快速凝固Cu_(83)Fe_(17)合金的显微组织  

Microstructure of Rapidly Solidified Cu_(83)Fe_(17) Alloys

作　　者：周志明[1] 曹敏敏[1] 陈元芳[1] 唐丽文[1] 王亚平[2] 

机构地区：[1]重庆理工大学材料科学与工程学院,重庆市模具技术重点实验室 [2]西安交通大学理学院

出　　处：《特种铸造及有色合金》2009年第8期690-692,共3页Special Casting & Nonferrous Alloys

基　　金：重庆市教育委员会科学技术研究项目(KJ080611);新世纪优秀人才支持计划资助项目(NCET-07-0679);重庆市自然科学基金资助项目(CSCT2008BA3014)

摘　　要：通过采用扫描电镜(SEM)研究了真空感应熔炼和单辊旋铸Cu83Fe17合金的显微组织和凝固行为。结果表明,真空感应熔炼Cu83Fe17合金的显微组织主要以初生的富Fe枝晶形式存在于Cu基体中,单辊旋铸Cu83Fe17合金的显微组织呈现富Fe枝晶和富Fe球状并存的两种形貌。富Fe相的形貌和大小随着条带厚度的变化而变化。富Fe球的大小分布不均,靠近自由面的富Fe球直径比接触面要大。分析表明,合金快速凝固过程中发生了亚稳态的液相分离。此外,采用一维热传导方程对Cu83Fe17合金的冷却速度进行模拟,计算得到合金条带自由侧在凝固时的冷却速度为1.5×106K/s。Microstructure and solidification behavior of inducing melted Cu83Fe17 alloys and melt spun Cu83Fe17 alloys were investigated by scanning electron microscope (SEM). The results show that microstructure consists of fine primary Fe-rich dendrite existed in Cu-rich matrix in vacuum inducing melted Cu83Fe17 alloy,while both Fe-rich dendrites and Fe-rich spheroids appear in microstructure of melt-spun Cu83Fe17 alloy. The morphology and size of the Fe-rich phase are varied greatly with the change of ribbon thickness. The diameter of Fe-rich spheroids nearby surface-free is more than that nearby contacted surface,exhibiting non-uniform distribution,which is attributed to the appearance of metastable liquid phase separation during rapid solidification. In addition,the cooling rate for Cu83Fe17 alloy was calculated by one-dimensional heat conduction equation,and cooling rate of 1.5×106 K/s can be obtained at surface-free of the alloy ribbons with 200 μm in thickness.

关 键 词：Cu83Fe17 合金 冷却速度 显微组织 液相分离 

分 类 号：TG131[一般工业技术—材料科学与工程]