The kinetic origin of delayed yielding in metallic glasses

Ye, Y.F.; Liu, X. D.; Wang, S.; Fan, Jun; Liu, C. T.; Yang, Yong

doi:10.1063/1.4954376

Cited by 8 publications

(3 citation statements)

References 64 publications

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“…Apart from this, quenching is also used to freeze in (vitrify) the high temperature structure at low temperatures. The best-known examples for those are metallic glasses 1 , 2 and high entropy alloys 3 formed at 10 6 to 10 12 °C s −1 cooling rates 4 . Phase selection using controlled cooling rates in these materials is crucial to arrest (select) structures that translate into desirable macroscopic properties for various engineering applications.…”

Section: Introductionmentioning

confidence: 99%

An unusual type of polymorphism in a liquid crystal

Salamończyk

Shadpour

et al. 2018

Nat Commun

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Polymorphism is a remarkable concept in chemistry, materials science, computer science, and biology. Whether it is the ability of a material to exist in two or more crystal structures, a single interface connecting to two different entities, or alternative phenotypes of an organism, polymorphism determines function and properties. In materials science, polymorphism can be found in an impressively wide range of materials, including crystalline materials, minerals, metals, alloys, and polymers. Here we report on polymorphism in a liquid crystal. A bent-core liquid crystal with a single chiral side chain forms two structurally and morphologically significantly different liquid crystal phases solely depending on the cooling rate from the isotropic liquid state. On slow cooling, the thermodynamically more stable oblique columnar phase forms, and on rapid cooling, a not heretofore reported helical microfilament phase. Since structure determines function and properties, the structural color for these phases also differs.

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Section: Introductionmentioning

confidence: 99%

An unusual type of polymorphism in a liquid crystal

Salamończyk

Shadpour

et al. 2018

Nat Commun

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“…Recently, a study on the yielding of MGs by Ye et al . 32 also showed that shear bands could form within the elastic stress range if a sufficient waiting time is provided. Hence the cycling frequency is expected to affect the shear banding behavior.…”

Section: Discussionmentioning

confidence: 92%

Notch fatigue behavior: Metallic glass versus ultra-high strength steel

Wang

et al. 2016

Sci Rep

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Studying the effect of notch on the fatigue behavior of structural materials is of significance for the reliability and safety designing of engineering structural components. In this work, we conducted notch fatigue experiments of two high-strength materials, i.e. a Ti32.8Zr30.2Ni5.3Cu9Be22.7 metallic glass (MG) and a 00Ni18Co15Mo8Ti ultra-high strength steel (CM400 UHSS), and compared their notch fatigue behavior. Experimental results showed that although both the strength and plasticity of the MG were much lower than those of the UHSS, the fatigue endurance limit of the notched MG approached to that of the notched UHSS, and the fatigue ratio of the notched MG was even higher. This interesting finding can be attributed to the unique shear banding mechanism of MG. It was found that during fatigue process abundant shear bands formed ahead of the notch root and in the vicinity of the crack in the notched MG, while limited plastic deformation was observed in the notched UHSS. The present results may improve the understanding on the fatigue mechanisms of high-strength materials and offer new strategies for structural design and engineering application of MG components with geometrical discontinuities.

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“…Consequently, the ST events can be preferentially activated at the weakest configurations due to their low shear modulus. In a metallic glass specimen experiencing a uniaxial stress lower than the yield strength, the solute-centered clusters and the superclusters act as the elastic backbone, while the scattered ST events activated at the weakest configurations contribute to the inelastic part [59]. As long as the isolated ST events do not percolate to a sizable length-scale, they can be reversed with the aid of the back-stress from the backbone upon unloading and the metallic glass behaves elastically on the macroscopic scale [60,61].…”

Section: Discussionmentioning

confidence: 99%

The correlation between weakest configurations and yield strength of Zr-based metallic glasses

Jiang

Ding

et al. 2017

Journal of Non-Crystalline Solids

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A direct relationship between the yield strength and the atomic ratio of solvent (Zr) atoms in the Zr-Cu-Al-Ni metallic glasses system is firstly uncovered. It is found that either shear modulus or yield strength decreases almost nearly with the increase in atomic ratio of Zr. The origin of this relationship is ascribed to the preferential straining of the weakest configurations, which consist of the solvent-solvent bonds and the free volume concentrated in them. It is suggested that a higher atomic ratio of Zr corresponds to a larger amount of weakest configurations, which will facilitate the activation and the accumulation of the shear transformations and finally results in the lower yield strength. This finding may provide an effective strategy for designing high-strength metallic glasses by modifying the chemical composition.

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The kinetic origin of delayed yielding in metallic glasses

Cited by 8 publications

References 64 publications

An unusual type of polymorphism in a liquid crystal

An unusual type of polymorphism in a liquid crystal

Notch fatigue behavior: Metallic glass versus ultra-high strength steel

The correlation between weakest configurations and yield strength of Zr-based metallic glasses

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