A structural signature of liquid fragility

Mauro, N. A.; Blodgett, M.; Johnson, Mark L.; Vogt, Adam; Kelton, K. F.

doi:10.1038/ncomms5616

Cited by 191 publications

(157 citation statements)

References 45 publications

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“…The viscosity or relaxation time of strong liquids behaves in nearly Arrhenius behavior, whereas fragile liquids show conspicuous deviation from Arrhenius fashion [4]. In analogy to Angell plot, we can also obtain the similar stress relaxation plot with time for various metallic glasses as shown in Fig.…”

Section: Lettersmentioning

confidence: 51%

Classification of metallic glasses based on structural and dynamical heterogeneities by stress relaxation

Bai

2015

Sci. China Mater.

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We show that the diverse dynamic responses of viscosity of the supercooled liquid near the glass transition temperature can be inherited to glassy state and expressed in the discrepancy of stress relaxation, demonstrating a structural heterogeneous basis for fragility. The metallic glasses with diverse dynamics and structural heterogeneities manifesting in different densities and distributions of flow units can be classified and characterized in terms of a parameter n, which can be readily determined through stress relaxation method and is comparable to the kinetic fragility m of the supercooled liquid. The parameter can classify diverse metallic glasses and also benefits for understanding the correlation between the structural and dynamical heterogeneities of the metallic glasses.Glassy state with unique and fascinating mechanical, dynamic and thermodynamic properties, which can be achieved by quenching from highly viscous liquid [1−4], is a universal property of condensed matter that lose its ability to flow. One of the most confusing issues in the glasses is that the viscosity ( η) of a glass-forming liquid can vary by several orders of magnitude in a narrow temperature range near the glass transition temperature (T g ) [5]. Based on the various responses of viscosity η to temperature, the kinetic fragility m is defined in terms of the shear viscosity η as [6−7]:The m, which is an index to characterize how fast the viscosity of glass-forming liquid increases with decreasing temperature while temperature (T) approaching T g , directly relates to the slowing down of the dynamics of the glass-forming liquids [6]. According to the concept of fragility, the glass-forming liquids can be roughly classified into two groups: strong and fragile liquids [6]. This classification attempts to construct a relation between the macroscopic transport property close to T g and the dynamics of glassy systems. After decades of researches, it has been found that the fragility can be traced back to dynamic and structural heterogeneities, topographic differences of the Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China * Corresponding author (email: hybai@iphy.ac.cn) energy landscape [7,8]. Some features and physical properties of the glass-forming liquids or the resultant glasses can also be correlated to the kinetic fragility, such as the temperature behavior of the shear elastic modulus [9], the specific heat jump at T g [10,11], Poisson's ratio [12], the glass-forming ability [13], and the vibrational properties of glasses far below T g [14]. Compared with other glasses such as polymer and oxide glasses, the supercooled liquid region of the metallic alloys is narrow and lack of thermal stability [15,16], the value of kinetic fragility m of the metallic glass-forming liquids is hard to be accurately detected, and only few compositions have the accurate values of fragility. Therefore, it is useful and important to find an accurate parameter to classify the metallic glasses far below T g .Recently, both comput...

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Section: Lettersmentioning

confidence: 51%

Classification of metallic glasses based on structural and dynamical heterogeneities by stress relaxation

Bai

2015

Sci. China Mater.

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“…Rapidly growing fluctuations in domain sizes are linked to the development of glassy dynamics, leading to the identification of another crossover at lower temperature, T D , which may be possible to observe in experimental structural studies [22,23]. While supercooling, these extensive domain then quickly stabilise, marked by a sudden drop in domain fluctuations, and percolate across the system before the temperature reaches T g .…”

Section: Introductionmentioning

confidence: 99%

A locally preferred structure characterises all dynamical regimes of a supercooled liquid

