Structural Relaxation in Supercooled Liquids

Shimono, Masato; Onodera, Hidehiro

doi:10.2320/matertrans.46.2830

Cited by 15 publications

(10 citation statements)

References 17 publications

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“…On the other hand, an off-eutectic composition as a solvent-rich composition is effective in enhancing the stability of glass structures through the formation of icosahedral-like clusters. 24,25) If the thermal stability of a glass structure depends on the quantity of icosahedral-like cluster formation, an optimized alloy composition should be formed by achieving a balance between the glass-firming ability and the stabilization of the glass structure. Figure 9 shows the relationship between the CUE values and the density of as-cast and annealed Zr 59 Cu 31 Al 10 BGAs.…”

Section: Discussionmentioning

confidence: 99%

Drastic Increase in the Toughness of Structural Relaxed Hypoeutectic Zr59Cu31Al10 Bulk Glassy Alloy

et al. 2007

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In order to improve embrittlement phenomena by structural relaxation, Zr-enriched hypoeutectic Zr-Cu-Al bulk glassy alloys (BGAs) were examined. During annealing for structural relaxation, the density increases significantly with annealing time from 10 3 s, and apparent saturation is seen at approximately 5.4 ks. Hardness and tensile strength do not change remarkably with annealing temperature. However, the Charpy impact value increases significantly by annealing at 648 K for 5.4 ks. The tendency of distinct increase of the Charpy impact value is maximized at Zr 59 Cu 31 Al 10 in hypoeutectic Zr-Cu-Al BGAs. A drastic increase in the Charpy impact value is accompanied by an increase in nonlinear density with increasing annealing temperature. Furthermore, the mechanical properties of fully structural relaxed Zr 59 Cu 31 Al 10 BGAs are characterized by their superior shear band formation and branching ability, which can be estimated by the shear slip width before shear band opening.

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Section: Discussionmentioning

confidence: 99%

Drastic Increase in the Toughness of Structural Relaxed Hypoeutectic Zr59Cu31Al10 Bulk Glassy Alloy

et al. 2007

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“…The glass-forming range by rapid quenching from liquid phases in this model system has been investigated in the previous studies [33][34][35] and the results are shown in Figure 8. The color of the glass-forming region indicates the cooling rate, where a darker region corresponds to a lower cooling rate.…”

Section: Atomic Size Effect On Glass-forming Ranges Of Model Binary Smentioning

confidence: 99%

Dynamics and Geometry of Icosahedral Order in Liquid and Glassy Phases of Metallic Glasses

Shimono

Onodera

2015

Metals

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Abstract:The geometrical properties of the icosahedral ordered structure formed in liquid and glassy phases of metallic glasses are investigated by using molecular dynamics simulations. We investigate the Zr-Cu alloy system as well as a simple model for binary alloys, in which we can change the atomic size ratio between alloying components. In both cases, we found the same nature of icosahedral order in liquid and glassy phases. The icosahedral clusters are observed in liquid phases as well as in glassy phases. As the temperature approaches to the glass transition point Tg, the density of the clusters rapidly grows and the icosahedral clusters begin to connect to each other and form a medium-range network structure. By investigating the geometry of connection between clusters in the icosahedral network, we found that the dominant connecting pattern is the one sharing seven atoms which forms a pentagonal bicap with five-fold symmetry. From a geometrical point of view, we can understand the mechanism of the formation and growth of the icosahedral order by using the Regge calculus, which is originally employed to formulate a theory of gravity. The Regge calculus tells us that the distortion energy of the pentagonal bicap could be decreased by introducing an atomic size difference between alloying elements and that the icosahedral network would be stabilized by a considerably large atomic size difference.

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“…Thus, the volume of a given atom is the volume of the polyhedron. Using this analytical technique as an analysis tool of atomic structure, a number of researchers have investigated the internal structure of metallic glasses [2,3,6].…”

Section: Introductionmentioning

confidence: 99%

Common errors of applying the Voronoi tessellation technique to metallic glasses

Park

Shibutani

2012

Intermetallics

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Structural Relaxation in Supercooled Liquids

Cited by 15 publications

References 17 publications

Drastic Increase in the Toughness of Structural Relaxed Hypoeutectic Zr<SUB>59</SUB>Cu<SUB>31</SUB>Al<SUB>10</SUB> Bulk Glassy Alloy

Drastic Increase in the Toughness of Structural Relaxed Hypoeutectic Zr<SUB>59</SUB>Cu<SUB>31</SUB>Al<SUB>10</SUB> Bulk Glassy Alloy

Dynamics and Geometry of Icosahedral Order in Liquid and Glassy Phases of Metallic Glasses

Common errors of applying the Voronoi tessellation technique to metallic glasses

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