Wang Lei, Yang Laishan
Department of Materials Engineering, The University of British Columbia, 309-6350 Stores Road, V6T 1Z4, Vancouver, British Columbia, Canada.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, China.
Eur Phys J E Soft Matter. 2020 Jul 22;43(7):48. doi: 10.1140/epje/i2020-11972-9.
Dendrites represent the complicated pattern formation in condensed matter physics and microstructures in materials science. Previous work shows that a dendrite can change its orientation due to a change in the anisotropy of solid-liquid interfacial energy. The anisotropy change is often assumed by the increase in the nominal composition. Here, we consider the case where the interfacial anisotropy changes with local composition at the interface rather than the nominal composition and examine its effect on dendritic growth morphology using phase-field simulations. The results are then discussed with respect to 〈110〉 side-arms formation in Al-Mg alloys and physical insights are provided.
枝晶代表了凝聚态物理中的复杂图案形成以及材料科学中的微观结构。先前的研究表明，由于固液界面能各向异性的变化，枝晶可以改变其取向。各向异性变化通常被认为是由名义成分的增加引起的。在这里，我们考虑界面处的界面各向异性随局部成分而非名义成分变化的情况，并使用相场模拟研究其对枝晶生长形态的影响。然后针对铝镁合金中〈110〉侧枝的形成对结果进行了讨论，并提供了物理见解。
