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Meeting

2021 TMS Annual Meeting & Exhibition

Symposium

Computational Thermodynamics and Kinetics

Presentation Title

Kinetic Assessment of HCP Mg-Li-Al Alloys

Author(s)

David W. Christianson, Lilong Zhu, Michele V. Manuel

On-Site Speaker (Planned)

David W. Christianson

Abstract Scope

Mg-Li-Al alloys show great promise for light-weight rigid structures. However, a lack of kinetic descriptions for this system limits the capabilities of computational materials design. This work focuses on the development of a kinetic mobility database for the HCP Mg-Li-Al system using the CALPHAD method. Experimental diffusion analysis was performed using the diffusion couple process. A novel approach was taken to characterize Li diffusion profiles using a combination of Auger electron spectroscopy and inductively coupled plasma optical emission spectroscopy. Al diffusion profiles were acquired using electron probe microanalysis. The forward-simulation method was utilized to extract diffusion coefficients from experimental diffusion profiles. Mobility parameters were then optimized using the Thermo-Calc diffusion module, Diffusion Controlled TRAnsformations (DICTRA). The established mobility database was validated through comparing experimental and simulated diffusion profiles.

Proceedings Inclusion?

Planned:

Keywords

Magnesium, Computational Materials Science & Engineering, ICME

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