Direct observation of local atomic order in a metallic glass

Hirata, Akihiko; Guan, Ping; Fujita, Takeshi; Hirotsu, Yoshihiko; Inoue, Akihisa; Yavari, A.R.; Sakurai, Takeshi; Chen, Mingwei

doi:10.1038/nmat2897

Cited by 513 publications

(281 citation statements)

References 32 publications

Supporting

Mentioning

264

Contrasting

Unclassified

Order By: Relevance

“…2. Taking FeNi oxides as an example, precursor solutions containing Pluronic P123, Fe(NO 3 ) 3 and/or Ni(NO 3 ) 2 salts were first sprayed into droplets by an ultrasonic humidifier. The mist (the right-hand side, Fig.…”

Section: Reviewsmentioning

confidence: 99%

“…13b compares the cycling performance of amorphous CoSnO 3 nanoboxes with and without carbon coating, CoSnO 3 nanocubes, crystalline Co-Sn-O nanoboxes and commercial SnO 2 particles. Both amorphous CoSnO 3 and CoSnO 3 @C nanoboxes exhibit much better cycling performance compared with those of the crystalline materials. The authors believed the atomically mixed, homogeneously amorphous structure of CoSnO 3 may contribute to their lithium storage performance because the volume change upon cycling can be partly mitigated in an isotropic, loose/dense structure with high atomic/ionic mobility.…”

Section: Applications Electrochemical Electrode Materialsmentioning

confidence: 99%

“…Nevertheless, the less explored amorphous materials are, the more fascinating they are to researchers. Some important findings related to the internal structure of metallic glass, e.g., short-range order [2,3], medium-range order [4,5], polymorphism [6], and long-range topological order [7], have been reported recently. Effort has also been devoted to the study of local atomic environment [8,9] and lithium transport [10] in other kinds of amorphous materials.…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Tailoring the shape of amorphous nanomaterials: recent developments and applications

2015

View full text Add to dashboard Cite

Nanoscale amorphous materials are very important member of the non-crystalline solids family and have emerged as a new category of advanced materials. However, morphological control of amorphous nanomaterials is very difficult because of the atomic isotropy of their internal structures. In this review, we introduce some emerging innovative methods to fabricate well-defined, regular-shaped amorphous nanomaterials. We then highlight some examples to evaluate the use of these amorphous materials in electrodes, and their optical response. There is still plenty of room to explore the amorphous world. As researchers continue to advance the scientific tools that underpin the concepts related to "amorphous", additional applications of these materials will emerge. Their controlled synthesis will undoubtedly attain new heights in the discipline of nanomaterials, and allow nanoscale amorphous materials to become more sophisticated, diverse, and mainstream.

show abstract

Section: Reviewsmentioning

confidence: 99%

Section: Applications Electrochemical Electrode Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Tailoring the shape of amorphous nanomaterials: recent developments and applications

2015

View full text Add to dashboard Cite

show abstract

“…The deformation mechanisms of such amorphous solid state are in sharp contrast with their crystalline counterparts since there are no long-range atoms packing pattern in MGs [2,3]. No conventional mechanisms, such as ordinary dislocation plasticity or deformation twinning in crystals, exist in MGs which can carry plastic deformation.…”

mentioning

confidence: 99%

Direct atomic-scale evidence for shear–dilatation correlation in metallic glasses

et al. 2016

View full text Add to dashboard Cite

Direct atomic-scale evidence is presented for the shear-dilatation correlation in metallic glasses via molecular dynamics and first-principles calculations. A quantitative parabolic relationship is established between the atomic local shear and hydrostatic volumetric strains by carrying out statistical analysis on a deformed glass model. The correction is further verified by density functional theory. Our atomistic demonstration of shear-dilatation correlation collaborates with the experimentally observed a few percent volume change in shear bands. It brings quantitative insights into the unique correlation between shear transformation and cavitation in metallic glasses.© 2015 Elsevier Ltd. All rights reserved.Metallic glasses (MGs) are a category of promising high strength structural materials with many other superior physical and chemical properties [1]. The deformation mechanisms of such amorphous solid state are in sharp contrast with their crystalline counterparts since there are no long-range atoms packing pattern in MGs [2,3]. No conventional mechanisms, such as ordinary dislocation plasticity or deformation twinning in crystals, exist in MGs which can carry plastic deformation. Therefore MGs usually suffer from the notorious catastrophic failure with a strong strain localization (shear banding) phenomenon [4,5].Several models have been proposed to rationalize the inelastic deformation of MGs, which include free volume [6], shear transformation zone (STZ) [7][8][9], cooperative shear model (CSM) [10,11], flow unit [12], vibrational soft spot [13], shear-diffusive transformation [14,15], and our recently proposed tensile transformation zone (TTZ) [16][17][18]. All of these models are based on the local structural rearrangement of atoms via the interplay of atomic-scale shear and dilation/contraction in MGs [19][20][21][22][23][24]. Among them, Argon's STZ model involves local rearrangement of a cluster of atoms undergoing a stress-driven, and thermally activated shear distortion [25,23,24]. Whereas Spaepen's free volume model is based on a dynamic equilibrium between the stress-assisted creation and annihilation of free volume [6]. The free volume behaviors can be regarded as dilation and contraction of local atomic environments. Since both models have been successfully adopted to describe the homogeneous and inhomogeneous flows in MGs, there should be some intrinsic correlation between shear and dilatation/compaction during deformation of glasses [21,26].Generally, shear-dilatation correlation is an intrinsic nature of deformation in amorphous alloys although local compaction is also allowed [27,28]. For example, intuitively derived law between shear strain and local dilatation has been used in constitutive modelings of MGs [29]. Shear is not necessarily the only deformation mode accommodating the local atomic rearrangement. The microscopic scenario is that the STZ operations redistribute stress spatially which usually leads to the creation of free volume via atomic-scale dilatation [21,1]. So that local ...

show abstract

“…All the methods of studying the local structure of metallic glasses just provide the average and one-dimensional structural information. In 2010, Hirata et al 114 investigated the configuration of metallic glass by nanobeam electron diffraction (NBED) combined with AIMD. They first directly observed the local atomic structure in metallic glasses.…”

Section: Direct Observation Of the Local Structure In Metallic Glassesmentioning

confidence: 99%

The Development of Structure Model in Metallic Glasses

et al. 2017

Self Cite

View full text Add to dashboard Cite

Metallic glasses (amorphous alloys) have grown from a singular observation to an expansive class of alloys with a broad range of scientific interests. Their unique properties require a robust understanding on the structures at the atomic level while alloys in this class have a similar outlook on the microstructure. In this review, we went through the history of the majority studies on the structure models of metallic glasses, and summarized their historical contributions to the understanding of the structure metallic glasses and the relationship between their structures and properties.

show abstract

Direct observation of local atomic order in a metallic glass

Cited by 513 publications

References 32 publications

Tailoring the shape of amorphous nanomaterials: recent developments and applications

Tailoring the shape of amorphous nanomaterials: recent developments and applications

Direct atomic-scale evidence for shear–dilatation correlation in metallic glasses

The Development of Structure Model in Metallic Glasses

Contact Info

Product

Resources

About