| Title： | Quantitative multi-phase-field modeling of non-isothermal solidification in hexagonal multicomponent alloys | |
| Author： | *Yong-biao Wang1, Ming-guang Wei1, **Xin-tian Liu1, Cong Chen1, Jian-xiu Liu1, Yu-juan Wu2, Shuai Dong2, 3, and Li-ming Peng2 | |
| Address： | 1. Henan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment, Zhengzhou University of Light Industry, Zhengzhou 450002, China; 2. National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China; 3. Luoyang Institute of Special Materials Research, Luoyang 471600, Henan, China | |
| Key words： | multi-phase-field model; non-isothermal solidification; polycrystalline; multicomponent alloys; dendrite growth; microstructure | |
| CLC Nmuber： | TP391.9 | |
| Document Code： | A | |
| Article ID： | 672-6421(2022)03-263-12 | |
| Abstract： |
A quantitative multi-phase-field model for non-isothermal and polycrystalline solidification was developed and applied to dilute multicomponent alloys with hexagonal close-packed structures. The effects of Lewis coefficient and undercooling on dendrite growth were investigated systematically. Results show that large Lewis coefficients facilitate the release of the latent heat, which can accelerate the dendrite growth while suppress the dendrite tip radius. The greater the initial undercooling, the stronger the driving force for dendrite growth, the faster the growth rate of dendrites, the higher the solid fraction, and the more serious the solute microsegregation. The simulated dendrite growth dynamics are consistent with predictions from the phenomenological theory but significantly deviate from the classical JMAK theory which neglects the soft collision effect and mutual blocking among dendrites. Finally, taking the Mg-6Gd-2Zn (wt.%) alloy as an example, the simulated dendrite morphology shows good agreement with experimental results.
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