About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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High Entropy Alloys VIII
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Presentation Title |
J-79: CALPHAD Aided Design of MoNbTiZr-based High Entropy Alloys |
Author(s) |
Benjamin E. MacDonald, Cheng Zhang, Zhiqiang Fu, Fengwei Guo, Yongwang Kang, Xiaochang Xie, Yizhang Zhou, Enrique J. Lavernia |
On-Site Speaker (Planned) |
Benjamin E. MacDonald |
Abstract Scope |
CALPHAD calculations using the current high entropy database developed by ThermoCalc are first utilized to search compositional space for candidate alloy compositions that exhibit beneficial equilibrium phases for high temperature stability and properties. In addition to the base constituents MoNbTiZr, other alloying elements, including Al, are screened for increases to the stability of multiple body centered cubic solid solutions while avoiding the stabilization of phases deleterious to mechanical properties, particularly laves phases. To evaluate the CALPHAD predictions, candidate alloy compositions are synthesized via arc melting for microstructural characterization. As-cast and heat treated multi-phase microstructures are characterized through x-ray diffraction, energy dispersive spectroscopy, and high resolution transmission electron microscopy to identify present phases. To understand the strengthening role of each phase in these alloys, the mechanical behavior of the alloys is assessed in terms of tensile tests at room temperature and at elevated temperatures. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |