中国物理B ›› 2012, Vol. 21 ›› Issue (6): 66801-066801.doi: 10.1088/1674-1056/21/6/066801

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

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

王理林, 王志军, 林鑫, 王猛, 黄卫东   

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2011-06-06 修回日期:2011-12-13 出版日期:2012-05-01 发布日期:2012-05-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 50971102 and 50901061), the National Basic Research Program of China (Grant No. 2011CB610402), the Fund of the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University, China (Grant Nos. 02-TZ-2008 and 36-TP-2009), the Programme of Introducing Talents of Discipline to Universities, China (Grant No. 08040), and the National Science Foundation for Post-doctoral Scientists of China (Grant No. 20110491689).

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

Wang Li-Lin(王理林), Wang Zhi-Jun(王志军), Lin Xin(林鑫)†, Wang Meng(王猛), and Huang Wei-Dong(黄卫东)   

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2011-06-06 Revised:2011-12-13 Online:2012-05-01 Published:2012-05-01
  • Contact: Lin Xin E-mail:xlin@nwpu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 50971102 and 50901061), the National Basic Research Program of China (Grant No. 2011CB610402), the Fund of the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University, China (Grant Nos. 02-TZ-2008 and 36-TP-2009), the Programme of Introducing Talents of Discipline to Universities, China (Grant No. 08040), and the National Science Foundation for Post-doctoral Scientists of China (Grant No. 20110491689).

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摘要： 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.

关键词: solid/liquid interfacial energy, anisotropy, planar interface instability, directional solidification

Abstract: 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.

Key words: solid/liquid interfacial energy, anisotropy, planar interface instability, directional solidification

中图分类号:  (Liquid-solid interface structure: measurements and simulations)

  • 68.08.De
81.30.Fb (Solidification) 47.20.Hw (Morphological instability; phase changes)