Atomic structure and formation of CuZrAl bulk metallic glasses and composites

Kaban, I.; Jóvári, P.; Escher, B.; Tran, Dung Trung; Svensson, Gunnar; Webb, Mark; Regier, Tom; Kokotin, V.; Beuneu, B.; Gemming, Thomas; Eckert, J.

doi:10.1016/j.actamat.2015.08.060

Cited by 36 publications

(16 citation statements)

References 48 publications

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“…In general, bond shortening is often observed in many intermetallic crystalline compounds and even some glassy alloys25262948. Nevertheless, bond shortening between Zr-Nb pair possessing a PHM is a surprising observation in this work and should be explained.…”

Section: Resultsmentioning

confidence: 64%

“…Fortunately, revealing the mechanism of the glass formation in alloys from the structural perspective is an effective approach and has been pursued for decades181920212223. In particular, recently, the structural mechanism of microalloying effect on the GFA has been studied in many multicomponent alloys242526272829. Therefore, this issue is expected to be addressed by studying the atomic-to-cluster level microstructure.…”

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confidence: 99%

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Structural mechanism of the enhanced glass-forming ability in multicomponent alloys with positive heat of mixing

Wei

Guo

et al. 2016

Sci Rep

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The issue, microalloying certain element with positive heat of mixing leading to the enhanced glass forming ability (GFA) in multicomponent alloys, has been investigated by systematic experimental measurements coupled with theoretical calculations. It is found that in the Nb-doped CuZr alloys, strong interaction between Nb and Zr atoms leads to a shortened pair distance. In addition, fraction of the icosahedral-like local structures increases with Nb addition and Nb solutes are apt to be separated with each other. These factors contribute to an increase of the atomic level efficiency to fill space and formation of the short-to-medium range orderings. As a result, the amorphous structure is stabilized and the GFA is enhanced accordingly. This work provides an in-depth understanding of microalloying-induced high GFAs in multicomponent alloys and is helpful for guiding the development of more metallic glasses with high GFAs via microalloying, despite the positive heat of mixing between the constituent elements.

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Section: Resultsmentioning

confidence: 64%

mentioning

confidence: 99%

Structural mechanism of the enhanced glass-forming ability in multicomponent alloys with positive heat of mixing

Wei

Guo

et al. 2016

Sci Rep

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“…In the current study, the flash Joule heating of the Cu 47.5 Zr 47.5 Al 5 metallic glass leads to its devitrification into two phases: metastable B2 CuZr and equilibrium Cu 10 Zr 7 . This finding is in contrast to the equilibrium phase diagram [39] and some experimental as well as theoretical studies on the devitrification sequence of CuZr-based metallic glasses [33,35,38,40]. Based on theoretical considerations, Kaban et al suggested that the Cu 47.5 Zr 47.5 Al 5 metallic glass devitrifies following the sequence Cu 10 Zr 7 →CuZr 2 →B2 CuZr [40].…”

Section: Resultsmentioning

confidence: 85%

Fabrication of Metastable Crystalline Nanocomposites by Flash Annealing of Cu47.5Zr47.5Al5 Metallic Glass Using Joule Heating

et al. 2020

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Flash Joule-heating was applied to the Cu47.5Zr47.5Al5 metallic glass for designing fully crystalline metastable nanocomposites consisting of the metastable B2 CuZr and low-temperature equilibrium Cu10Zr7 phases. The onset of crystallization was in situ controlled by monitoring resistivity changes in the samples. The effect of heating rate and annealing time on the volume fraction of the crystalline phases and mechanical properties of the nanocomposites was studied in detail. Particularly, an increase of the heating rate and a decrease of the annealing time lead to a lower number of equilibrium Cu10Zr7 precipitates and an increase of tensile ductility. Tailoring of these non-equilibrium microstructures and mechanical properties may not be possible unless one starts with a fully glassy material that opens new perspectives for designing metastable nanomaterials with unique physical properties.

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“…These values are compared with the results from neutron (N) scattering (Keen & Dove, 1999) and molecular dynamics (MD) simulations (Hoang, 2007 Figure 13 ED-based PDF (blue) of Cu 0.475 Zr 0.475 Al 0.05 metallic glass obtained using SUePDF compared with the corresponding X-ray data (Kaban et al, 2015) shown in red.…”

Section: Environment and Distribution Of Suepdfmentioning

confidence: 99%

SUePDF: a program to obtain quantitative pair distribution functions from electron diffraction data

Tran¹,

Svensson²,

Tai³

2017

J Appl Crystallogr

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SUePDF is a graphical user interface program written in MATLAB to achieve quantitative pair distribution functions (PDFs) from electron diffraction data. The program facilitates structural studies of amorphous materials and small nanoparticles using electron diffraction data from transmission electron microscopes. It is based on the physics of electron scattering as well as the total scattering methodology. A method of background modeling is introduced to treat the intensity tail of the direct beam, inelastic scattering and incoherent multiple scattering. Kinematical electron scattering intensity is scaled using the electron scattering factors. The PDFs obtained after Fourier transforms are normalized with respect to number density, nanoparticle form factor and the non-negativity of probability density. SUePDF is distributed as free software for academic users.

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Atomic structure and formation of CuZrAl bulk metallic glasses and composites

Cited by 36 publications

References 48 publications

Structural mechanism of the enhanced glass-forming ability in multicomponent alloys with positive heat of mixing

Structural mechanism of the enhanced glass-forming ability in multicomponent alloys with positive heat of mixing

Fabrication of Metastable Crystalline Nanocomposites by Flash Annealing of Cu47.5Zr47.5Al5 Metallic Glass Using Joule Heating

SUePDF: a program to obtain quantitative pair distribution functions from electron diffraction data

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