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三元Cu_(60)Fe_(30)Co_(10)包晶合金的亚稳液相分离与快速凝固 被引量:13

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摘要 利用落管技术和DSC热分析方法,研究了三元Cu60Fe30Co10包晶合金的亚稳液相分离现象和快速凝固过程.发现该合金在1623.5K发生亚稳液相分离,形成了两个液相分别凝固为fcc结构的Cu(Fe,Co)固溶体和bcc结构的Fe(Cu,Co)固溶体.落管中快速凝固条件下,合金过冷度和冷却速率均随液滴直径的减小而增大.一定的过冷度水平是发生亚稳液相分离的必要条件,同时冷速大小直接影响凝固组织演变.随着冷速增大,Fe(Cu,Co)相逐渐细化,弥散分布于Cu(Fe,Co)相基体中.计算分析了Fe(Cu,Co)小液滴在Cu(Fe,Co)液相基体中的Stokes运动和Marangoni迁移,发现在落管中微重力条件下Marangoni迁移速率明显高于Stokes运动速率,Fe(Cu,Co)小液滴的运动主要由Marangoni迁移支配.在同一过冷度下,VM/VS随Fe(Cu,Co)小液滴直径的减小而增大.对相同尺寸的Fe(Cu,Co)小液滴,过冷度越大,VM/VS越大.
出处 《中国科学(G辑)》 CSCD 2007年第3期376-384,共9页
基金 国家自然科学基金资助项目(批准号:50121101 50395105)
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参考文献20

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