Clustering, microalloying and mechanical properties in Cu/Zr-based glassy models by molecular dynamics simulations and ab-initio computations

Lekka, Ch.E.; Bokas, G.B.; Almyras, G.A.; Papageorgiou, D.G.; Evangelakis, G.A.

doi:10.1016/j.jallcom.2011.11.038

Cited by 25 publications

(11 citation statements)

References 29 publications

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“…Metallic glasses containing metalloid elements should be treated even more carefully. Different bond structures, bond lengths, and bond strengths can have a large influence on the plasticity of metallic glasses, the degree of heterogeneity, and therefore the outcome of the cryothermal cycling treatment 47,48 . For example, despite having a large Poisson's ratio, gold-based metallic glasses exhibit almost zero plasticity at room temperature and even elevated temperatures 49 .…”

Section: Discussionmentioning

confidence: 99%

On cryothermal cycling as a method for inducing structural changes in metallic glasses

et al. 2018

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The influence of cryothermal treatment on the mechanical properties of metallic glasses with different compositions was investigated in the present work. It was found that cryothermal cycling can induce rejuvenation as well as relaxation of the metallic glasses. The local apparent Young's modulus and its spatial distribution width on the surface of the metallic glass increase after cryothermal cycling, while in the bulk the effect depends on the glass composition. It appeared that this increase is temporary and disappears after a period of room temperature aging. This effect is connected with a large distribution of relaxation times in the metallic glasses due to their heterogeneous structure and the formation of complex native oxides on the outer surfaces of the glasses. Our findings reveal that a cryothermal cycling treatment can improve or degrade the plasticity of a metallic glass, and the atomic bond structure appears to be very important for the outcome of the treatment.

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Section: Discussionmentioning

confidence: 99%

On cryothermal cycling as a method for inducing structural changes in metallic glasses

et al. 2018

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“…It is well known that the MGs lack long range order but exhibit short-and medium-range orders [8]. Commonly, short-range order (SRO) is characterized by Voronoi polyhedrons (VPs) and medium-range order (MRO) by the arrangement of VPs into networks [9,10,11,12,13].…”

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confidence: 99%

On the role of Sm in solidification of Al-Sm metallic glasses

et al. 2016

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During the solidification of Al-Sm metallic glasses the evolution of the supercooled liquid atomic structure has been identified with an increasing population of icosahedral-like clusters with increasing Sm concentration. These clusters exhibit slower kinetics compared to the remaining clusters in the liquid leading to enhanced amorphous phase stability and glass forming ability (GFA). Maximum icosahedral-ordering and atomic packing density have been found for the Al 90 Sm 10 and Al 85 Sm 15 alloys, respectively, whereas minimum cohesive energy has been found for the Al 93 Sm 7 which is consistent with the range of compositions (from Al 92 Sm 8 to Al 84 Sm 16 ) found experimentally with high GFA.Keywords: metallic glass; short-range order; molecular dynamics; solidification.Metallic glasses (MGs) are known to have attractive mechanical properties such as high strength and high elastic limit, good corrosion and wear resistance and good biocompatibility [1,2,3]. However, the low glass forming ability (GFA) of some MGs has so far hindered synthesis of large MG specimens such as Al-base systems and therefore limited engineering applications of these materials. Many efforts have been devoted towards developing alloys with high GFA [1,4,5]. In particular, a number of studies focused on understanding of the MGs atomic structure and its relation to the MGs' mechanical properties

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“…They suggested that the interconnections of clusters and consequently the formation of the superclusters were topological 112 . This method may be used to interpret the design of new metallic glasses and to understand their experimental data 113 . …”

Section: Dense Packing Of Atomic Cluster Modelmentioning

confidence: 99%

The Development of Structure Model in Metallic Glasses

et al. 2017

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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.

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Clustering, microalloying and mechanical properties in Cu/Zr-based glassy models by molecular dynamics simulations and ab-initio computations

Cited by 25 publications

References 29 publications

On cryothermal cycling as a method for inducing structural changes in metallic glasses

On cryothermal cycling as a method for inducing structural changes in metallic glasses

On the role of Sm in solidification of Al-Sm metallic glasses

The Development of Structure Model in Metallic Glasses

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