固液界面通常为规则界面, 但有时为不规则界面,如倾斜枝晶、退化枝晶和海藻状晶体界面.以琥珀腈为研究对象,用设计的定向凝固实验体系, 研究了不同温度梯度和界面生长速度对固液界面形貌的影响.实验结果表明:界面生长速度一定时,增加温度梯度界面由倾斜枝晶逐渐转变为退化枝晶,最终成为海藻状晶体;温度梯度一定时,降低界面生长速度界面会发生类似的变化.温度梯度和界面生长条件在一定范围内变化时,界面可以从一种生长方式变为另一种方式,如可以从海藻状晶体连续地变为倾斜枝晶.在某些条件下,海藻状晶体和倾斜枝晶可能同时出现在界面上,并竞相生长.退化枝晶界面处于动态变化中,二次枝晶臂不断地改变着生长方向.
参考文献
| [1] | Coriell S R;Sekerka R F .The Effect of the Anisotropy of Surface Tension and Interface Kinetics on Morphological Stability[J].Journal of Crystal Growth,1976,34:157-163. |
| [2] | Billa B;Trivedi R.Pattern Fromation in Crystal Growth[A].,1993 |
| [3] | Ben-Jacob Eshel;Garik Peter .Ordered Shapes in Nonequilibrium Growth[J].Physical Review D,1989,38:16-28. |
| [4] | Utter B.;Bodenschatz E. .Dynamics of low anisotropy morphologies in directional solidification - art. no. 051604[J].Physical review.E.Statistical physics, plasmas, fluids, and related interdisciplinary topics,2002(5):1604-0. |
| [5] | Akamatsu Silvere;Faivre Gabriel;Ihle Thomas .Symmetry-broken Double Fingers and Seaweed Patterns in Thin-film Directional Solidification[J].Physical Review E,1995,51:4751-4773. |
| [6] | Akamatsu Silvere;Ihle Thomas .Similarity Law of the Tilt Angle of Dendrites in Directional Solidification of Non-axially-oriented Crystals[J].Physical Review E,1997,56:4479-4485. |
| [7] | Utter B.;Bodenschatz E.;Ragnarsson R. .Alternating tip splitting in directional solidification[J].Physical review letters,2001(20):4604-4607. |
| [8] | Ben-Jacob E;Deutscher G;Garik P et al.Formation of a Dense Branching Morphology in Interfacial Growth[J].Physical Review Letters,1986,57:1903-1906. |
| [9] | ARNEODO A;Couder Y;Grasseau G;Hakim V, Rabaud M .Uncovering the Analytical Staffman-Tylor Finger in Unstable Viscous Fingering and Diffusion-Limited Aggregation[J].Physical Review Letters,1989,63:984-987. |
| [10] | Sawada Yasuji;Dougherty A;Gollub J P .Dendritic and Fractal Patterns in Electrolytic Metal Deposits[J].Physical Review Letters,1986,56:1260-1263. |
| [11] | Heslot F Libchaber A .Unidirectional Crystal Growth and Crystal Anisotropy[J].Physical Scripta,1985,T9:126-129. |
| [12] | Brener E;Muller-krumbhaar H;Temkin D .Kinetic Phase Diagram and Scaling Relations for Stationary Diffusional Growth[J].Europhysics Letters,1992,17(06):535-540. |
| [13] | Ihle T;Muller-Krumbhaar H .Fractal and Compact Growth Morphologies in Phase Transitions with Diffusion Transport[J].Physical Review E,1993,49:2972-2991. |
| [14] | Sherwood John N.The Plastically Crystalline State (Orientationally-Disordered Crystals)[M].John Wiley and Sons Inc,1979 |
| [15] | LI Li .An Experimental System for Interface Morphology Study during Unidirectional Solidification[D].Akron: Master Thesis, The Vniversity of Akron, American,1999. |
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