Structural evolution in Ni–Nb and Ni–Nb–Ta liquids and glasses — A measure of liquid fragility?

Mauro, N. A.; Johnson, Mark L.; Bendert, J. C.; Kelton, K. F.

doi:10.1016/j.jnoncrysol.2012.11.022

Cited by 36 publications

(25 citation statements)

References 53 publications

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“…Three distinct regions of behaviour are observed for Ni 62 Nb 38 : (1) the liquid, for which S(q 1 ) evolves very slowly with temperature, dominated by changes in the local atomic structure; (2) the glass, where S(q 1 ) also changes slowly but owing to atomic vibrational contributions rather than significant structural rearrangements; and (3) an experimentally inaccessible region linking the other two regions that requires an acceleration in the development of S(q 1 ). This acceleration of order has been observed in a few metallic glass-forming systems with poor GFA [14][15][16] and this behaviour is contrasted with that of the evolution of S(q 1 ) for Vit 106a, where it changes gradually from the liquid to the glass (Fig. 2b).…”

Section: Resultsmentioning

confidence: 78%

A structural signature of liquid fragility

et al. 2014

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Virtually all liquids can be maintained for some time in a supercooled state, that is, at temperatures below their equilibrium melting temperatures, before eventually crystallizing. If cooled sufficiently quickly, some of these liquids will solidify into an amorphous solid, upon passing their glass transition temperature. Studies of these supercooled liquids reveal a considerable diversity in behaviour in their dynamical properties, particularly the viscosity. Angell characterized this in terms of their kinetic fragility. Previous synchrotron X-ray scattering studies have shown an increasing degree of short-and medium-range order that develops with increased supercooling. Here we demonstrate from a study of several metallic glass-forming liquids that the rate of this structural ordering as a function of temperature correlates with the kinetic fragility of the liquid, demonstrating a structural basis for fragility.

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Section: Resultsmentioning

confidence: 78%

A structural signature of liquid fragility

et al. 2014

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“…Such an argument was also used for interpretation of the glassformation in Ni [34]. Similar in-situ structural observations were made for fragile Ni-Nb [35] alloys.…”

Section: Introductionmentioning

confidence: 71%

Structural changes in liquid Fe and Fe–B alloy on cooling

Louzguine-Luzgin

Georgarakis

Tsarkov

et al. 2015

Journal of Molecular Liquids

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“…Other work equates strong liquid behaviour (i.e. a weak change in structure) with high glassforming ability [342,343].…”

Section: Glassforming Ability In Metallic Systemsmentioning

confidence: 99%

The role of local structure in dynamical arrest

Royall

Williams²

2015

Physics Reports

394

446

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Amorphous solids, or glasses, are distinguished from crystalline solids by their lack of long-range structural order. At the level of two-body structural correlations, glassformers show no qualitative change upon vitrifying from a supercooled liquid. Nonetheless the dynamical properties of a glass are so much slower that it appears to take on the properties of a solid. While many theories of the glass transition focus on dynamical quantities, a solid's resistance to flow is often viewed as a consequence of its structure. Here we address the viewpoint that this remains the case for a glass. Recent developments using higher-order measures show a clear emergence of structure upon dynamical arrest in a variety of glass formers and offer the tantalising hope of a structural mechanism for arrest. However a rigorous fundamental identification of such a causal link between structure and arrest remains elusive. We undertake a critical survey of this work in experiments, computer simulation and theory and discuss what might strengthen the link between structure and dynamical arrest. We move on to highlight the relationship between crystallisation and glass-forming ability made possible by this deeper understanding of the structure of the liquid state, and emphasize the potential to design materials with optimal glassforming and crystallisation ability, for applications such as phase-change memory. We then consider aspects of the phenomenology of glassy systems where structural measures have yet to make a large impact, such as polyamorphism (the existence of multiple liquid states), aging (the time-evolution of non-equilibrium materials below their glass transition) and the response of glassy materials to external fields such as shear.Comment: 70 page

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Structural evolution in Ni–Nb and Ni–Nb–Ta liquids and glasses — A measure of liquid fragility?

Cited by 36 publications

References 53 publications

A structural signature of liquid fragility

A structural signature of liquid fragility

Structural changes in liquid Fe and Fe–B alloy on cooling

The role of local structure in dynamical arrest

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