Orientation-dependent morphological stability of grain boundary groove

doi:10.1088/1674-1056/23/12/124702

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.

Keywords: morphological instability grain boundaries crystal orientation solidification

Received: 14 April 2014
Revised: 19 May 2014
Accepted manuscript online:

PACS:	47.20.Hw	(Morphological instability; phase changes)
	61.72.Mm	(Grain and twin boundaries)
	81.10.Aj	(Theory and models of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
	81.30.Fb	(Solidification)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 51271213), the National Basic Research Program of China (Grant No. 2011CB610402), China Postdoctoral Science Foundation (Grant No. 2013M542384), and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20116102110016).

Corresponding Authors: Lin Xin
E-mail: xlin@nwpu.edu.cn

Cite this article:

Wang Li-Lin (王理林), Lin Xin (林鑫), Wang Zhi-Jun (王志军), Huang Wei-Dong (黄卫东) Orientation-dependent morphological stability of grain boundary groove 2014 Chin. Phys. B 23 124702


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