Soklaski

Tran

Nussinov

et al. 2016

Philosophical Magazine

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A locally preferred structure characterises all dynamical regimes of a supercooled liquid, Philosophical Magazine, 96:12, 1212-1227, DOI: 10.1080/14786435.2016 ABSTRACTRecent experimental results suggest that metallic liquids universally exhibit a high-temperature dynamical crossover, which is correlated with the glass transition temperature (T g ). We demonstrate, using molecular dynamics results for Cu 64 Zr 36 , that this temperature, T A ≈ 2 × T g , is linked with cooperative atomic rearrangements that produce domains of connected icosahedra. Supercooling to a new characteristic temperature, T D , is shown to produce higher order cooperative rearrangements amongst connected icosahedra, which manifests as the formation of large Zr-rich connected domains that possess macroscopic proportions of the liquid's icosahedra. This coincides with the decoupling of atomic diffusivities, largescale domain fluctuations and the onset of glassy dynamics in the liquid. These extensive domains then abruptly stabilise above T g and eventually percolate before the glass is formed. All characteristic temperatures (T A , T D and T g ) are thus connected by successive manifestations of the structural cooperativity that begins at T A . ARTICLE HISTORY

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“…Although lacking long-range order, metallic liquids do have short-range order (SRO) and medium-range order (MRO), which have been intensely studied in recent years, both experimentally [1][2][3][4][5][6][7][8][9][10][11] and from simulations [12][13][14] . The SRO and MRO are important for understanding the nucleation and growth of crystalline phases 15 and can provide insight into metastable phase and glass formation.…”

Section: Introductionmentioning

confidence: 99%

Measurements of structural and chemical order inZr80Pt20andZ
Johnson
¹
,
Blodgett
²
,
Lokshin
³

et al. 2016
Phys. Rev. B
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The short-and medium-range order of electrostatically levitated Zr 80 Pt 20 and Zr 77 Rh 23 liquids are presented, based on a combination of high-energy X-ray diffraction and time-of-flight neutron diffraction studies. The atomic structures of the Zr 80 Pt 20 liquids were determined as a function of temperature from constrained reverse Monte Carlo simulations using X-ray and elastic neutron scattering measurements and two partial pair-distribution functions obtained from molecular dynamics simulations. Analysis of both the Faber-Ziman and Bhatia-Thornton partial structure factors shows that the Zr 80 Pt 20 and Zr 77 Rh 23 liquids have similar topological short-range order. Interestingly, the chemical short-range order appears to be much more strongly tied to the topological order in the Zr 77 Rh 23 liquid than in the Zr 80 Pt 20 . These results demonstrate that the combination of experimental scattering measurements with molecular dynamics results provides a powerful approach for obtaining details of chemical and topological ordering in metallic glasses and liquids.

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A structural signature of liquid fragility

Cited by 191 publications

References 45 publications

Classification of metallic glasses based on structural and dynamical heterogeneities by stress relaxation

Classification of metallic glasses based on structural and dynamical heterogeneities by stress relaxation

A locally preferred structure characterises all dynamical regimes of a supercooled liquid

Measurements of structural and chemical order inZr80Pt20andZ
Johnson
¹
,
Blodgett
²
,
Lokshin
³

et al. 2016
Phys. Rev. B
Self Cite
30
0
13
0
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A structural signature of liquid fragility

Cited by 191 publications

References 45 publications

Classification of metallic glasses based on structural and dynamical heterogeneities by stress relaxation

Classification of metallic glasses based on structural and dynamical heterogeneities by stress relaxation

A locally preferred structure characterises all dynamical regimes of a supercooled liquid

Measurements of structural and chemical order inZr80Pt20andZJohnson1, Blodgett2, Lokshin3 et al. 2016Phys. Rev. BSelf Cite300130View full textAdd to dashboardCite

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Measurements of structural and chemical order inZr80Pt20andZ
Johnson
¹
,
Blodgett
²
,
Lokshin
³

et al. 2016
Phys. Rev. B
Self Cite
30
0
13
0
View full text Add to dashboard Cite