Effect of Fe Content on the Microstructure, Electrical Resistivity, and Nanoindentation Behavior of Zr60Cu40-xFex Phase-Separated Metallic Glasses

doi:10.11900/0412.1961.2020.00137

Acta Metall Sin

2021, Vol. 57

Issue (5): 675-683 DOI: 10.11900/0412.1961.2020.00137

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Effect of Fe Content on the Microstructure, Electrical Resistivity, and Nanoindentation Behavior of Zr₆₀Cu₄₀_-_xFe_x Phase-Separated Metallic Glasses

SUN Xiaojun¹^,², HE Jie¹^,²(

), CHEN Bin¹^,², ZHAO Jiuzhou¹^,², JIANG Hongxiang¹, ZHANG Lili¹, HAO Hongri¹

^1.Shi -Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

SUN Xiaojun, HE Jie, CHEN Bin, ZHAO Jiuzhou, JIANG Hongxiang, ZHANG Lili, HAO Hongri. Effect of Fe Content on the Microstructure, Electrical Resistivity, and Nanoindentation Behavior of Zr₆₀Cu₄₀_-_xFe_x Phase-Separated Metallic Glasses. Acta Metall Sin, 2021, 57(5): 675-683.

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Abstract

Liquid-liquid phase separation was used to design phase-separated metallic glasses with special properties. In this work, Zr₆₀Cu_40-_xFe_x phase-separated metallic glasses were designed by partial substitution of Cu by Fe in Zr₆₀Cu₄₀ metallic glass. The liquid-liquid phase separation behavior of Zr₆₀Cu_40-_xFe_x alloy was investigated. The results show that the miscibility gap of the binary Cu-Fe system can be extended into the Zr₆₀Cu_40-_xFe_x system and that liquid-liquid phase separation into Cu-rich and Fe-rich liquids occurred during rapid cooling. On the basis of the behavior of liquid-liquid phase separation of the Zr₆₀Cu_40-_xFe_x system, the effect of partial substitution of Cu by Fe on the microstructure and phase formation of the Zr₆₀Cu_40-_xFe_x alloys was investigated. The microstructure evolution and the competitive mechanism of phase formation in the as-quenched Zr₆₀Cu_40-_xFe_x alloy were discussed. For the Zr₆₀Cu₂₀Fe₂₀ alloy, liquid-liquid phase separation into Cu-rich and Fe-rich liquids and then liquid-glass transition occurred during rapid cooling and resulted in a heterogeneous structure with glassy Fe-rich matrix embedded with glassy Cu-rich nanoparticles. Considering this structure, the electrical properties and nanoindentation behavior of the as-quenched Zr₆₀Cu₂₀Fe₂₀ alloy were examined. The abnormal change in electrical resistivity during crystallization and the effect of nanoscale phase separation on the shear transformation zone of the Zr₆₀Cu₂₀Fe₂₀ alloy were analyzed.

Key words: liquid-liquid phase separation immiscible alloy metallic glass electrical resistivity behavior nanoindentation

Received: 30 April 2020

ZTFLH:

TG113.11

Fund: National Natural Science Foundation of China(51774264);Natural Science Foundation of Liaoning Province(2019-MS-332)

About author: HE Jie, professor, Tel: (024)83973120, E-mail: jiehe@imr.ac.cn

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	Xiaojun SUN
	Jie HE
	Bin CHEN
	Jiuzhou ZHAO
	Hongxiang JIANG
	Lili ZHANG
	Hongri HAO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00137 OR https://www.ams.org.cn/EN/Y2021/V57/I5/675

Fig.1 XRD spectra (a) and DTA heating curves (b) of as-quenched Zr₆₀Cu_40-_xFe_x alloys (T_g—glass transition temperature; T_x1, T_x2—first and second crystallization temperatures, respectively)

Table 1 Thermal parameters of the Zr₆₀Cu_40-_xFe_x alloy

Fig.2 TEM images and corresponding SAED patterns (insets) of the as-quenched Zr₆₀Cu_40-_xFe_x alloys with x = 12 (a) and x = 20 (b)

Fig.3 Calculated miscibility gap of the Zr₆₀Cu_40-_xFe_x alloy (T_c—critical temperature of liquid-liquid phase separation)

Fig.4 Variation of normalized resistivity (ρ/ρ_{373 K}, ρ and ρ_{373 K} represent the resistivity of alloy at a temperature T and 373 K, respectively) with temperature of Zr₆₀Cu₂₀Fe₂₀, Zr₆₀Cu₄₀ and Zr₇₅Fe₂₅ alloys (a), and DSC heating curve of Zr₆₀Cu₂₀Fe₂₀ alloy (b)

Fig.5 XRD spectra of as-quenched Zr₆₀Cu₂₀Fe₂₀ alloys befor and after annealed at 673 K, 713 K, and 813 K for 0.5 h, respectively

Fig.6 HRTEM images of as-quenched Zr₆₀Cu₂₀Fe₂₀ alloys annealed at 673 K for 0.5 h

Fig.7 Nanoindentation force-displacement (P-h) curves of Zr₆₀Cu₂₀Fe₂₀, Zr₆₀Cu₄₀, and Zr₇₅Fe₂₅ alloys

Table 2 Hardness, elastic modulus, strain rate sensitivity (m), and shear transformation zone volume (Ω) of melt-spun ribbons from nanoindentation tests

Fig.8 Typical creep curves (a), variations of $ε ˙$ (b) and H′ (c) as a function of t during creep, and relationship of lnH′ vs ln $ε ˙$ (d) (t, $ε ˙$ , and H′ represent hold time, strain rate, and nanoindentation hardness, respectively)

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