About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Multiscale and Non-Equilibrium Solidification Fundamentals
|
| Presentation Title |
CALPHAD-coupled models of solidification phenomena during metal additive manufacturing |
| Author(s) |
Christopher A. Hareland, Peter W. Voorhees |
| On-Site Speaker (Planned) |
Christopher A. Hareland |
| Abstract Scope |
The rapid cooling rates and large thermal gradients during solidification-based additive manufacturing (AM) lead to solid/liquid interface velocities on the order of centimeters- to meters per second. As such, local interfacial equilibrium is no longer applicable, and rapid solidification theories must be applied. Herein, we discuss a thermodynamically self-consistent framework to describe rapidly solidifying interfaces where energy is dissipated by solute drag. The theory is coupled with CALPHAD methodology to treat arbitrarily complex alloys. At velocities relevant to AM, the theory predicts significant changes in the interfacial compositions and temperatures from those given by equilibrium phase diagrams. Additionally, molecular dynamics simulations can be used to obtain the non-equilibrium kinetic coefficients; in particular, the trans-interface diffusion of solute differs significantly from those in more classical models of rapid solidification. Finally, CALPHAD-coupled applications of this framework to a variety of solidification phenomena observed during metal AM will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Additive Manufacturing, Computational Materials Science & Engineering |