Dynamic mechanical relaxation behavior of Zr35Hf17.5Ti5.5Al12.5Co7.5Ni12Cu10 high entropy bulk metallic glass

Zhang, L.T.; Duan, Y.J.; Wada, Takeshi; Kato, Hidemi; Pelletier, Jean-Marc; Crespo, Daniel; Pineda, Eloi; Qiao, J.C.

doi:10.1016/j.jmst.2020.11.074

Cited by 35 publications

(8 citation statements)

References 60 publications

(80 reference statements)

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“…However, whether these effects still exist in HE-MGs is still under discussion. Recent investigations have reported great advances in the influence of high configurational entropy on the thermodynamics and kinetics of HE-MGs [21][22][23][24] . Benefiting from the sluggish diffusion, the atomic rearrangements of HE-MGs are remarkably hindered 25 .…”

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confidence: 99%

Identifying the high entropy characteristic in La-based metallic glasses

Zhang

Duan

Crespo

et al. 2021

Applied Physics Letters

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High temperature deformation was probed in a La-based high entropy metallic glass with an evident slow β relaxation. The correlation between high configurational entropy and high temperature deformation mechanism was analyzed.On the one hand, by increasing the strain rate, the degree of deviation from Newtonian behavior in high entropy metallic glasses is lower than that of conventional metallic glasses, which is ascribed to the high configurational entropy. On the other hand, high configurational entropy leads to a decrease of activation volume in high temperature deformation of metallic glasses. Identifying the influence of high configurational entropy on the deformation mechanism paves the way for further understanding of the mechanical behavior of metallic glasses.

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confidence: 99%

Identifying the high entropy characteristic in La-based metallic glasses

Zhang

Duan

Crespo

et al. 2021

Applied Physics Letters

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“…Pt 20 Cu 20 Ni 20 P 20 HE-BMG exhibits a "shoulder"[53]. In this study, La 30 Ce 30 Ni 10 Al 20 Co 10 HE-BMG shows a conspicuous β relaxation peak for establishing the correlation between relaxation dynamics and creep mechanism.…”

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confidence: 50%

“…Figure 2 (Color online) (a) Dependence of the normalized storage modulus E′/E u and loss modulus E″/E u of the La 30 Ce 30 Ni 10 Al 20 Co 10 HE-BMG on temperature obtained at a driving frequency of 0.5 Hz and a heating rate of 3 K/min. Here, E u is the storage modulus at room temperature; (b) the normalized loss modulus E″/E″ max in La 30 Ce 30 Ni 10 Al 20 -Co 10 , Pd 20 Pt 20 Cu 20 Ni 20 P 20 , and Zr 35 Hf 17.5 Ti 5.5 Al 12.5 Co 7.5 Ni 12 Cu 10 HE-BMGs as a function of the normalized temperature T/T α[53]. E″ max is the maximum of the loss modulus, and T α is the temperature of the peak of the main α relaxation.…”

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confidence: 99%

Dynamic mechanical relaxation and thermal creep of high-entropy La30Ce30Ni10Al20Co10 bulk metallic glass

Zhang

Duan

Crespo

et al. 2021

Sci. China Phys. Mech. Astron.

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Dynamic mechanical relaxation is a fundamental tool to understand the mechanical and physical properties of viscoelastic materials like glasses. Mechanical spectroscopy shows that the high-entropy bulk metallic glass (La 30 Ce 30 Ni 10 Al 20 Co 10 ) exhibits a distinct β-relaxation feature. In the present research, dynamic mechanical analysis and thermal creep were performed using this bulk metallic glass material at a temperature domain around the β relaxation. The components of total strain, including ideal elastic strain, anelastic strain, and viscous-plastic strain, were analyzed based on the model of shear transformation zones (STZs). The stochastic activation of STZ contributes to the anelastic strain. When the temperature or external stress is high enough or the timescale is long enough, the interaction between STZs induces viscous-plastic strain. When all the spectrum of STZs is activated, the quasi-steady-state creep is achieved.

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“…In the temperature range of 600 K-730 K, the loss and storage moduli show the sharp increasing and decreasing trends, respectively. is event is associated to the β and α relaxations, occurring under the glass transition temperature [29,30]. Finally, the contradictory behavior of moduli above 770 K is correlated to the nucleation and growth of crystals in the microstructure [25].…”

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confidence: 95%

Influence of Microalloying Process on Dynamic Mechanical Relaxation of ZrCo-Based Amorphous Alloy

Romero-Parra

Patra

Fahim³

et al. 2022

Advances in Materials Science and Engineering

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In this study, the dynamic mechanical spectroscopy was used to characterize the effects of minor Ni addition on the relaxation behavior of ZrCoAl bulk metallic glass (BMG). For this purpose, the Kohlrausch–Williams–Watts (KWW) function and quasi-point defect (QPD) model were used for evaluation of relaxation under the different aging temperatures. The results indicated that the Ni addition shifted the relaxation process to the higher temperatures. Moreover, the estimations showed that the activation energy of relaxation was 5.951 eV and 6.205 eV for ZrCoAl and ZrCoAlNi, respectively. It was also revealed that the microalloying process enhanced the structural defects in the system and led to the improvement of dynamic heterogeneity in the BMG. Comparing the physical models, it is suggested that a small change in the structural defects intensifies the dynamic heterogeneity in the material.

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Dynamic mechanical relaxation behavior of Zr35Hf17.5Ti5.5Al12.5Co7.5Ni12Cu10 high entropy bulk metallic glass

Cited by 35 publications

References 60 publications

Identifying the high entropy characteristic in La-based metallic glasses

Identifying the high entropy characteristic in La-based metallic glasses

Dynamic mechanical relaxation and thermal creep of high-entropy La30Ce30Ni10Al20Co10 bulk metallic glass

Influence of Microalloying Process on Dynamic Mechanical Relaxation of ZrCo-Based Amorphous Alloy

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