Microstructure and solidification process of Fe-Cu immiscible alloy by using containerless process

Akira Kobayashi, Katsuhisa Nagayama

Research output: Research - peer-reviewArticle

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Abstract

Liquid phase separation usually occurs in immiscible alloys under gravity. The drop tube and electromagnetic levitation processes, which are types of containerless processes, enable solidification melt without using a container. This would avoid heterogeneous nucleation induced by the container walls, thus obtaining undercooling conditions. The abovementioned processes have been used to study the undercooling solidification and metastable phase formation of the melt. Metastable miscibility gap is observed in the Fe-Cu binary alloy; however, metastable phase formation in the wide composition range used by the drop tube process has never been reported. In this study, we obtained samples of Fe-Cu binary alloy using a drop tube apparatus with a free fall length of 2.5 m and an electromagnetic levitation apparatus. In addition, we aimed to examine the effectiveness of the containerless process for microstructure formation of the Fe-Cu binary alloy based on undercooling solidification. The results of the SEM and EDS analyses showed that the minor liquid phase, Fe or Cu, finely dispersed in the matrix of the major liquid phase of Fe75Cu25 and Fe25Cu75 particle samples, and the two or three layer structure of Fe50Cu50 particle samples. In particular, all the samples exhibited a phase separation caused by the metastable miscibility gap and the dendrite growth of Fe phase with the decrease of the cooling rate.

LanguageEnglish
Pages251-256
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume81
Issue number5
DOIs
StatePublished - 2017

Fingerprint

Undercooling
Binary alloys
Solidification
Microstructure
Liquids
solidification
microstructure
drop towers
supercooling
binary alloys
liquid phases
Metastable phases
Phase separation
Containers
Solubility
magnetic suspension
miscibility gap
containers
Energy dispersive spectroscopy
Gravitation

Keywords

  • Cooling rate
  • Dendrite growth
  • Drop tube
  • Electromagnetic levitation
  • Miscibility gap
  • Undercooling solidification

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "Liquid phase separation usually occurs in immiscible alloys under gravity. The drop tube and electromagnetic levitation processes, which are types of containerless processes, enable solidification melt without using a container. This would avoid heterogeneous nucleation induced by the container walls, thus obtaining undercooling conditions. The abovementioned processes have been used to study the undercooling solidification and metastable phase formation of the melt. Metastable miscibility gap is observed in the Fe-Cu binary alloy; however, metastable phase formation in the wide composition range used by the drop tube process has never been reported. In this study, we obtained samples of Fe-Cu binary alloy using a drop tube apparatus with a free fall length of 2.5 m and an electromagnetic levitation apparatus. In addition, we aimed to examine the effectiveness of the containerless process for microstructure formation of the Fe-Cu binary alloy based on undercooling solidification. The results of the SEM and EDS analyses showed that the minor liquid phase, Fe or Cu, finely dispersed in the matrix of the major liquid phase of Fe75Cu25 and Fe25Cu75 particle samples, and the two or three layer structure of Fe50Cu50 particle samples. In particular, all the samples exhibited a phase separation caused by the metastable miscibility gap and the dendrite growth of Fe phase with the decrease of the cooling rate.",
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author = "Akira Kobayashi and Katsuhisa Nagayama",
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journal = "Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals",
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AB - Liquid phase separation usually occurs in immiscible alloys under gravity. The drop tube and electromagnetic levitation processes, which are types of containerless processes, enable solidification melt without using a container. This would avoid heterogeneous nucleation induced by the container walls, thus obtaining undercooling conditions. The abovementioned processes have been used to study the undercooling solidification and metastable phase formation of the melt. Metastable miscibility gap is observed in the Fe-Cu binary alloy; however, metastable phase formation in the wide composition range used by the drop tube process has never been reported. In this study, we obtained samples of Fe-Cu binary alloy using a drop tube apparatus with a free fall length of 2.5 m and an electromagnetic levitation apparatus. In addition, we aimed to examine the effectiveness of the containerless process for microstructure formation of the Fe-Cu binary alloy based on undercooling solidification. The results of the SEM and EDS analyses showed that the minor liquid phase, Fe or Cu, finely dispersed in the matrix of the major liquid phase of Fe75Cu25 and Fe25Cu75 particle samples, and the two or three layer structure of Fe50Cu50 particle samples. In particular, all the samples exhibited a phase separation caused by the metastable miscibility gap and the dendrite growth of Fe phase with the decrease of the cooling rate.

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