The effect of interfacial energy anisotropy on planar interface instability in a succinonitrile alloy under a small temperature gradient

• Published in: Chinese physics B Vol. 21; no. 6; pp. 404 - 408
• Main Author: 王理林 王志军 林鑫 王猛 黄卫东
• Format: Journal Article
• Language: English
• Published: 01.06.2012
• Subjects: Anisotropy; Crystallography; Instability; Interface stability; Interfacial energy; Orientation; Stability; Succinonitrile; Temperature gradient; 各向异性平面; 实验装置; 形态稳定性; 模型合金; 温度梯度; 界面不稳定性; 界面稳定性; 界面能量
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/21/6/066801

The morphological stability of a planar interface with different crystallographic orientations is studied under a small positive temperature gradient using a transparent model alloy of succinonitrile. Novel experimental apparatus is constructed to provide a temperature gradient of about 0.37 K/mm. Under this small temperature gradient, the planar interface instability depends largely on the crystallographic orientation. It is shown experimentally that the effect of interfacial energy anisotropy on planar interface stability cannot be neglected even in a small temperature gradient system. Higher interfacial energy anisotropy leads the planar interface to become more unstable, which is different from the stabilizing effect of the interfacial energy on the planar interface. The experimental results are in agreement with previous theoretical calculations and phase field simulations.