Effect of Zr Addition on Microstructure and Mechanical Properties of a Cast Cu60Fe40 Alloy

Jongun Moon; Eun Seong Kim; Yeon Taek Choi; Ho‑Joon Moon; Jung‑Wook Cho; Hyoung Seop Kim

doi:10.1007/s12540-022-01324-3

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자료유형: 학술저널

저자정보: Jongun Moon (Pohang University of Science and Technology (POSTECH)) Eun Seong Kim (Pohang University of Science and Technology (POSTECH)) Yeon Taek Choi (Pohang University of Science and Technology (POSTECH)) Ho‑Joon Moon (Pohang University of Science and Technology (POSTECH)) Jung‑Wook Cho (Pohang University of Science and Technology (POSTECH)) Hyoung Seop Kim (Pohang University of Science and Technology (POSTECH))

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.6

발행연도: 2023.6

수록면: 1,607 - 1,613 (7page)

DOI: 10.1007/s12540-022-01324-3

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Cu–Fe alloys have drawn extensive attraction due to excellent multi-functional properties, including electrical, magnetic,and mechanical properties. However, the immiscible nature of Cu–Fe alloys results in heterogeneous microstructure andunexpected mechanical properties. In this study, a small amount of Zr was added to the cast Cu60Fe40(wt%) alloy to suppressthe liquid–liquid phase separation during solidification of the alloy. The microstructure and mechanical propertiesof the Zr-free and Zr-containing Cu–Fe alloy were investigated. It is found that the addition of Zr successfully inhibits theheterogeneous microstructural evolution caused by liquid–liquid phase separation, while the FeZr-rich precipitates form inthe dual-phase microstructure. The FeZr-rich precipitates affect grain growth of the Zr-containing alloy through the Zenerpinning effect, leading to extra grain boundary strengthening and precipitation hardening. The resulting microstructure ofthe Zr-containing alloy substantially enhances the strength of the alloy with a loss of ductility. The fractured surface revealsthat microcracks are formed near the precipitates, which is associated with the reduced elongation of the Zr-containing alloy.

#Cu–Fe alloys · Liquid–liquid phase separation · Dual-phase · Mechanical properties · Precipitation hardening

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