ternary system and subsystems was assessed or reassessed, which provides the foundation for further developments of superalloys.
AB - Refractory elements are usually alloyed in the next-generation superalloys for better high-temperature stability and mechanical properties in the applications ranging from power plants to turbine blades in jet engines. Phase diagrams and thermodynamic models are the essential information for alloy design. Herein, the phase equilibria of the Mo–Nb-Re ternary system was investigated using the complementary methods including ab initio calculations at 0K, high-temperature experiments, and CALPHAD thermodynamic modeling. The ground-state formation enthalpy of the bcc, hcp, σ, and χ phases were determined. The as-cast Mo–Nb-Re alloy and those equilibrated at high temperatures (1973, 2173, and 2373K) were experimentally examined. With the ab initio energetics and high-temperature phase equilibria, the thermodynamic description (functions of Gibbs free energy) of the Mo–Nb-Re ternary system and subsystems was assessed or reassessed, which provides the foundation for further developments of superalloys.
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U2 - 10.1016/j.calphad.2020.101797
DO - 10.1016/j.calphad.2020.101797
M3 - Article
AN - SCOPUS:85086887817
VL - 70
JO - Calphad: Computer Coupling of Phase Diagrams and Thermochemistry
JF - Calphad: Computer Coupling of Phase Diagrams and Thermochemistry
SN - 0364-5916
M1 - 101797
ER -