Effect of Zr addition on metastable Liquid-Liquid Phase Separation of Cu-Fe alloys

The liquid-liquid phase separation (LLPS) behavior was investigated in Cu-Fe alloys that consisted of 60 wt % or 80 wt % Cu and balance iron, without or with addition of 1 wt% Zr. Both Zr-free alloys clearly showed LLPS at metastable spinodal temperatures prior to γ-Fe nucleation, whereas Zr-added s...

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Bibliographic Details
Published inScripta materialia Vol. 205; p. 114218
Main Authors Moon, Ho-Joon, Yeo, Tae-min, Lee, Seung Hoon, Cho, Jung-Wook
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2021
Subjects
Copper alloy
Differential scanning calorimetry (dsc)
Liquid phase separation
Phase transformations
Differential scanning calorimetry (dsc)
Phase transformations
Liquid phase separation
Copper alloy
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Summary:The liquid-liquid phase separation (LLPS) behavior was investigated in Cu-Fe alloys that consisted of 60 wt % or 80 wt % Cu and balance iron, without or with addition of 1 wt% Zr. Both Zr-free alloys clearly showed LLPS at metastable spinodal temperatures prior to γ-Fe nucleation, whereas Zr-added showed γ-Fe phase evolution without LLPS. Addition of Zr was highly effective to activate γ-Fe nucleation by decreasing the mixing enthalpy and also accelerating heterogeneous nucleation. A combination of thermal instrumental analysis and classical nucleation theory yielded an effective assessment made of LLPS behavior below the liquidus temperature of Cu-Fe alloys. Furthermore, it was possible to control the solidification mechanism of Cu-Fe alloy by zirconium addition. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2021.114218