Atomic dynamics in Zr-(Co,Ni)-Al metallic glass-forming liquids

Yuan, Changxia; Yang, Fan; Kargl, Florian; Holland‐Moritz, D.; Simeoni, Giovanna G.; Meyer, Andreas

doi:10.1103/physrevb.91.214203

Cited by 27 publications

(14 citation statements)

References 33 publications

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“…Moreover, Angell´s fragility factor m exhibited a maximum in the composition range with the best GFA, which is opposite to what is expected [4,22,24]. However, the kinetic effects may be crucial for the enhancement of GFA in TL-TE alloys on addition of Al [49]. Simultaneously, Δχexp/χa shows a sharp maximum at 33.3 at.% Cu where the stable bct CuZr2 compound forms ( Fig.…”

Section: Resultsmentioning

confidence: 71%

Electronic structure and glass forming ability in early and late transition metal alloys

Babić

Ristić

Figueroa

et al. 2017

Philosophical Magazine

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2A correlation between the change in magnetic susceptibility (Δχexp) upon crystallization of Cu-Zr and Hf metallic glasses (MG) with their glass forming ability (GFA) observed recently, is found to apply to Cu-Ti and Zr-Ni alloys, too.In particular, small Δχexp, which reflects similar electronic structures, ES, of glassy and corresponding crystalline alloys, corresponds to high GFA. Here, we studied Δχexp for five Cu-Ti and four Cu-Zr and Ni-Zr MGs. The fully crystalline final state of all alloys was verified from X-ray diffraction patterns. The variation of GFA with composition in Cu-Ti, Cu-Zr and Cu-Hf MGs was established from the variation of the corresponding critical casting thickness, dc. Due to the absence of data for dc in Ni-Zr MGs their GFA was described using empirical criteria, such as the reduced glass transition temperature. A very good correlation between Δχexp and dc (and/or other criteria for GFA) was observed for all alloys studied. The correlation between the ES and GFA showed up best for Cu-Zr and NiZr2 alloys where direct data for the change in ES (ΔES) upon crystallization are available. The applicability of the Δχexp (ΔES) criterion for high GFA (which provides a simple way to select the compositions with high GFA) to other metalmetal MGs (including ternary and multicomponent bulk MGs) is briefly discussed.

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Section: Resultsmentioning

confidence: 71%

Electronic structure and glass forming ability in early and late transition metal alloys

Babić

Ristić

Figueroa

et al. 2017

Philosophical Magazine

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“…This can be explained if one considers that smaller Cu atoms tend to surround larger Zr atoms and to nest into the corners of the d-wave outer shell of Zr. We also note here that similar electronic interactions affect the slowing down of the dynamics in Zr-(Cu/Ni/Co) melts with Al additions via an enhanced short-range packing between the Al and late-transition metal species [43][44][45].…”

Section: B Fitting Protocol Of G(r) Datamentioning

confidence: 59%

Unifying interatomic potential,g (r), elasticity, viscosity, and fragility of metallic glasses: analytical model, simulations, and experiments

et al. 2016

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An analytical framework is proposed to describe the elasticity, viscosity and fragility of metallic glasses in relation to their atomic-level structure and the effective interatomic interaction. The bottom-up approach starts with forming an effective Ashcroft-Born-Mayer interatomic potential based on Boltzmann inversion of the radial distribution function g(r) and on fitting the short-range part of g(r) by means of a simple power-law approximation. The power exponent λ represents a global repulsion steepness parameter. A scaling relation between atomic connectivity and packing fraction Z ∼ φ 1+λ is derived. This relation is then implemented in a lattice-dynamical model for the high-frequency shear modulus where the attractive anharmonic part of the effective interaction is taken into account through the thermal expansion coefficient which maps the φ-dependence into a T -dependence. The shear modulus as a function of temperature calculated in this way is then used within the cooperative shear model of the glass transition to yield the viscosity of the supercooled melt as a double-exponential function of T across the entire Angell plot. The model, which has only one adjustable parameter (the characteristic atomic volume for high-frequency cage deformation) is tested against new experimental data of ZrCu alloys and provides an excellent one-parameter description of the viscosity down to the glass transition temperature. arXiv:1608.03834v1 [cond-mat.soft]

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“…Note that for the packing fraction, derived from the macroscopic density of the melt, a statistical random distribution of atoms is assumed, while Zr-Ni melts are known to exhibit pronounced chemical short range order. 19,20 However, unlike the ternary Zr-(Co,Ni)-Al melts, 35 here an average molar volume (packing fraction) can still capture the composition dependence of the liquid viscosity qualitatively.…”

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confidence: 94%

“…We have shown that for the binary Zr-Ni system atomic packing qualitatively controls the viscosity. Combined with low temperature viscosity data, this allows to investigate the kinetic contribution to the glass formation 35 and related interesting phenomena, such as strong-fragile transitions. 6 We would like to thank the German Space Agency, Bonn, which enabled us to take part in the parabolic flight mission, and the members of the TEMPUS team for operating the TEMPUS facility.…”

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confidence: 99%

Viscosity measurements of metallic melts using the oscillating drop technique

Heintzmann

Yang

Schneider

et al. 2016

Applied Physics Letters

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By means of benchmarking reduced gravity experiments, we have verified the measured viscosity of binary Zr-Ni glass forming liquids utilizing the oscillating drop technique combined with ground-based electrostatic levitation (ESL). Reliable viscosity data can be obtained as long as internal viscous damping of a single oscillation mode of a levitated drop dominates external perturbations. This can be verified by the absence of a sample mass dependence of the results. Hence, ESL is an excellent tool for studying the viscosity of metallic glass forming melts in the range of about 10–250 mPa s, with sample masses below 100 mg. To this end, we show that, for binary Zr-Ni melts, the viscosity is qualitatively controlled by the packing density.

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Atomic dynamics in Zr-(Co,Ni)-Al metallic glass-forming liquids

Cited by 27 publications

References 33 publications

Electronic structure and glass forming ability in early and late transition metal alloys

Electronic structure and glass forming ability in early and late transition metal alloys

Unifying interatomic potential,g (r), elasticity, viscosity, and fragility of metallic glasses: analytical model, simulations, and experiments

Viscosity measurements of metallic melts using the oscillating drop technique

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