The trajectory of subboundary grooves during directional solidification of dilute alloys

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• 作者：Gabriel Faivre ; ^{gabriel.faivre@insp.jussieu.fr} ; Sabine Bottin-Rousseau ^{sabine.bottin-rousseau@insp.jussieu.fr} ; Silvè ; re Akamatsu ^{silvere.akamatsu@insp.jussieu.fr}
• 关键词：Solidification ; Morphological instability ; Grain boundaries ; Spatially extended systems
• 刊名：Comptes Rendus Physique
• 出版年：2013
• 出版时间：February-March, 2013
• 年：2013
• 卷：14
• 期：2-3
• 页码：149-155
• 全文大小：263 K

文摘

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 .