亚稳的液体阶段分离发生在第三的 Cu 50 Fe 37.5 公司 12.5 包晶体的合金微滴在免费秋天期间。分开的合金很快融化团结并且发展由 L 1(Cu) 和 L 2(Fe,Co) 阶段组成的核心壳微观结构。基于阶段转变温度,核心壳微观结构进化,界面的精力,温度坡度和 Marangoni 迁居的决心被分析。分开的液体阶段的界面的精力与温度的减少增加。温度坡度变化从对大沿着到在合金微滴的外面的来自里面的半径方向小。Marangoni 力量(F M ) 对起作用有有增加的 L 2(Fe,Co) 阶段,和减少的尺寸的增加的 L 2(Fe,Co) 阶段增加微微滴在冷却下面。由 F M ,2(Fe,Co) 阶段在合金微滴从外面移植到里面,碰撞并且在移植期间使对方凝结,然后形成核心壳微观结构的不同类型的 L 微微滴。
The metastable liquid phase separation occurs in the ternary Cu50Fe37.5Co12.5 peritectic alloy droplets during free fall. The separated alloy melt rapidly solidifies and evolves core-shell microstructure composed of LI(CU) and L2(Fe,Co) phases. Based on the determination of the phase transition temperature, the core-shell microstructure evolution, the interfacial energy, the temperature gradient and the Marangoni migration are analyzed. The interfacial energy of the separated liquid phase increases with the decrease of the temperature. The temperature gradient changes from large to small along the radius direction from inside to outside in the alloy droplet. The Marangoni force (FM) acting on the microdroplet of L2(Fe,Co) phase increases with the increase of the size of the L2(Fe,Co) phase, and decreases with the increase of undercooling. Driven by FM, the micro-droplet of L2(Fe,Co) phase migrates from outside to inside in the alloy droplet, collides and coagulates each other during migration, and then forms different types of core-shell microstructures.