Structural Origin of the Enhanced Glass-Forming Ability Induced by Microalloying Y in the ZrCuAl Alloy

Guo, Gu-Qing; Wu, Shilin; Yang, Liang

doi:10.3390/met6040067

Cited by 7 publications

(7 citation statements)

References 49 publications

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“…GFA has been increasingly studied and considerable progress has been made in understanding the factors that promote easy glass formation [134][135][136][137] by alterations in both alloy composition and in the window of the processing conditions [4,138,139]. Now, alloys having a multicomponent composition can be cast into a glassy state even at slow cooling rates owing to their superior GFA [49,135,[140][141][142][143][144] which, in turn, is governed by various theories [137,140,[145][146][147][148][149][150][151][152][153][154][155][156] and analytical models [157,158]. Fundamentally, research over a period of time has yielded three basic laws, which are now considered universal for forming any BMG system [118].…”

Section: Three Lawsmentioning

confidence: 99%

Retracted: Development of Bulk Metallic Glass Matrix Composites (BMGMC) by Additive Manufacturing: Modelling and Simulation – A Review: Part A

Rafique

Niezgoda

Brandt

2019

AMR

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Bulk metallic glasses (BMGs) and their composites (BMGMC) have emerged as competitive materials for structural engineering applications exhibiting superior tensile strength, hardness along with very high elastic strain limit. However, they suffer from a lack of ductility and subsequent low toughness due to the inherent brittleness of the glassy structure which render them to failure without appreciable yielding owing to mechanisms of rapid movement of shear bands all throughout the volume of the material. This severely limits their use in fabricating structural and machinery parts. Various mechanisms have been proposed to counter this effect. Introduction of secondary ductile phase in the form of in-situ nucleating and growing dendrites from melt during solidification have proved out to be best solution of this problem. Nucleation and growth of these ductile phases have been extensively studied over the last 16 years since their introduction for the first time in Zr-based BMGMC by Prof. Johnson at Caltech. Data about almost all types of phases appearing in different systems have been successfully reported. However, there is very little information available about the precise mechanism underlying their nucleation and growth during solidification in a copper mould during conventional vacuum casting and melt pool of additively manufactured parts. Various routes have been proposed to study this including experiments in microgravity, levitation in synchrotron light and modelling and simulation. In this report consisting of two parts which is a preamble of author’s PhD Project, a concise review about evolution of microstructure in BMGMC during additive manufacturing have been presented with the aim to address fundamental problem of lack in ductility along with prediction of grain size and phase evolution with the help of advanced modelling and simulation techniques. It has been systematically proposed that 2 and 3 dimensional cellular automaton method combined with finite element (CAFE) tools programmed on MATLAB® and simulated on Ansys® would best be able to describe this phenomenon in most efficient way. Present part consists of general introduction of bulk metallic glass matrix composites (BMGMC), problem of lack of ductility in them, measures to counter it, success stories and their additive manufacturing.

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Section: Three Lawsmentioning

confidence: 99%

Retracted: Development of Bulk Metallic Glass Matrix Composites (BMGMC) by Additive Manufacturing: Modelling and Simulation – A Review: Part A

Rafique

Niezgoda

Brandt

2019

AMR

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“…Nanobeam electron diffraction (NBED) is an extension of ABED, with coherent electron beam probe size increasing to , which enables the detection of networks. For simulation of ABED/ NBED patterns, intensity of electron diffraction from cluster was calculated using the relation: 46 ( = scattering vector, electron scattering factor of individual atoms; distance between correlated atoms in clusters). Since cluster orientation in experimental sample can be random, all possible patterns (corresponding to different zone axes) for all possible FPMD cluster symmetries were simulated.…”

Section: Methodsmentioning

confidence: 99%

“…Diverse multi-scale structural probes have been devised. In SRO domain, site-resolved average cluster parameters are determined with “X-ray Absorption Fine Structure” (XAFS) 20 – 22 , 43 (or its combination with XRD 44 – 46 ); individual atomic positions are imaged with “Atom Probe Tomography” (3D-APT) 47 – 50 and “Atomic Electron Tomography” (AET) 51 – 53 , atomic arrangement within individual clusters are determined with “Angstrom Beam Electron Diffraction” (ABED) 54 . In MRO domain, conventional diffraction has limited success due to decreased order 55 – 57 .…”

