Ultrahigh stability of atomically thin metallic glasses

Cao, Cheng; Huang, Kai; Zhao, Nanjing; Sun, Ying-Jian; Bai, H. Y.; Gu, Lin; Zheng, Dewen; Wang, W. H.

doi:10.1063/1.4890113

Cited by 17 publications

(4 citation statements)

References 35 publications

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“…41 Alternate explanations for the link between thermal stability and film thickness of TFMGs of other materials have also been put forth. 42 Differences between amorphous and crystalline phases are primarily described by the manner in which local structural units are connected or the short range structural difference. Although amorphous/glassy materials are usually classified as disordered, on an atomic scale, they are seen to constitute a local structural order.…”

Section: Journal Of Applied Physicsmentioning

confidence: 99%

Structure-property relations characterizing the devitrification of Ni-Zr glassy alloy thin films

Bhattacharya

Rayaprol

Ali

et al. 2019

Journal of Applied Physics

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The investigation of devitrification in thermally annealed nanodimensional glassy alloy thin films provides a comprehensive understanding of their thermal stability, which can be used to explore potential applications. The amorphous to crystalline polymorphous transformation of cosputtered Ni-Zr alloy (Ni78Zr22 at. %) films, with a thickness lower than the reported critical limit of devitrification, was studied through detailed structural characterization and molecular dynamics (MD) simulations. Devitrification to a nanocrystalline state (Ni 7 Zr 2 structure) was observed at 800°C, with an increase in density (∼3.6%) much higher than that achieved in bulk alloys. Variation in the magnetic property of the films and the overall physical structure including morphology and composition were examined before and after annealing. MD simulations were employed to effectively elucidate not only the high densification but also the increased magnetic moment after annealing, which was correlated with the simulated change in the coordination number around Ni atoms. The structural relaxation process accompanying devitrification was described as a disorder-to-order transformation while highlighting the crucial role played by chemical short range order prevalent in glassy materials.

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Section: Journal Of Applied Physicsmentioning

confidence: 99%

Structure-property relations characterizing the devitrification of Ni-Zr glassy alloy thin films

Bhattacharya

Rayaprol

Ali

et al. 2019

Journal of Applied Physics

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“…It has been shown that the MGs after the occurrence of LLPT often showed better stability 28,30,52 . These studies suggested that it is easier for the amorphous structure to approach the lowest energy state after relaxation [53][54][55] . These structural differences can lead to a dramatic change in other macroscopic properties.…”

Section: Discussionmentioning

confidence: 99%

Engineering medium-range order and polyamorphism in a nanostructured amorphous alloy

et al. 2019

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Like crystalline materials, the properties of amorphous materials can be tailored by tuning the local atomic-to-nanoscale structural configurations. Polyamorphism is evident by the coexistence of kinetically stabilized amorphous structures with tailorable short-to-medium-range orders, providing a viable means to engineer the degree of local order and heterogeneity. Here, we report experimental evidence of the coexistence of liquid-like and solid-like amorphous phases in a Ni 82 P 18 amorphous alloy with enhanced thermal stability and plasticity prepared by pulsed electrodeposition. The two amorphous phases, of comparable volume fraction of~50% each, have similar short-range order but are distinguished by packing at the medium-range length scale (>6 Å). Upon heating, a structure crossover at 450 K was observed, where the liquid-like structure transforms to the solid-like structure, as evidenced by the enthalpy release and an anomalous contraction of atomic structure over the medium-range length scale, due to the metastable nature of the liquid-like structure.

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“…Physical vapor deposition, as a classic example of gas-to-solid condensation, is widely used to synthesize metallic films with various crystalline, amorphous, and crystal−glass hybrid nanostructures and includes magnetron sputtering, 74 thermal evaporation, 75 and pulsed laser deposition. 76 To date, magnetron sputtering has been developed as the most common fabrication technology for SNDP-GC materials (Figure 3). As the sputtered atoms and atom clusters deposit on the cold substrate, the cooling rate is as high as ∼10 12 K/s.…”

Section: Supra-nano-dual-phase Glass−crystal Materialsmentioning

confidence: 99%

“…The condensation of a gas/liquid to a solid is an efficient strategy for preparing SNDP-GC materials directly without postprocessing. Physical vapor deposition, as a classic example of gas-to-solid condensation, is widely used to synthesize metallic films with various crystalline, amorphous, and crystal–glass hybrid nanostructures and includes magnetron sputtering, thermal evaporation, and pulsed laser deposition . To date, magnetron sputtering has been developed as the most common fabrication technology for SNDP-GC materials (Figure ).…”

Section: Supra-nano-dual-phase Materialsmentioning

confidence: 99%

Phase Engineering of Nanostructural Metallic Materials: Classification, Structures, and Applications

Gu,

Duan,

Liu

et al. 2024

Chem. Rev.

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Metallic materials are usually composed of single phase or multiple phases, which refers to homogeneous regions with distinct types of the atom arrangement. The recent studies on nanostructured metallic materials provide a variety of promising approaches to engineer the phases at the nanoscale. Tailoring phase size, phase distribution, and introducing new structures via phase transformation contribute to the precise modification in deformation behaviors and electronic structures of nanostructural metallic materials. Therefore, phase engineering of nanostructured metallic materials is expected to pave an innovative way to develop materials with advanced mechanical and functional properties. In this review, we present a comprehensive overview of the engineering of heterogeneous nanophases and the fundamental understanding of nanophase formation for nanostructured metallic materials, including supra-nano-dual-phase materials, nanoprecipitation-and nanotwin-strengthened materials. We first review the thermodynamics and kinetics principles for the formation of the supra-nano-dual-phase structure, followed by a discussion on the deformation mechanism for structural metallic materials as well as the optimization in the electronic structure for electrocatalysis. Then, we demonstrate the origin, classification, and mechanical and functional properties of the metallic materials with the structural characteristics of dense nanoprecipitations or nanotwins. Finally, we summarize some potential research challenges in this field and provide a short perspective on the scientific implications of phase engineering for the design of next-generation advanced metallic materials.

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Ultrahigh stability of atomically thin metallic glasses

Cited by 17 publications

References 35 publications

Structure-property relations characterizing the devitrification of Ni-Zr glassy alloy thin films

Structure-property relations characterizing the devitrification of Ni-Zr glassy alloy thin films

Engineering medium-range order and polyamorphism in a nanostructured amorphous alloy

Phase Engineering of Nanostructural Metallic Materials: Classification, Structures, and Applications

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