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Using CALPHAD-based Tools for the Study and Design of High Entropy Alloys

Jun 10, 2021 12:00pm ‐ Jun 10, 2021 1:00pm



The discovery and design of new High Entropy Alloys (HEAs) presents a challenge due to the scale and complexity of the potential combinatorial space. Modeling HEAs using the well established CALPHAD approach presents unique challenges compared with other alloy systems due to the lack of a single principle element. In this webinar, we describe the approach taken in developing the TCHEA thermodynamic database, which contains 26 elements, where almost all underlying binary and over 400 Ternary systems have been critically evaluated to capture the composition and temperature dependence, and also the corresponding MOBHEA mobility database.

Examples will be given of calculations successfully performed in the interpretation of experimental observations and design of new HEAs, for instance, to predict the phase stability and solid solubility of BCC and FCC, to understand the microstructure evolution, to estimate the density of alloys, to interpret the deformation mechanism associated with the stacking fault energy based on the estimation of energy difference between HCP and FCC , to investigate the oxidation behavior, and to design cemented carbide cutting tools using HEA as the binder phase.

An interactive Q&A session will follow the presentation.

Calculated phase diagram for CoCrFeNi-Alx

Calculated phase diagram for CoCrFeNi-Alx

Presented by Thermo-Calc Software

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