Section: Introductionmentioning

confidence: 99%

Comprehensive characterization of the structure of Zr-based metallic glasses

Lahiri,

Krishna,

Verma

et al. 2024

Sci Rep

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Structure of metallic glasses fascinates as the generic amorphous structural template for ubiquitous systems. Its specification necessitates determination of the complete hierarchical structure, starting from short-range-order (SRO) → medium-range-order (MRO) → bulk structure and free volume (FV) distribution. This link has largely remained elusive since previous investigations adopted one-technique-at-a-time approach, focusing on limited aspects of any one domain. Reconstruction of structure from experimental data inversion is non-unique for many of these techniques. As a result, complete and precise structural understanding of glass has not emerged yet. In this work, we demonstrate the first experimental pathway for reconstruction of the integrated structure, for $${\text{Zr}}_{{{67}}} {\text{Ni}}_{{{33}}}$$ Zr 67 Ni 33 and $${\text{Zr}}_{{{52}}} {\text{Ti}}_{{6}} {\text{Al}}_{{{10}}} {\text{Cu}}_{{{18}}} {\text{Ni}}_{{{14}}}$$ Zr 52 Ti 6 Al 10 Cu 18 Ni 14 glasses. Our strategy engages diverse (× 7) multi-scale techniques [XAFS, 3D-APT, ABED/NBED, FEM, XRD, PAS, FHREM] on the same glass. This strategy complemented mutual limitations of techniques and corroborated common parameters to generate complete, self-consistent and precise parameters. Further, MRO domain size and inter-void separation were correlated to identify the presence of FV at MRO boundaries. This enabled the first experimental reconstruction of hierarchical subset: SRO → MRO → FV → bulk structure. The first ever image of intermediate region between MRO domains emerged from this link. We clarify that determination of all subsets is not our objective; the essence and novelty of this work lies in directing the pathway towards finite solution, in the most logical and unambiguous way.

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“…Among the main topics in the research of MGs, one can cite the glass-forming ability mechanism and mechanical properties, especially the plastic deformation aspects [29][30][31]. Regarding the latter, it has been proposed that the principal physical mechanism is the formation and rapid movement of the shear bands inside the material volume, which precludes the plasticity yielding [32].…”

Section: Introductionmentioning

confidence: 99%

The Molecular dynamics simulations of the mechanical behavior of nanostructured and amorphous Al80Ti15Ni5 alloy

Barboza

Bastos

Aliaga

2020

redin

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Classical deformation mechanisms based on crystalline defects of metallic polycrystals are not entirely suitable to describe the mechanical behavior of nanocrystalline and glassy materials. Their inherent complexity creates a real challenge to understand the acting physical phenomena. Thus, the molecular dynamics approach becomes interesting because it allows evaluating the mechanical properties and its related atomic structure. To study the atomic structure's influence on the deformation mechanisms at the nanoscale level of the Al80Ti15Ni5 alloy, molecular dynamics simulations, and post-processing techniques were used in the present work. The results revealed a significant dependency between the Young modulus and the atomic structure. Moreover, the type of structure, i.e., nanocrystalline or amorphous, governs the deformation mechanism type. For the nanocrystalline alloy, grain boundary sliding and diffusion seem to be the dominant deformation processes followed by the less essential emissions of partial dislocations from the grain boundaries. Concerning the amorphous material, the shear transformation zones begin to form in the elastic regime evolving to shear bands, these being the main mechanisms involved in the deformation process. The results also indicate the amorphous structure as a lower limit-case of the nanocrystal. The Al80Ti15Ni5 elastic moduli values were below expectations; for this reason, the effects of unary and ternary interatomic potentials were evaluated for each element.

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Structural Origin of the Enhanced Glass-Forming Ability Induced by Microalloying Y in the ZrCuAl Alloy

Cited by 7 publications

References 49 publications

Retracted: Development of Bulk Metallic Glass Matrix Composites (BMGMC) by Additive Manufacturing: Modelling and Simulation – A Review: Part A

Retracted: Development of Bulk Metallic Glass Matrix Composites (BMGMC) by Additive Manufacturing: Modelling and Simulation – A Review: Part A

Comprehensive characterization of the structure of Zr-based metallic glasses

The Molecular dynamics simulations of the mechanical behavior of nanostructured and amorphous Al80Ti15Ni5 alloy

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