About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
2020 Technical Division Student Poster Contest
|
Presentation Title |
SPG-63: Experimental Investigations and Thermodynamic Modeling of the Mo-Nb-Re Ternary System |
Author(s) |
Shao-Yu Yen, Shu-chang Wu, Muhammad Anshar Makhraja, Kai-chi Lo, An-chou Yeh, Kyosuke Yoshimi, Chuan Zhang, Shih-kang Lin |
On-Site Speaker (Planned) |
Shao-Yu Yen |
Abstract Scope |
With ultra-high strength and temperature creep resistance, superalloys are widely used in aerospace and defense industries. In order to increase the operation temperature of turbine engines for higher efficiency, refractory elements with high melting points are usually alloyed in next-generation superalloys. In this work, ab initio aided-CALPHAD was employed for the thermodynamic modelling of Mo-Nb-Re ternary and sub-binary systems. With the ground-state energies obtained from ab initio calculations, experimental difficulties at low to moderate temperatures due to sluggish kinetics can be avoided. Mo-Nb, Nb-Re and Mo-Re were re-assessed successfully and extrapolatable to the ternary system. Due to the lack of experimental data for CALPHAD optimization, high-temperature phase equilibria of the Mo-Nb-Re ternary systems, namely the isothermal sections at 1973 K, 2173 K, and 2373 K, were experimentally determined. With the ab initio energetics and experimentally determined phase equilibria, the thermodynamic description of the Mo-Nb-Re ternary system was assessed and proposed. |
Proceedings Inclusion? |
Undecided |