Relationship between the widths of supercooled liquid regions and bond parameters of Mg-based bulk metallic glasses

Fang, Shoushi; Xiao, Xiudi; Xia, Ling; Li, Weihuo; Dong, Yanhua

doi:10.1016/s0022-3093(03)00155-8

Cited by 332 publications

(152 citation statements)

References 19 publications

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“…A correlation between the electronegativity difference and atomic size with DT x values was also reported by Fang et al 29,30 They showed that DT x values are proportional to three parameters: the electronegativity difference, the atomic size and the valence electron difference, and a good correlation between calculated and experimental DT x values were described for Fe-, Pd-, and Mg-based alloys. Considering that the larger the DT x value, the higher the critical diameter for amorphization, we can say that the La 56 Al 26.5 Ni 17.5 alloy presents the best GFA in this system.…”

Section: -5supporting

confidence: 73%

“…Thus, much attention has been devoted in the past few years to develop better criteria to predict the best glass-forming composition(s) for different alloy systems or groups of systems. Some of these criteria are based on the electronic structure, 22 the formation enthalpy of amorphous and crystalline phases, 23,24 topological instability or destabilization of the host crystalline lattice, [25][26][27] the electronegativity difference, 25,[28][29][30] calculation of the liquidus temperature based on the computer calculation of phase diagrams (CALPHAD) technique 23 and structural models. 23,31,32 However, so far there is no universal model that can predict new amorphous compositions and, in fact, many researchers are presently evaluating the connection of the different criteria to refine and improve their forecast and to obtain a better agreement with experimental data.…”

Section: Introductionmentioning

confidence: 99%

“…Many works have described the influence of the electronegativity of the elements on the thermal behavior of amorphous alloys, [36][37][38] which is related to the enthalpy of formation (DH) 39 and glass stability. 29,30 The attractive force originates from the difference in electronegativity between the elements and is reflected in the heat of mixing. Elements with stronger attractive force exhibit larger heat of mixing, which favors the GFA, as also indicated by the well-known empirical rules.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of good glass formers in the Al-Ni-La and Al-Ni-Gd systems using topological instability and electronegativity

Gargarella

Oliveira

Kiminami

et al. 2011

Journal of Applied Physics

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Surface rippling on bulk metallic glass under nanosecond pulse laser ablation Appl. Phys. Lett. 99, 191902 (2011) Construction of a disorder variable from Steinhardt order parameters in binary mixtures at high densities in three dimensions J. Chem. Phys. 135, 174109 (2011) Fragility of iron-based glasses Appl. Phys. Lett. 99, 161902 (2011) Communication: Are metallic glasses different from other glasses? A closer look at their high frequency dynamics J. Chem. Phys. 135, 101101 (2011) Temperature dependence of the thermoplastic formability in bulk metallic glasses J. Appl. Phys. 110, 043518 (2011) Additional information on J. Appl. Phys. A new criterion has been recently proposed combining the topological instability (k criterion) and the average electronegativity difference (De) among the elements of an alloy to predict and select new glass-forming compositions. In the present work, this criterion (k.De) is applied to the Al-Ni-La and Al-Ni-Gd ternary systems and its predictability is validated using literature data for both systems and additionally, using own experimental data for the Al-La-Ni system. The compositions with a high k.De value found in each ternary system exhibit a very good correlation with the glassforming ability of different alloys as indicated by their supercooled liquid regions (DT x ) and their critical casting thicknesses. In the case of the Al-La-Ni system, the alloy with the largest k.De value, La 56 Al 26.5 Ni 17.5 , exhibits the highest glass-forming ability verified for this system. Therefore, the combined k.De criterion is a simple and efficient tool to select new glass-forming compositions in Al-Ni-RE systems.

