Finite diffusion microsegregation model applied to multicomponent alloys

[摘要] During casting, diffusion phenomena are often simplified by Lever-Rule or GulliverScheil hypotheses, thus simplifying chemical diffusion to extreme configurations. The present work proposes an extension of the Tong-Beckermann microsegregation model to multi-component alloys while considering finite diffusion in liquid and solid phases plus the effect of tip undercooling of the columnar front. The behaviour of this model is studied according the solidification conditions (growth velocity and thermal gradient) and comparison with microprobe measurements is proposed for a seven components nickel-base superalloy.

[发布机构] MINES ParisTech, PSL Research University, CEMEF - Centre de Mise en Forme des Matériaux, CNRS UMR 7635, CS 10207, 1 rue Clause Daunesse, Sophia Antipolis Cedex; F-06904, France^1;Safran, Site de Paris-Gennevilliers, 171 Boulevard de Valmy, Colombes; F-92700, France^2;Université de Lorraine, Institut Jean Lamour, CNRS UMR 7195, Nancy; F-54011, France^3

[效力级别] 计算机科学

[关键词] Chemical diffusion;Diffusion phenomena;Growth velocity;Micro-segregation;Microprobe measurements;Multi-component alloy;Nickel base superalloy;Solidification condition