Fe-Cu合金相分离过程

Fe-Cu合金相分离过程

采用喷铸和单辊旋淬快速冷却法制备Fe_（80）Cu_（20）,Fe_（60）Cu_（40）,Fe_（50）Cu_（50）3种成分Fe-Cu合金,利用SEM,XRD,DSC对其凝固微观组织、相结构及相变热力学过程进行观察和分析。结果表明：3种成分的Fe-Cu合金均发生了不同程度的相分离,且Cu含量越高,DSC降温曲线上出现的液-液相分离温度越高,结晶组织中相分离现象越明显;Fe_（80）Cu_（20）合金随着过冷度的增加,富Fe相枝晶晶粒尺寸变小的同时富Cu相的体积分数也不断减少,而Fe相、Cu相的晶格常数均随过冷度的增加而增大,过冷度的增加提高了分离相的固溶度;在Fe_（60）Cu_（40）及...

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Bibliographic Details
Published in:材料工程 Vol. 44; no. 2; pp. 115 - 121
Main Author: 何统求 王丽 彭传校 王胜海
Format: Journal Article
Language:Chinese
Published: 山东大学(威海)机电与信息工程学院,山东威海,264209 2016
Subjects:
Fe-Cu合金
二次相分离
快速凝固
降低界面能
快速凝固
二次相分离
secondary L-L phase separation
Fe-Cu合金
rapid solidification
降低界面能
Fe-Cu alloy
decrease of interfacial energy
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Summary:采用喷铸和单辊旋淬快速冷却法制备Fe_（80）Cu_（20）,Fe_（60）Cu_（40）,Fe_（50）Cu_（50）3种成分Fe-Cu合金,利用SEM,XRD,DSC对其凝固微观组织、相结构及相变热力学过程进行观察和分析。结果表明：3种成分的Fe-Cu合金均发生了不同程度的相分离,且Cu含量越高,DSC降温曲线上出现的液-液相分离温度越高,结晶组织中相分离现象越明显;Fe_（80）Cu_（20）合金随着过冷度的增加,富Fe相枝晶晶粒尺寸变小的同时富Cu相的体积分数也不断减少,而Fe相、Cu相的晶格常数均随过冷度的增加而增大,过冷度的增加提高了分离相的固溶度;在Fe_（60）Cu_（40）及Fe_（50）Cu_（50）合金中富Cu区出现二次相分离的富Fe小球,且富Fe小液滴不断聚集以降低界面能。揭示了Fe-Cu相分离型合金的快速凝固过程。
Bibliography:HE Tong-qiu, WANG Li, PENG Chuan-xiao, WANG Sheng-hai （School of Mechanical ＆ Electrical and Information Engineering, Shandong University（Weihai）, Weihai 264209, Shandong, China）
11-1800/TB
Fe-Cu alloy;secondary L-L phase separation;rapid solidification; decrease of interracial energy
Three kinds of Fe-Cu alloys Fe80 Cu20, Fe60 Cu40, Fe50 Cu20 were prepared respectively by spray casting and melt-spinning way. The microstructure, thermodynamics properties of Fe-Cu alloys during phase separation process were observed and analyzed through SEM, XRD and DSC measurement. The results show that three different Fe-Cu alloys have different levels of phase separation, the initial temperature of liquid-liquid （L-L） phase separation increases with increasing Cu content, meanwhile, phase separation phenomenon is more obvious. The grain size of Fe-rieh phase and the volume fraction in Fe80Cu20 decreases with increasing degree of undercooling, while the crystal lattice constant of both Fe and Cu phases increases gradually. The
ISSN:1001-4381
1001-4381
DOI:10.11868/j.issn.1001-4381.2016.02.018