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A MICROSTRUCTURAL EVOLUTION MODEL FOR MG17AL12 PRECIPITATES IN AZ91

Junsheng Wang, Mei Li

2026enmagnesiumalloysmodelingnanostructuresmechanical properties

Abstract

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A hybrid phase-field / transmission electron microscopy (TEM) approach has been developed to quantify the evolution of Mg17Al12 precipitates in AZ91 Mg alloys. A three-dimensional phase-field model was adopted to simulate Mg17Al12 nucleation and growth in ternary Mg-Al-Zn alloys. For the nucleation model, we implemented the rate function based on classical nucleation theory. The activation energy and number density of precipitate nuclei were estimated using targeted, quantitative TEM. For the growth kinetics, we modeled the length and thickness increase of the anisotropic Mg17Al12 precipitates using experimentally validated mobility coefficients, first-principles calculated interfacial energies, and chemical free energy and diffusion coefficients from ThermoCalc and Dictra. The model can quantitatively predict Mg17Al12 precipitates size distribution as a function of Al content, aging temperature and time. This model in conjunction with a yield strength model can be used to predict the mechanical properties for future automotive components made of AZ91 Mg alloys.

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Cite This Work

@article{cac62659-45b1-4174-adfc-b1ea7ce0a132,
  title={A MICROSTRUCTURAL EVOLUTION MODEL FOR MG17AL12 PRECIPITATES IN AZ91},
  author={Junsheng Wang and Mei Li},
  year={2026},
  language={en}
}
TY  - JOUR
TI  - A MICROSTRUCTURAL EVOLUTION MODEL FOR MG17AL12 PRECIPITATES IN AZ91
AU  - Junsheng Wang
AU  - Mei Li
PY  - 2026
LA  - en
ER  -

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