Atomic mobility in liquid and fcc Al–Si–Mg–RE (RE = Ce, Sc) alloys and its application to the simulation of solidification processes in RE-containing A357 alloys

Zhao Lu; Ying Tang; Lijun Zhang

doi:10.3139/146.111505

Published by De Gruyter May 30, 2017

Atomic mobility in liquid and fcc Al–Si–Mg–RE (RE = Ce, Sc) alloys and its application to the simulation of solidification processes in RE-containing A357 alloys

Zhao Lu , Ying Tang and Lijun Zhang

From the journal International Journal of Materials Research

https://doi.org/10.3139/146.111505

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Abstract

This paper first provides a critical review of experimental and theoretically-predicted diffusivities in both liquid and fcc Al–Si–Mg–RE (RE = Ce, Sc) alloys as-reported by previous researchers. The modified Sutherland equation is then employed to predict self- and impurity diffusivities in Al–Si–Mg–RE melts. The self-diffusivity of metastable fcc Sc is evaluated via the first-principles computed activation energy and semi-empirical relations. Based on the critically-reviewed and presently evaluated diffusivity information, atomic mobility descriptions for liquid and fcc phases in the Al–Si–Mg–RE systems are established by means of the Diffusion-Controlled TRAnsformation (DICTRA) software package. Comprehensive comparisons show that most of the measured and theoretically-predicted diffusivities can be reasonably reproduced by the present atomic mobility descriptions. The atomic mobility descriptions for liquid and fcc Al–Si–Mg–RE alloys are further validated by comparing the model-predicted differential scanning calorimetry curves for RE-containing A357 alloys during solidification against experimental data. Detailed analysis of the curves and microstructures in RE-free and RE-containing A357 alloys indicates that both Ce and Sc can serve as the grain refiner for A357 alloys, and that the grain refinement efficiency of Sc is much higher.

Keywords: Al–Si–Mg–RE (RE = Ce; Sc) alloys; Diffusion; Atomic mobility; Solidification; A357 alloy

*Correspondence address, Professor Dr. Lijun Zhang, State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, P. R. China, Tel.: +86731 88877963, Fax: +86731 88710855, E-mail: xueyun168@gmail.com, lijun.zhang@csu.edu.cn

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Received: 2017-01-30

Accepted: 2017-03-31

Published Online: 2017-05-30

Published in Print: 2017-06-12

Atomic mobility in liquid and fcc Al–Si–Mg–RE (RE = Ce, Sc) alloys and its application to the simulation of solidification processes in RE-containing A357 alloys

Abstract

References

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