S. Mohagheghi , M. Şerefoğlu , S. Akamatsu , S. Bottin-Rousseau
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引用次数: 0
摘要
我们对二元刻面/非刻面(f/nf)共晶合金中的解耦和耦合生长模式进行了现场实验研究。在透明的氨基甲基丙二醇-琥珀腈(AMPD-SCN)共晶薄样品定向凝固过程中,以较低的生长速度 V (<0.3μms-1)进行了实时光学观测。在大尺度上,两相生长前沿大多表现出不规则间距的解耦生长模式,涉及切面纤维状 AMPD 晶体,这些晶体先于非切面 SCN 固体在液体中突出,并与之发生微弱的扩散作用。低速、稳态解耦生长模式的形态稳定性得到了证明。此外,还发现了三种(f/nf)耦合生长模式,分别具有纤维状、管状(或 "空心")和 C 形形态。研究还为两固态和液体在平衡状态下相遇的三交界处的羽化/下沉动力学提供了新的视角。此外,还讨论了流动性较强或较弱的面的界面动力学与溶质扩散场之间的相互作用,以及具有强各向异性界面的三重连接的稳定性。
Pinning/depinning dynamics of trijunction lines during faceted/nonfaceted eutectic growth
We present an in situ experimental study of decoupled- and coupled-growth patterns in a binary faceted/ nonfaceted (f/nf) eutectic alloy. Real-time optical observation is carried out at low growth velocity () during directional solidification of the transparent AminoMethylPropaneDiol-Succinonitrile (AMPD-SCN) eutectic in thin samples. On a large scale, the two-phase growth front mostly exhibits irregularly spaced decoupled-growth patterns involving faceted fiber-like AMPD crystals that protrude in the liquid ahead of, and in weak diffusive interaction with the nonfaceted SCN solid. The morphological stability of low-velocity, steady-state decoupled-growth patterns is evidenced. In addition, three types of (f/nf) coupled-growth patterns with fiber-like, tubular (or “hollow”) and C-shaped morphologies, respectively, are identified. New light is cast on the pinning/depinning dynamics of trijunctions at which the two solid phases and the liquid meet in equilibrium. A discussion is initiated on the interplay between the interfacial kinetics of the more or less mobile facets and the solute diffusion field, and on the stability of triple junctions with strongly anisotropic interfaces.
期刊介绍:
The journal offers a common reference and publication source for workers engaged in research on the experimental and theoretical aspects of crystal growth and its applications, e.g. in devices. Experimental and theoretical contributions are published in the following fields: theory of nucleation and growth, molecular kinetics and transport phenomena, crystallization in viscous media such as polymers and glasses; crystal growth of metals, minerals, semiconductors, superconductors, magnetics, inorganic, organic and biological substances in bulk or as thin films; molecular beam epitaxy, chemical vapor deposition, growth of III-V and II-VI and other semiconductors; characterization of single crystals by physical and chemical methods; apparatus, instrumentation and techniques for crystal growth, and purification methods; multilayer heterostructures and their characterisation with an emphasis on crystal growth and epitaxial aspects of electronic materials. A special feature of the journal is the periodic inclusion of proceedings of symposia and conferences on relevant aspects of crystal growth.