Comptes Rendus
no. 2-3
The trajectory of subboundary grooves during directional solidification of dilute alloys
[La trajectoire des sillons de sous-joints de grains en solidification directionnelle dʼalliages dilués]
Gabriel Faivre1  ; Sabine Bottin-Rousseau1  ; Silvère Akamatsu1
1 Institut des nanosciences de Paris, UPMC, CNRS, 4, place Jussieu, 75252 Paris cedex 05, France
Comptes Rendus. Physique, Volume 14 (2013) no. 2-3, pp. 149-155.

Du fait de leur forte anisotropie capillaire, les sous-joints de grains ne coupent généralement pas les interfaces solide–liquide à angle droit. En conséquence, les sillons de surface des sous-joints se déplacent latéralement en cours de solidification, et ainsi, dans les alliages, entrent en interaction avec les gradients de concentration de soluté créés dans le liquide. Nous discutons les conséquences de cet effet en solidification directionnelle d′échantillons minces à des vitesses de solidification (V) inférieures au seuil d′instabilité cellulaire Vc du système. Nous montrons que la dérive latérale des sillons des sous-joints se ralentit (ou, ce qui revient au même, lʼangle dʼinclinaison des sous-joints par rapport à la direction de croissance diminue) lorsque V augmente et sʼannule lorsque V atteint Vc.

Due to their strong surface energy anisotropy, subboundaries generally do not intersect solid–melt interfaces at right angles. As a consequence, subboundary surface grooves move laterally during solidification, and thereby interact, in alloys, with the solute concentration gradients created in the liquid. We discuss the consequences of this effect during thin directional solidification at speeds (V) lower than the cellular-instability threshold Vc of the system. We show that the lateral drift of the subboundary grooves slows down (or equivalently the tilt angle of the subboundaries relative to the growth direction decreases) as V increases and vanishes as V approaches Vc.

Publié le :
DOI : 10.1016/j.crhy.2013.01.003
Keywords: Solidification, Morphological instability, Grain boundaries, Spatially extended systems
Mot clés : Solidification, Instabilité morphologique, Joints de grains, Systèmes étendus spatialement
Gabriel Faivre 1 ; Sabine Bottin-Rousseau 1 ; Silvère Akamatsu 1

1 Institut des nanosciences de Paris, UPMC, CNRS, 4, place Jussieu, 75252 Paris cedex 05, France 
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Gabriel Faivre; Sabine Bottin-Rousseau; Silvère Akamatsu. The trajectory of subboundary grooves during directional solidification of dilute alloys. Comptes Rendus. Physique, Volume 14 (2013) no. 2-3, pp. 149-155. doi : 10.1016/j.crhy.2013.01.003. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2013.01.003/

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