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 échantillons minces à des vitesses de solidification (V) inférieures au seuil instabilité cellulaire 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 .
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 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 .
Mot clés : Solidification, Instabilité morphologique, Joints de grains, Systèmes étendus spatialement
Gabriel Faivre 1 ; Sabine Bottin-Rousseau 1 ; Silvère Akamatsu 1
@article{CRPHYS_2013__14_2-3_149_0, 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}, }
TY - JOUR AU - Gabriel Faivre AU - Sabine Bottin-Rousseau AU - Silvère Akamatsu TI - The trajectory of subboundary grooves during directional solidification of dilute alloys JO - Comptes Rendus. Physique PY - 2013 SP - 149 EP - 155 VL - 14 IS - 2-3 PB - Elsevier DO - 10.1016/j.crhy.2013.01.003 LA - en ID - CRPHYS_2013__14_2-3_149_0 ER -
%0 Journal Article %A Gabriel Faivre %A Sabine Bottin-Rousseau %A Silvère Akamatsu %T The trajectory of subboundary grooves during directional solidification of dilute alloys %J Comptes Rendus. Physique %D 2013 %P 149-155 %V 14 %N 2-3 %I Elsevier %R 10.1016/j.crhy.2013.01.003 %G en %F CRPHYS_2013__14_2-3_149_0
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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