| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Entropy Alloys IX: Structures and Modeling
|
| Presentation Title |
Phase Stability of NbVZrMx (M = Ti, Mo; x = 0 – 1) Refractory Complex Concentrated Alloys |
| Author(s) |
Zhaohan Zhang, Mu Li, Guodong Ren, Arashdeep Thind, Katharine Flores, Rohan Mishra |
| On-Site Speaker (Planned) |
Zhaohan Zhang |
| Abstract Scope |
Identifying dominant factors that lead to the stabilization of single-phase solid solutions, as opposed to multi-phases involving intermetallics, in complex concentrated alloys is a fundamental issue that remains unclear. In this work, we employ NbVZrTix and NbVZrMox as model systems to investigate the role of chemical composition on the phase-stability of refractory complex concentrated alloys and develop descriptors that govern their microstructure. We use a laser processing method to fabricate composition libraries of NbVZrMx (0<= x <=1). While the base alloy NbVZr exhibits a mixture of BCC solid solution with two Laves intermetallic phases, upon alloying with the fourth element, we observe suppression of the intermetallic phases and stabilization of BCC solid solutions in certain quaternary compositions. We will present results of first-principles density-functional-theory(DFT) calculations of various factors, including entropy, lattice distortions, electronic structure changes, and present key descriptors that govern the microstructure evolution, and consequently the mechanical properties. |
| Proceedings Inclusion? |
Planned: TMS Journal: Metallurgical and Materials Transactions |