CAFE simulation of columnar-to-equiaxed transition in Al-7wt%Si alloys directionally solidified under microgravity

4th International Conference on Advances in Solidification Processes

材料科学;物理学

Liu, D.R.^1 ; Mangelinck-Noël, N.^2,3 ; Gandin, Ch-A^4 ; Zimmermann, G.^5 ; Sturz, L.^5 ; Thi, H Nguyen^2,3 ; Billia, B.^2,3

School of Materials Science and Engineering', Harbin University of Science and Technology, No. 4 Lin Yuan Road, Xiang Fang District, Harbin

150040, China^1

Aix-Marseille University, France^2

CNRS, IM2NP, UMR CNRS 7334, Campus Saint-Jérôme, Case 142, Marseille Cedex 20

13397, France^3

MINES ParisTech, CEMEF, CNRS UMR 7635, Sophia Antipolis, France^4

ACCESS E.V., Aachen, Germany^5

关键词: Columnar to equiaxed transition;    Directionally solidified;    Equivalent diameter;    Grain elongation;    Micro-segregation;    Quantitative agreement;    Structure evolution;    Transition modes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/117/1/012009/pdf
DOI  :  10.1088/1757-899X/117/1/012009

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A two-dimensional multi-scale cellular automaton - finite element (CAFE) model is used to simulate grain structure evolution and microsegregation formation during solidification of refined Al-7wt%Si alloys under microgravity. The CAFE simulations are first qualitatively compared with the benchmark experimental data under microgravity. Qualitative agreement is obtained for the position of columnar to equiaxed transition (CET) and the CET transition mode (sharp or progressive). Further comparisons of the distributions of grain elongation factor and equivalent diameter are conducted and reveal a fair quantitative agreement.