High temperature melt viscosity and fragile-to-strong transition in Zr-Cu-Ni-Al-Nb(Ti) and Cu47Ti34Zr11Ni8 bulk metallic glasses

Evenson, Zach; Schmitt, Tobias; Nicola, Mathias; Gallino, Isabella; Busch, Ralf

doi:10.1063/1.4794568

Cited by 9 publications

(14 citation statements)

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“…Thus, we expect to observe LLT also in other strong BMG-forming liquids 24,56 above their respective T g , if crystallization is avoided. Our study provides an important approach to experimental explorations of the LLT in metallic glass-forming systems and the LLT-correlated properties.…”

Section: Discussionmentioning

confidence: 99%

“…The hysteresis phenomena pronounced in viscosity 24 , the heat capacity peaks (Fig. 1) and the changes in structure factor S(Q) (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…However, there is direct and indirect evidence of the existence of a strong-fragile crossover 23,24 in bulk metallic glass (BMG)-forming liquids. This makes them of great interest to be studied to test the hypothesis of underlying lambda transitions that was originally based on simulations and network glass formers.…”

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confidence: 99%

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Liquid–liquid transition in a strong bulk metallic glass-forming liquid

et al. 2013

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Polymorphic phase transitions are common in crystalline solids. Recent studies suggest that phase transitions may also exist between two liquid forms with different entropy and structure. Such a liquid-liquid transition has been investigated in various substances including water, Al 2 O 3 -Y 2 O 3 and network glass formers. However, the nature of liquid-liquid transition is debated due to experimental difficulties in avoiding crystallization and/or measuring at high temperatures/pressures. Here we report the thermodynamic and structural evidence of a temperature-induced weak first-order liquid-liquid transition in a bulk metallic glassforming system Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 characterized by non-(or weak) directional bonds. Our experimental results suggest that the local structural changes during the transition induce the drastic viscosity changes without a detectable density anomaly. These changes are correlated with a heat capacity maximum in the liquid. Our findings support the hypothesis that the 'strong' kinetics (low fragility) of a liquid may arise from an underlying lambda transition above its glass transition.

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Section: Discussionmentioning

confidence: 99%

“…The hysteresis phenomena pronounced in viscosity 24 , the heat capacity peaks (Fig. 1) and the changes in structure factor S(Q) (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Liquid–liquid transition in a strong bulk metallic glass-forming liquid

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“…Cu 13.65 MGs are 0.822%, 0.536%, 0.418%, 0.436%, 0.31%, 0.25%, 0.147%, and 0.113%, respectively. We also indicated the value of fragility of these MGs, which are obtained from the literatures [30][31][32][33][34][35][36][37] in Fig. 1.…”

Section: Resultsmentioning

confidence: 99%

“…We also discuss the connections among the structural and dynamic heterogeneities, the density evolution, the distribution of flow units, and plasticity in MGs. [30][31][32][33][34][35][36][37] were selected. The master ingots with nominal compositions listed above were prepared by arc melting in a Tigettered argon atmosphere except the Pd 40 Ni 10 Cu 30 P 20 ingot which was prepared by induction melting in a high-vacuum quartz tube.…”

Section: Introductionmentioning

confidence: 99%

Correlation between density of metallic glasses and dynamic fragility of metallic glass-forming liquids

Xue

Zhao

Pan

et al. 2015

Journal of Non-Crystalline Solids

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We study the density evolution upon isothermal annealing far below the glass transition temperature of various metallic glasses (MGs) with different fragilities. We show that the density variation, which reflects the structural heterogeneity of MGs, has correlations with the Poisson's ratio and the kinetic fragility of their supercooled liquid state. The found relationship between the structure heterogeneity of metallic glasses and dynamic heterogeneity of their supercooled liquids has implications for understanding the structural heterogeneity and heredity, mechanical behaviors, and nature of metallic glass.

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Thermoplasticity of metallic glasses: Processing and applications

Sarac

Eckert

2022

Progress in Materials Science

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High temperature melt viscosity and fragile-to-strong transition in Zr-Cu-Ni-Al-Nb(Ti) and Cu47Ti34Zr11Ni8 bulk metallic glasses

Cited by 9 publications

References 0 publications

Liquid–liquid transition in a strong bulk metallic glass-forming liquid

Liquid–liquid transition in a strong bulk metallic glass-forming liquid

Correlation between density of metallic glasses and dynamic fragility of metallic glass-forming liquids

Thermoplasticity of metallic glasses: Processing and applications

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