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Section: -5supporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prediction of good glass formers in the Al-Ni-La and Al-Ni-Gd systems using topological instability and electronegativity

Gargarella

Oliveira

Kiminami

et al. 2011

Journal of Applied Physics

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“…For HEAs, in which there are no clear solvent or solute components, the formulation of the Hume-Rothery parameters requires modification. For δ, the following expression has been employed: 203,270 …”

Section: Phase Prediction and Alloy Selection In Heasmentioning

confidence: 99%

High-entropy alloys: a critical assessment of their founding principles and future prospects

Pickering

Jones

2016

International Materials Reviews

703

299

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High-entropy alloys (HEAs) are a relatively new class of materials that have gained considerable attention from the metallurgical research community over recent years. They are characterised by their unconventional compositions, in that they are not based around a single major component, but rather comprise multiple principal alloying elements. Four core effects have been proposed in HEAs: (1) the entropic stabilisation of solid solutions, (2) the severe distortion of their lattices, (3) sluggish diffusion kinetics and (4) that properties are derived from a cocktail effect. By assessing these claims on the basis of existing experimental evidence in the literature, as well as classical metallurgical understanding, it is concluded that the significance of these effects may not be as great as initially believed. The effect of entropic stabilisation does not appear to be overarching, insufficient evidence exists to establish the strain in the lattices of HEAs, and rapid precipitation observed in some HEAs suggests their diffusion kinetics are not necessarily anomalously slow in comparison to conventional alloys. The meaning and influence of the cocktail effect is also a matter for debate. Nevertheless, it is clear that HEAs represent a stimulating opportunity for the metallurgical research community. The complex nature of their compositions means that the discovery of alloys with unusual and attractive properties is inevitable. It is suggested that future activity regarding these alloys seeks to establish the nature of their physical metallurgy, and develop them for practical applications. Their use as structural materials is one of the most promising and exciting opportunities. To realise this ambition, methods to rapidly predict phase equilibria and select suitable HEA compositions are needed, and this constitutes a significant challenge. However, while this obstacle might be considerable, the rewards associated with its conquest are even more substantial. Similarly, the challenges associated with comprehending the behaviour of alloys with complex compositions are great, but the potential to enhance our fundamental metallurgical understanding is more remarkable. Consequently, HEAs represent one of the most stimulating and promising research fields in materials science at present.

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“…The metallic glass compositions were designed based on the synergic effect of topological instability, the λ-criterion, and the difference in the electronegativity of the elements 6,7 , combined with the average distribution of the chemical elements in the alloy. This criterion is strongly related with the efficient packing of atoms to form an icosahedral structure 8,9 . Close packing is a general criterion of packing efficiency.…”

Section: Introductionmentioning

confidence: 99%

New Zr-based glass-forming alloys containing Gd and Sm

et al. 2012

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The effect of minor additions of Gd and Sm on the glass-forming ability (GFA) of Cu-Zr-Al alloys is investigated here. The rationale for these additions is the fact that the atomic size distribution can increase GFA by changing the topology of the alloy as a function of cluster stability, which is tied to the electronegativity and ionic and covalent nature of alloys. Ingots with nominal compositions of Cu 40 Zr 49 Al 10.5 Gd 0.5 , Cu 40 Zr 49 Al 10.5 Sm 0.5 and Cu 39 Zr 50 Al 9 Gd 2 were prepared by arc-melting and rapidly quenched ribbons were produced by the melt-spinning technique. Bulk samples with a thickness of up to 10 mm were also produced by casting, using a wedge-shaped copper mold. The samples were characterized by differential scanning calorimetry, X-ray diffractometry and scanning electron microscopy. The three compositions showed a fully amorphous structure in the ribbons and a predominantly homogeneous amorphous structure with a thickness of up to 10 mm, although some gadolinium oxide crystals as well as samarium compounds were found to be scattered in the amorphous matrix in 5-mm-thick samples. The amorphous phases in the alloys showed high thermal stability with a supercooled liquid region (∆T x ) of about 70 K.

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Relationship between the widths of supercooled liquid regions and bond parameters of Mg-based bulk metallic glasses

Cited by 332 publications

References 19 publications

Prediction of good glass formers in the Al-Ni-La and Al-Ni-Gd systems using topological instability and electronegativity

Prediction of good glass formers in the Al-Ni-La and Al-Ni-Gd systems using topological instability and electronegativity

High-entropy alloys: a critical assessment of their founding principles and future prospects

New Zr-based glass-forming alloys containing Gd and Sm

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