Metallurgical and Materials Transactions A ( IF 2.8 ) Pub Date : 2020-09-28 , DOI: 10.1007/s11661-020-05995-8 Sumeet Khanna , Shanmukha Kiran Aramanda , Abhik Choudhury
Eutectic solidification gives rise to a wide range of microstructures. A commonly observed morphology is the periodic arrangement of lamellar plates with well-defined orientations of the solid–solid interface in a given eutectic grain. It is typically believed that this form of morphology develops due to the presence of solid–solid interfacial energy anisotropy. In this paper, we provide evidence using phase-field simulations where our focus is on alloys where the minority phase fraction is low. Our aim is to establish the role of solid–solid interfacial energy anisotropy in the stabilization of broken lamellar structures in such systems in contrast to the formation of a rod microstructure. In this regard, we conduct phase-field simulations for different strengths of anisotropy in both constrained and extended settings, using which we clarify the mechanisms by which a lamellar arrangement gets stabilized in the presence of anisotropy in the solid–solid interfacial energy.
中文翻译:
固-固界面能各向异性在共晶体系中破坏层状结构形成中的作用
共晶凝固产生了广泛的微观结构。通常观察到的形态是在给定的共晶晶粒中具有明确定义的固-固界面取向的层状板的周期性排列。通常认为这种形态是由于存在固体-固体界面能各向异性而形成的。在本文中,我们使用相场模拟提供了证据,我们的重点是少数相分数较低的合金。我们的目的是建立与棒状微结构形成对比的固-固界面能各向异性在此类系统中破坏层状结构稳定中的作用。在这方面,我们针对受限和扩展环境下各向异性的不同强度进行了相场模拟,