Effect of Adding Ag on the Nanoindentation Behavior of Cu-Zr-Al-Based Metallic Glass

doi:10.11900/0412.1961.2021.00009

Acta Metall Sin

2021, Vol. 57

Issue (4): 567-574 DOI: 10.11900/0412.1961.2021.00009

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Effect of Adding Ag on the Nanoindentation Behavior of Cu-Zr-Al-Based Metallic Glass

ZHANG Nizhen, MA Xindi, GENG Chuan, MU Yongkun, SUN Kang, JIA Yandong, HUANG Bo, WANG Gang(

)

School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

Cite this article:

ZHANG Nizhen, MA Xindi, GENG Chuan, MU Yongkun, SUN Kang, JIA Yandong, HUANG Bo, WANG Gang. Effect of Adding Ag on the Nanoindentation Behavior of Cu-Zr-Al-Based Metallic Glass. Acta Metall Sin, 2021, 57(4): 567-574.

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Abstract

Metallic glasses (MGs) with a long-range disordered structure and without crystallographic defects have attracted great research attention. Owing to the disordered structure, MGs usually exhibit excellent physical and chemical properties, comprehensive mechanical performances, and high thermal stability. Minor doping of elements can effectively enhance the glass-forming ability of MGs and then seriously affect the yielding strength and plasticity. In this study, a family of Cu₄₅Zr₄₅Al_10-_xAg_x (x = 1, 2, 3, and 5, atomic fraction, %) MG with minor Ag-addition was prepared by suction casting. A nanoindentation test was used to investigate the influence of Ag content on the nanoplastic deformation behavior of the Cu-Zr-Al-based MG. In terms of the empirical equation, the strain rate sensitivity index (m) was acquired to calculate the shear transformation zone volume during the nanoindentation creep process. Based on the Kohlrausch-Williams-Watts equation, the relaxation evolution was obtained. As Ag content approaches 5%, m attains its minimum, indicating that the creep resistance of the Cu-Zr-Al-based MG is the largest. The creep behavior of the system depends on the loading rate, i.e., the faster the loading rate, the lower the creep resistance. With an increase in the Ag content, the exponent stretch is increased, and the hardness of the Cu-Zr-Al-based MG was enhanced combined with an increased plasticity. This study presents the fundamental information of the relationship between the thermal dynamic and mechanical properties of the Cu-Zr-Al-based MG.

Key words: metallic glass creep depth shear transition zone volume relaxation

Received: 06 January 2021

ZTFLH:

TG139

Fund: National Natural Science Foundation of China(51925103)

About author: WANG Gang, professor, Tel: (021)66135269, E-mail: g.wang@shu.edu.cn

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	Nizhen ZHANG
	Xindi MA
	Chuan GENG
	Yongkun MU
	Kang SUN
	Yandong JIA
	Bo HUANG
	Gang WANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00009 OR https://www.ams.org.cn/EN/Y2021/V57/I4/567

Fig.1 XRD spectra (a) and DSC curves (b) of Cu₄₅Zr₄₅Al_10-_xAg_x metallic glasses, the peak center (c) and the full width at half maximum (FWHM) (d) of the first peak with pseudo-Voigt fitting (T_g—glass transition temperature, T_x—crystallization temperature)

Fig.2 Load vs depth curves of Cu₄₅Zr₄₅Al_10-_xAg_x metallic glasses at different loading rates

Fig.3 Creep depth vs time curves of Cu₄₅Zr₄₅Al_10-_xAg_x metallic glass at different loading rates

Fig.4 Creep depth vs time curve fitting with the Eq.(1) (a) and strain rate sensitivity coefficient m (b) of Cu₄₅Zr₄₅Al_10-_xAg_x metallic glass with x = 1 at a loading rate of 0.5 mN/s (R²—coefficient of determination, t—creep time, t₀—initial time of creep, h_fit—fitting function of creep depth, H—hardness)

Fig.5 Evolutions ofshear transformation zone volume (Ω) and activation volume (ΔV^*) with Ag content

Fig.6 Creep depth vs time curve of Cu₄₅Zr₄₅Al_10-_xAg_x metallic glass with x = 1 fitting with Eq.(9) (h₀—initial creep depth, τ'—relaxation time, β—stretch exponent)

Fig.7 Relationship between τ' (a) and β (b) with the loading rate, and relationship between τ' (c) and β (d) with Ag content

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