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

D R Liu (1) , Nathalie Mangelinck-Noël (2) , Charles-André Gandin (3) , Gerhard Zimmermann (4) , Laszlo Sturz (4) , Thi-Thuy-My Nguyen (2) , Bernard Billia (2)

1 School of Computer Science & Technology, Harbin University of Science & Technology, 150080, China
2 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
3 CEMEF - Centre de Mise en Forme des Matériaux
4 ACCESS (GERMANY)

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.

Mots clés: CAFE simulations; Columnar to equiaxed transition; Microgravity conditions

Domaines: Matériaux

D R Liu, Nathalie Mangelinck-Noël, Charles-André Gandin, Gerhard Zimmermann, Laszlo Sturz, et al.. CAFE simulation of columnar-to-equiaxed transition in Al-7wt%Si alloys directionally solidified under microgravity. 4th International Conference on Advances in Solidification Processes (ICASP-4), Jul 2014, Old Windsor, United Kingdom. pp.012009, ⟨10.1088/1757-899X/117/1/012009⟩. ⟨hal-01353711⟩