Strength of the repulsive part of the interatomic potential determines fragility in metallic liquids

Pueblo, C. E.; Sun, Minhua; Kelton, K. F.

doi:10.1038/nmat4935

Cited by 38 publications

(22 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently, Krausser et al connected the fragility and viscoelasticity of metallic liquids to the atomic connectivity, controlled by the steepness of the repulsive short‐range interatomic interaction, leading to fragile behavior with steep interatomic repulsion and to a strong glass when the repulsion is softer. In contrast, the experimental results demonstrated that unlike the colloidal glass, stronger metallic liquids could inversely have steeper repulsive potentials …”

Section: Fragility and Glass Transition Of Metallic Liquidsmentioning

confidence: 79%

Perspective on Structural Evolution and Relations with Thermophysical Properties of Metallic Liquids

Wang

Jiang

2017

Advanced Materials

View full text Add to dashboard Cite

The relationship between the structural evolution and properties of metallic liquids is a long-standing hot issue in condensed-matter physics and materials science. Here, recent progress is reviewed in several fundamental aspects of metallic liquids, including the methods to study their atomic structures, liquid-liquid transition, physical properties, fragility, and their correlations with local structures, together with potential applications of liquid metals at room temperature. Involved with more experimentally and theoretically advanced techniques, these studies provide more in-depth understanding of the structure-property relationship of metallic liquids and promote the design of new metallic materials with superior properties.

show abstract

Section: Fragility and Glass Transition Of Metallic Liquidsmentioning

confidence: 79%

Perspective on Structural Evolution and Relations with Thermophysical Properties of Metallic Liquids

Wang

Jiang

2017

Advanced Materials

View full text Add to dashboard Cite

show abstract

“…On the other hand, the inherent interaction between atoms in inorganic materials can determine their mechanical properties as well. For example, the strength of the repulsive part of the interatomic potential, which can be determined by the analysis of the steepness of the pair distribution function near the hard‐sphere cutoff acquired from the X‐ray scattering data, was evidenced to reflect the fragility of metallic liquids . Thus, the flexibility of SNWs should arise their size and composition.…”

Section: Polymer‐like Behavior Of Snwsmentioning

confidence: 99%

The Sub‐Nanometer Scale as a New Focus in Nanoscience

2018

View full text Add to dashboard Cite

Size is one of the central issues in nanoscience. The practical meaning of the term "sub-nanometric material (SNM)" requires two aspects: (1) its size should be at the atomic level; (2) it shows unique (size-related) properties compared to its nano-counterparts with larger sizes. Here, SNMs in the form of wires (SNWs) and the unique properties arising from their special size are reviewed. First, their polymer-like behavior, including rheological behavior and self-assembly, is dicussed. Their origins may stem from the special size and the ligands around the wire. Even a slight increase in diameter would risk the polymer-like behavior. Meanwhile, the ligands on SNWs are proportional to the inorganic entity at this scale. Consequently, surface ligands should have a profound impact on the properties, like catalysis, self-assembly, optics, etc. To reveal more potential applications, their applications in energy conversion are comprehensively reviewed. To some extent, characterization can greatly influence the way things are observed. Thus, some appropriate characterization techniques are briefly introduced. Finally, another emerging part of SNWs (atomic chain material) is briefly introduced. It is hoped that this review can provide new insights to this special scale.

show abstract

“…We reflect on why the fragilities of Al-MGs are so high and why they tend to correlate with the glass forming ability. At present, the origin of fragility is still not clearly established [40,[63][64][65][66][67][68]. A useful proposal that might be relevant for the Al-MGs can be developed based on the work of Tanaka and coworkers [67,68].…”

mentioning

confidence: 99%

“…Another framework to rationalize the fragility is based on the interatomic potentials [65,66]. Krausser et al [65] proposed that MGs with a steeper (or harder) repulsive part of the interatomic interaction were more fragile.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Revealing hidden supercooled liquid states in Al-based metallic glasses by ultrafast scanning calorimetry: Approaching theoretical ceiling of liquid fragility

et al. 2019

View full text Add to dashboard Cite

Metallic glasses (MGs) are amorphous alloys with a number of unique properties that are attractive for the fundamental understanding of the nature and applications of disordered systems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Generally, MGs might be grouped into two categories based on their glass forming ability (i.e., the ease of glass formation by cooling a liquid): in one case, large or bulk volumes may be slowly cooled to the glassy state from the melt. This category is usually called as bulk metallic glass formers [18][19][20][21][22]. In contrast, certain MGs, represented by aluminum (Al)- [23,24] and some iron (Fe)- [25,26] based MGs, can be synthesized mainly by rapid solidification processes such as melt spinning or vapor deposition. These MGs are often denoted as marginal MG-formers [23][24][25].With the rapid developments of MGs, many previously identified marginal glass formers have been successfully made into bulk metallic glasses by composition strategies (such as Fe-and Ni-based MGs) [8,25,26,28]. However, one remarkable exception is the family of Al-based MGs [23,24]. Although there have been continuous efforts in optimizing compositions and improving processing techniques since its first discovery [29] several decades ago, the glass forming ability of Al-MGs is still limited nowadays [23,30,31]. Recently, Wu et al. [30] reported that the hitherto best glass forming ability for Al-MGs is from Al 86 Ni 6.75 Co 2.25 Y 3.25 La 1.75 with a fully glassy rod of 1.5 mm in diameter. Although the glassy rod can reach 2.5 mm for the same composition after a refined fluxtreatment of the liquid [31], this critical size is still much smaller than those of typical Zr-based MGs (~75 mm) [32], Mg-MGs (25 mm) [18] and Pd-MGs (80 mm) [33]. Moreover, the glass forming ability of Al-MGs is very sensitive to compositions. Only a few percent change of the constituting elements would dramatically reduce this critical size [21,27,30,34,35]. Consequently, it is more difficult to develop Al-MGs than other MGs. Fundamentally, it remains to be a puzzling issue why the Al-MGs are so unique [27,30,36].Among several factors, one clue for the distinction between bulk glasses and marginal glass formers is based upon their supercooled liquids [19,23,26,27]. The change of the relaxation dynamics (e.g., viscosity, diffusivity or relaxation time) with the temperature is highly materialspecific. Angell introduced the concept of fragility (m) for the classification of glass-forming materials, which was defined as the apparent activation energy of relaxation time τ α normalized to glass transition temperature T g : m = dlog(τ α )/(dT g /T)| T=T g [37]. A stronger deviation from Arrhenius behavior (with a larger m value) corresponds to a more fragile system; otherwise, the system is strong [37][38][39][40]. Wang et al. [41] theoretically pointed out that the fragility index for non-polymeric glasses should have a lower limit m = 16.5, and an upper limit m~175.Recently, Johnson et al.[42] conducted a critical asses...

show abstract

Strength of the repulsive part of the interatomic potential determines fragility in metallic liquids

Cited by 38 publications

References 35 publications

Perspective on Structural Evolution and Relations with Thermophysical Properties of Metallic Liquids

Perspective on Structural Evolution and Relations with Thermophysical Properties of Metallic Liquids

The Sub‐Nanometer Scale as a New Focus in Nanoscience

Revealing hidden supercooled liquid states in Al-based metallic glasses by ultrafast scanning calorimetry: Approaching theoretical ceiling of liquid fragility

Contact Info

Product

Resources

About