Microstructure formation and electrical resistivity behavior of rapidly solidified Cu-Fe-Zr immiscible alloys

doi:10.1016/j.jmst.2019.10.038

Abstract

Abstract:

The immiscible Cu-Fe alloy was characterized by a metastable miscibility gap. With the addition element Zr, the miscibility gap can be extended into the Cu-Fe-Zr ternary system. The effect of the atomic ratio of Cu to Fe and Zr content on the behavior of liquid-liquid phase separation was studied. The results show that liquid-liquid phase separation into Cu-rich and Fe-rich liquids took place in the as-quenched Cu-Fe-Zr alloy. A glassy structure with nanoscale phase separation was obtained in the as-quenched (Cu_0.5Fe_0.5)₄₀Zr₆₀ alloy sample, exhibiting a homogeneous distribution of glassy Cu-rich nanoparticles in glassy Fe-rich matrix. The microstructural evolution and the competitive mechanism of phase formation in the rapidly solidified Cu-Fe-Zr system were discussed in detail. Moreover, the electrical property of the as-quenched Cu-Fe-Zr alloy samples was examined. It displays an abnormal change of electrical resistivity upon temperature in the nanoscale-phase-separation metallic glass. The crystallization behavior of such metallic glass has been discussed.

Key words: Immiscible alloys, Liquid-liquid phase separation, Rapid solidification, Microstructure, Electrical resistivity behavior

Xiaojun Sun, Jie He, Bin Chen, Lili Zhang, Hongxiang Jiang, Jiuzhou Zhao, Hongri Hao. Microstructure formation and electrical resistivity behavior of rapidly solidified Cu-Fe-Zr immiscible alloys[J]. J. Mater. Sci. Technol., 2020, 44: 201-208.

Figures/Tables 12

Fig. 1. SEM images of the as-quenched (a) (Cu0.55Fe0.45)90Zr10, (b) (Cu0.5Fe0.5)90Zr10, and (c) (Cu0.4Fe0.6)90Zr10 alloys, (d) size distribution of the particles in the as-quenched (Cu0.4Fe0.6)90Zr10 alloy.

Fig. 2. (a) XRD patterns and (b) DSC heating scans of as-quenched (Cu0.5Fe0.5)100-xZrx alloys.

Fig. 3. (a) STEM image of the as-quenched (Cu0.5Fe0.5)40Zr60 alloy (the inset is the SAED pattern), (b) size distribution of the glassy nanoparticles in the as-quenched (Cu0.5Fe0.5)40Zr60 alloy, (c) and (d) HRTEM images of the typical nanoparticles in the as-quenched (Cu0.5Fe0.5)40Zr60 alloy, exhibiting different appearances.

Fig. 4. XRD patterns of as-quenched (Cu1-xFex)40Zr60, Zr60Cu40, and Zr75Fe25 alloys.

Fig. 5. TEM image of as-quenched (Cu0.7Fe0.3)40Zr60 alloys.

Fig. 6. Gibbs free energies of the undercooled Cu-Fe melt at T = 1500 K: (a) Gibbs free energies GL and Gγ-Fe of the melt and γ-Fe, (b) Gibbs free energy difference for phase separation in liquid and solidification of γ-Fe.

Fig. 7. (a) Calculated metastable miscibility gap and DSC curves of the (Cu1-xFex)90Zr10 system, (b) and (c) SEM images of the (Cu0.4Fe0.6)90Zr10 and (Cu0.8Fe0.2)90Zr10 alloy samples after a cooling DSC circle.

Fig. 8. (a) Calculated metastable miscibility gap of the (Cu1-xFex)40Zr60 system, (b) schematic diagram of viscosity changing with temperature. TL and Ts present the liquidus temperature and onset temperature of LLPS, respectively.

Fig. 9. (a) Variation of nomalized resistivity with temperature and DSC heating curve of (Cu0.5Fe0.5)40Zr60 alloys, (b) Variation of nomalized resistivity with temperature of Zr60Cu40 and Zr75Fe25 alloys.

Fig. 10. Relationship between ln(T2/β) and 1/T. The subscripts 1, 2 and 3 present Zr75Fe25, Zr60Cu40, and (Cu0.5Fe0.5)40Zr60 alloys, respectively.

Fig. 11. XRD patterns of as-quenched (Cu0.5Fe0.5)40Zr60 alloys annealed at 673 K, 713 K, and 813 K for 0.5 h, respectively.

Fig. 12. (a) and (b) HRTEM images of (Cu0.5Fe0.5)40Zr60 alloys annealed at 673 K for 0.5 h.

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