Rheological behavior of Cu–Zr-based metallic glass in the supercooled liquid region

Cui, Jin; Li, J.S.; Wang, Jun; Kou, Hongchao; Qiao, J.C.; Gravier, S.; Blandin, J.J.

doi:10.1016/j.jallcom.2014.01.014

Cited by 18 publications

(9 citation statements)

References 42 publications

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“…5, the change of apparent viscosity η was obtained at various temperatures, which is depending on the strain rate. As reported in previous researches [15][16][17], a non-Newtonian behavior, which is characterized by the viscosity dependent on strain rate, is observed at lower temperature or at higher strain rate of quasi-static compression. At higher temperature or lower strain rate, a Newtonian behavior appears with the viscosity independent of strain rate.…”

Section: Resultssupporting

confidence: 71%

“…It clearly shows that the steady state flow stress increases with the stain rate. In the compressive strain rate jump tests, the apparent viscosity η of metallic glasses can be described as [16]:…”

Section: Resultsmentioning

confidence: 99%

“…Another approach that can unify the variations of the viscosity with different strain rates and temperatures to a master curve is to combine Eqs. (5) and (6), hence η / η N can be represented by [16]:…”

Section: Viscositymentioning

confidence: 99%

“…At high strain rates or low temperatures, the apparent viscosity decreases in compression with increasing of strain rate, and the glass exhibits Newtonian fluid behavior with the increase of temperature or decrease of strain rate [10][11][12][13][14]. In the homogeneous flow, the transition behaviors from Newtonian to non-Newtonian flow in the supercooled liquid region have been investigated for Pd-and Zr-based metallic glasses under constant strain-rate compression [14][15][16][17][18]. A master curve of the normalized viscosity η/η N versus N    at different temperatures can be obtained by using the stretched exponential function, but the physical meaning of fitting parameters still remains unclear and requires further research.…”

Section: Introductionmentioning

confidence: 99%

“…A master curve of the normalized viscosity η/η N versus N    at different temperatures can be obtained by using the stretched exponential function, but the physical meaning of fitting parameters still remains unclear and requires further research. More importantly, although the Newtonian viscosity can be calculated at a certain temperature [14][15][16][17], the transition strain rate from Newtonian to non-Newtonian flow is not clear at a certain temperature, and it is not yet understand how the transition strain rate changes with temperature.…”

Section: Introductionmentioning

confidence: 99%

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Arrhenius activation of Zr65Cu18Ni7Al10 bulk metallic glass in the supercooled liquid region

et al. 2017

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In the current research, the dynamic mechanical spectrum and compressive deformation of Zr 65 Cu 18 Ni 7 Al 10 bulk metallic glass in the supercooled liquid region (SLR) are investigated. The experimental results prove the existence of transition from Newtonian flow to non-Newtonian flow in the metallic glasses. In addition, we found that the characteristic stress σ tc , which is obtained by a stretched exponential function based on the normalized viscosity, can be regarded as a transition point from Newtonian to non-Newtonian flow. The correlation between strain rate sensitivity exponent and corresponding strain rate was obtained at a certain temperature. It is noted that the variation of transition strain rate from Newtonian to non-Newtonian flow with different absolute temperatures follows the Arrhenius equation. The activation energy is in good accordance with that using the mechanical spectroscopy method.

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Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Viscositymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Arrhenius activation of Zr65Cu18Ni7Al10 bulk metallic glass in the supercooled liquid region

et al. 2017

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Crystallization kinetics of Cu–Zr–Al bulk metallic glass with Nd addition

Yang

et al. 2021

Int J of Chemical Kinetics

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The crystallization kinetics of (Cu48Zr48Al4)100−xNdx (x = 0, 2 at.%) bulk metallic glasses in nonisothermal and isothermal conditions were studied by differential scanning calorimetry and X‐ray diffraction (XRD). XRD analysis shows that the crystallization product Cu10Zr7 changes to Cu10Zr7 and Cu2Nd with Nd presence in nonisothermal and isothermal conditions. Crystallization activation energy was calculated in nonisothermal conditions using Kissinger and Ozawa methods and in isothermal conditions using Arrhenius model. The results show that the activation energy harbored by (Cu48Zr48Al4)98Nd2 expresses larger value compared with Cu48Zr48Al4, which indicate that the energy barrier for crystallization has enhanced along the Nd addition. The Johnson–Mehl–Avrami model was employed for analyzing the crystallization kinetics in isothermal condition. The Avrami exponent n for Cu48Zr48Al4 is more than 2.5, demonstrating that the crystallization is mainly governed by diffusion‐controlled three‐dimensional growth with increasing nucleation rate. Comparably, the Avrami exponent n for (Cu48Zr48Al4)98Nd2 is 1.5 < n < 2.5, suggesting that the crystallization is mainly determined by diffusion‐controlled three‐dimensional growth with decreasing nucleation rate. The evident enhancement in crystallization activation energy based on Nd addition is rationally made up of an influential factor commonly harbored on the enhanced glass forming ability for the rare‐earth comprising Cu–Zr–Al metallic glasses.

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High temperature deformation behaviors of the Zr63.36Cu14.52Ni10.12Al12 bulk metallic glass

et al. 2016

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Rheological behavior of Cu–Zr-based metallic glass in the supercooled liquid region

Cited by 18 publications

References 42 publications

Arrhenius activation of Zr65Cu18Ni7Al10 bulk metallic glass in the supercooled liquid region

Arrhenius activation of Zr65Cu18Ni7Al10 bulk metallic glass in the supercooled liquid region

Crystallization kinetics of Cu–Zr–Al bulk metallic glass with Nd addition

High temperature deformation behaviors of the Zr63.36Cu14.52Ni10.12Al12 bulk metallic glass

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