Orientation-dependent morphological stability of grain boundary groove

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Article number124702
Journal / PublicationChinese Physics B
Volume23
Issue number12
Publication statusPublished - 1 Dec 2014
Externally publishedYes

Abstract

Crystal orientation influences the morphological stability of solid-liquid interface during directional solidification of alloy, resulting in the variation of solidified microstructure. In this paper, the morphological evolution near grain boundary grooves (GBGs) with different crystal orientations in a dilute succinonitrile alloy under low temperature gradient and interface velocity is observed in situ. Under experimental conditions, the macroscopic solid-liquid interface is planar and keeps stable, while in GBGs there emerge protrusion and undulation. It is found that the morphological stability of GBG is dependent on crystal orientation. Specifically, for succinonitrile with a body-centered cubic crystal structure, GBGs around the 〈100〉 crystal orientation keep stable, while those apart from the 〈100〉 crystal orientation become unstable under the same conditions. So it is concluded that 〈100〉 crystal orientation favors the morphological stability of GBG.

Research Area(s)

  • Crystal orientation, Grain boundaries, Morphological instability, Solidification

Bibliographic Note

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Citation Format(s)

Orientation-dependent morphological stability of grain boundary groove. / Wang, Li-Lin; Lin, Xin; Wang, Zhi-Jun et al.
In: Chinese Physics B, Vol. 23, No. 12, 124702, 01.12.2014.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review