Synthesis of amorphous ZrCu alloys by magnetron co-sputtering

Dudonis, J.; Bručas, Rimantas; Miniotas, A.

doi:10.1016/0040-6090(95)07033-8

Cited by 23 publications

(11 citation statements)

References 7 publications

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“…Systems with very large heats of mixing will have a stronger driving force for nucleation, which may reduce the barrier to nucleation significantly and thereby offset the gradient effect in retarding nucleation. 16 Copper-zirconium was selected as the first model system, as it has moderate heats of mixing, excellent glass-formability, particularly in sputtered films, [17][18][19] and provides two promising stable phases for investigation: Cu 10 Zr7 and CuZr 2 . 20,21 Of these two phases, Cu 10 Zr7 was selected to investigate.…”

Section: B Materials Selection and Sample Fabricationmentioning

confidence: 99%

“…19 The broad peaks are likely representative of Zr-rich (lower angle) and Cu-rich (higher angle) phases. 17,19,35,36 Based on prior diffraction data for Cu/Zr amorphous phases, 17,19,36 we estimate the composition of the Zr-rich phase at 80-90% Zr, and the Cu-rich phase at 15-25 % Zr. The second set of much smaller peaks are consistent with second order reflections from the amorphous phases.…”

Section: Sample Quantification-crystallinitymentioning

confidence: 99%

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A nanocalorimetric study of the effect of composition gradients on crystallization in amorphous Cu-Zr thin films

et al. 2019

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Nucleation, the initial formation of a new phase from a parent phase, plays an important role in the eventual microstructure and properties of materials. Theories and models of nucleation have been integral to materials science for close to a century. These models assume that the parent material is compositionally homogeneous on length-scales relevant to nucleation. However, in certain materials – such as thin films or reactive nanolaminates – sharp gradients in the composition may influence nucleation. Models and theories exploring these impacts are based on little direct experimental data. Here we present means of producing and characterizing samples with composition gradients to measure the impacts of gradients on nucleation. We fabricate amorphous Cu-Zr films with known composition gradients through their thicknesses; we perform isochronal nanocalorimetry to measure the impact of the gradients on nucleation and growth; and we characterize the samples before and after reaction. We see evidence of phase separation of the vapor-quenched Cu-Zr amorphous films. While we measure differences between the samples with gradients and those without, the gradients relax sufficiently during heating such that nucleation (the onset of crystallization) occurs at the same temperatures. For both sets of samples we find three distinct regions of heat release: the first we attribute to local ordering, the second to extended phase separation and interdiffusion, and the third to nucleation and growth of the Cu10Zr7 crystalline phase. This work represents a first step towards investigating the impact of gradients on nucleation, as well as growth.

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Section: B Materials Selection and Sample Fabricationmentioning

confidence: 99%

Section: Sample Quantification-crystallinitymentioning

confidence: 99%

A nanocalorimetric study of the effect of composition gradients on crystallization in amorphous Cu-Zr thin films

et al. 2019

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“…As an example, ZrCu alloys have attracted interest in recent years, due to their bulk metallic glass properties (Cheng, 2011;Wang, 2004;Yu, 2006;Pǎduraru, 2007;Mei-Bo, 2004), and as amorphous alloy films for their mechanical (Xu, 2004;Musil, 2003;Das, 2005) and superconductivity properties (Karpe, 1996). Dudonis et al (Dudonis, 1996) prepared thin films with Zr composition in the range of (5 ≤ x ≤ 95) by using high working power (490 W and 1380 W on Cu and Zr targets, respectively) during magnetron sputter deposition.…”

Section: Case Study 1: Zr X Cu 100-x (10 ≤ X ≤ 90) Thin Films Depositmentioning

confidence: 99%

Molecular dynamics simulations of clusters and thin film growth in the context of plasma sputtering deposition

Xie¹,

Brault²,

Bauchire³

et al. 2014

J. Phys. D: Appl. Phys.

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Carrying out molecular Dynamics simulations is a relevant way for understanding growth phenomena at the atomic scale. Initial conditions are defined for reproducing deposition conditions of plasma sputtering experiments. Two case studies are developed for highlighting the implementation of molecular dynamics simulations in the context of plasma sputtering deposition: Zr x Cu 1-x metallic glass and AlCoCrCuFeNi high entropy alloy thin films deposited onto silicon. Effects of depositing atom kinetic energies and atomic composition are studied in order to predict evolution of morphologies and atomic structure of MD grown thin films. Experimental and simulated X-ray diffraction patterns are compared.

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“…The interaction in the CuZr system is described by the EAM potential developed by Cheng et al [60], a widely used empirical model for describing interatomic interactions in metals and alloys [61]. The CuZr EAM potential fits the ab initio MD data and has been proved to predict the properties of crystalline phases and glassy states of CuZr correctly, which are consistent with the ab initio data [60] or experimental data [62,63].…”

Section: B Calculation Details For Cuzr and The Pure Cu Systemmentioning

confidence: 60%

Glassy nature and glass-to-crystal transition in the binary metallic glass CuZr

et al. 2017

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The prediction for the stability of glassy material is a key challenge in physical science. Here, we report a theoretical framework to predict the glass stability based on stochastic surface walking global optimization and reaction pathway sampling. This is demonstrated by revealing for the first time the global potential energy surface (PES) of two systems, CuZr binary metallic glass and nonglassy pure Cu systems, and establishing the lowest energy pathways linking glassy/amorphous structures with crystalline structures. The CuZr system has a significant number of glassy structures on PES that are ∼0.045 eV/atom above the crystal structure. Two clear trends are identified from global PES in the glass-to-crystal transition of the CuZr system: (i) the local Zr-Cu coordination (nearest neighbor) increases, and (ii) the local Zr bonding environment becomes homogeneous. This allows us to introduce quantitative structural and energetics conditions to distinguish the glassy structures from the crystalline structures. Because of the local Zr-Cu exchange in the glass-to-crystal transition, a high reaction barrier (>0.048 eV/atom) is present to separate the glassy structures and the crystals in CuZr. By contrast, the Cu system, although it does possess amorphous structures that appear at much higher energy (∼0.075 eV/atom) with respect to the crystal structure, has very low reaction barriers for the crystallization of amorphous structures, i.e. <0.011 eV/atom. The quantitative data on PES now available from global optimization techniques deepens our understanding on the microscopic nature of glassy material and might eventually facilitate the design of stable glassy materials.

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Synthesis of amorphous ZrCu alloys by magnetron co-sputtering

Cited by 23 publications

References 7 publications

A nanocalorimetric study of the effect of composition gradients on crystallization in amorphous Cu-Zr thin films

A nanocalorimetric study of the effect of composition gradients on crystallization in amorphous Cu-Zr thin films

Molecular dynamics simulations of clusters and thin film growth in the context of plasma sputtering deposition

Glassy nature and glass-to-crystal transition in the binary metallic glass CuZr

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