The trajectory of subboundary grooves during directional solidification of dilute alloys

Gabriel Faivre; Sabine Bottin-Rousseau; Silvère Akamatsu

doi:10.1016/j.crhy.2013.01.003

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 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

Comptes Rendus. Physique, Volume 14 (2013) no. 2-3, pp. 149-155.

Résumé
Abstract

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 $V_{c}$ 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 $V_{c}$ .

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 $V_{c}$ 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 $V_{c}$ .

Publié le : 2013-02-01

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

Affiliations des auteurs :

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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     author = {Gabriel Faivre and Sabine Bottin-Rousseau and Silv\`ere Akamatsu},
     title = {The trajectory of subboundary grooves during directional solidification of dilute alloys},
     journal = {Comptes Rendus. Physique},
     pages = {149--155},
     publisher = {Elsevier},
     volume = {14},
     number = {2-3},
     year = {2013},
     doi = {10.1016/j.crhy.2013.01.003},
     language = {en},
}

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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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