Correlation Between Local Atomic Symmetry and Mechanical Properties in Metallic Glasses

Li, M.Z.

doi:10.1016/j.jmst.2014.05.001

Cited by 40 publications

(11 citation statements)

References 57 publications

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“…Based on the Voronoi analysis, we define the average degree of κ -fold local symmetry as , where P i is the fraction of polyhedron type i and represents the fraction of κ -edged polygon in Voronoi polyhedron type i and is defined as (ref. 29 ). Here denotes the number of κ -edged polygon in Voronoi polyhedron type i .…”

Section: Resultsmentioning

confidence: 99%

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Five-fold symmetry as indicator of dynamic arrest in metallic glass-forming liquids

et al. 2015

Nat Commun

237

111

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With sufficient high cooling rates, a variety of liquids, including metallic melts, will cross a glass transition temperature and solidify into glass accompanying a marked increase of the shear viscosity in approximately 17 orders of magnitude. Because of the intricate atomic structure and dynamic behaviours of liquid, it is yet difficult to capture the underlying structural mechanism responsible for the marked slowing down during glass transition, which impedes deep understanding of the formation and nature of glasses. Here, we report that a universal structural indicator, the average degree of five-fold local symmetry, can well describe the slowdown dynamics during glass transition. A straightforward relationship between structural parameter and viscosity (or α-relaxation time) is introduced to connect the dynamic arrest and the underlying structural evolution. This finding would be helpful in understanding the long-standing challenges of glass transition mechanism in the structural perspective.

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Section: Resultsmentioning

confidence: 99%

“…Even for the icosahedral clusters, they are found to be distorted and show diverse configurations in MGs 15 . Therefore, metallic liquids and glasses cannot be modelled by a uniquely prescribed stereochemical structure 26 28 29 .…”

mentioning

confidence: 99%

Five-fold symmetry as indicator of dynamic arrest in metallic glass-forming liquids

et al. 2015

Nat Commun

237

111

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“…This also indicates that L atoms are more likely to participate in the soft modes. Recently, the correlation between local structures and soft modes has been examined [35]. It is found that local structures with smaller local fivefold symmetry participate more in the soft modes.…”

Section: Discussionmentioning

confidence: 99%

“…It has been shown that the soft regions are only close to the instability and the next plastic event cannot be predicted until the glass is brought close to the instability [34]. Although the irreversible atomic rearrangements are correlated with the low shear modules [36][37][38], soft modes [32,33], and local atomic symmetry [35], they do not exactly correspond to the soft modes, low shear modules, or local atomic symmetries [35,39]. This might be due to the very complex and highly distorted local topology motifs in metallic glasses which could exhibit quite different dynamical and mechanical response [40].…”

Section: Discussionmentioning

confidence: 99%

Evolution of atomic rearrangements in deformation in metallic glasses

Shang

Yao

et al. 2014

Phys. Rev. E

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Atomic rearrangements induced by shear stress are fundamental for understanding deformation mechanisms in metallic glasses (MGs). Using molecular dynamic simulation, the atomic rearrangements characterized by nonaffine displacements (NADs) and their spatial distribution and evolution with tensile stress in Cu 50 Zr 50 MG were investigated. It was found that in the elastic regime the atomic rearrangements with the largest NADs are relatively homogeneous in space, but exhibit strong spatial correlation, become localized and inhomogeneous, and form large clusters as strain increases, which may facilitate the so-called shear transformation zones. Furthermore, initially they prefer to take place around Cu atoms which have more nonicosahedral configurations. As strain increases, the preference decays and disappears in the plastic regime. The atomic rearrangements with the smallest NADs are preferentially located around Cu atoms, too, but with more icosahedral or icosahedral-like atomic configurations. The preference is maintained in the whole deformation process. In contrast, the atomic rearrangements with moderate NADs distribute homogeneously, and do not show explicit preference or spatial correlation, acting as matrix during deformation. Among the atomic rearrangements with different NADs, those with largest and smallest NADs are nearest neighbors initially, but separating with increasing strain, while those with largest and moderate NADs always avoid to each other. The correlations in the fluctuations of the NADs confirm the long-range strain correlation and the scale-free characteristic of NADs in both elastic and plastic deformation, which suggests a universality of the scaling in the plastic flow in MGs.

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“…Several recent reports through both experimental and simulated studies, elucidate the important aspect of local atomic structure analysis to engender a deeper understanding of the structural properties of metallic glasses [12][13][14][15][16][17][18]. Investigation of local atomic structure in metallic glasses is further crucial to the understanding of their structure-property relationships; in particular, their mechanical properties as evinced by relevant literature [9,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Evolution of local atomic structure accompanying devitrification of amorphous Ni-Zr alloy thin films

et al. 2022

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Correlation Between Local Atomic Symmetry and Mechanical Properties in Metallic Glasses

Cited by 40 publications

References 57 publications

Five-fold symmetry as indicator of dynamic arrest in metallic glass-forming liquids

Five-fold symmetry as indicator of dynamic arrest in metallic glass-forming liquids

Evolution of atomic rearrangements in deformation in metallic glasses

Evolution of local atomic structure accompanying devitrification of amorphous Ni-Zr alloy thin films

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