Topological instability and electronegativity effects on the glass-forming ability of metallic alloys

Filho, Walter José Botta; Pereira, Flavio Soares; Kiminami, Cláudio Shyinti; Oliveira, Marcelo Falção de

doi:10.1080/09500830802375622

Cited by 42 publications

(31 citation statements)

References 21 publications

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“…Based on this assumption and considering all equilibrium phases, a k plot is built. 28 Nevertheless, as already discussed in, 25,28 the predictability of this criterion is improved when the electronegativity is considered. 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.…”

Section: Introductionmentioning

confidence: 94%

“…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. 23,28,33 Recently, a new criterion for the selection of amorphous alloys has been proposed with a combination of the topological instability (k criterion) and the average electronegativity difference among the elements of an alloy (De) and a good correlation has been found for binary systems. 25,28 The k criterion was firstly proposed by Egami and Waseda 34 to find the minimum solute concentration necessary to obtain amorphous phase by rapid quenching in a binary alloy system.…”

Section: Introductionmentioning

confidence: 99%

“…23,28,33 Recently, a new criterion for the selection of amorphous alloys has been proposed with a combination of the topological instability (k criterion) and the average electronegativity difference among the elements of an alloy (De) and a good correlation has been found for binary systems. 25,28 The k criterion was firstly proposed by Egami and Waseda 34 to find the minimum solute concentration necessary to obtain amorphous phase by rapid quenching in a binary alloy system. An extension of this criterion was proposed to describe the crystallization behavior of Al-based alloys 26 and to predict amorphization 35 by trying to avoid compositional fields associated with primary crystallization in any particular metallic alloy composition.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Bulk metallic glasses of nominal compositions Cu 36 Zr 59 Al 5 and Cu 54 Zr 40 Al 6 were chosen for study, by combining the criteria of the minimum topological instability and the average electronegativity (λ min •Δē) in the Cu-Zr-Al system 19,20 . At first, crystalline buttons were obtained by fusion of high pure materials (Cu, Zr, Al) in arc-melting under ultrapure argon atmosphere and Ti-gettered.…”

Section: Methodsmentioning

confidence: 99%

Mechanical spectroscopy study of the Cu36Zr59Al5 and Cu54Zr40Al6 amorphous alloys

et al. 2012

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A mechanical spectroscopy study of Cu-Zr-Al bulk metallic glasses, was performed with two types of equipment: a Kê-type inverted torsion pendulum and an acoustic elastometer, working in the frequency ranges of Hz and kHz, respectively, with a heating rate of 1 K/min. The analysis of the anelastic relaxation shows similar spectra for both types of equipment resulting in internal friction patterns that vary with temperature and are not reproducible at each thermal cycle. The normalized of the square of the frequency changes from the first to later measurement cycles. These results indicate that the specimens of Cu-Zr-Al alloys were changing by mechanical relaxation, owing to the motion of atoms or clusters in the glassy state and possible "defects" produced during the processing of alloys.

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The Effect of Melt Treatment on Glass Forming Ability and Thermal Stability of Al‐Based Amorphous Alloy

Zhu

et al. 2010

Adv Eng Mater

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Controlling solidification process, such as melt treatment, including melt superheating temperature (T s ) and the time of homogenization (t h ), as well as casting parameters including mold preheating temperature (T m ) and pouring temperature of the melt (T p ), is widely employed to mediate the microstructures, therefore, the anticipated properties are achieved. [1][2][3][4][5] Amorphous phase is thermodynamically metastable, and significantly dependent on the solidification process. Recently, the glass forming ability (GFA) of the Al-based metallic glasses are greatly improved through a melt treatment during the preparation process, such as the critical size of the amorphous sample were improved from micron to millimeter level for Al-La-Ni alloy [6] and from melt-spun ribbon to as-cast-0.75 mm-diameter rod for Al-Ni-Y alloy. [7] Non-classical nucleation theories [8,9] indicate that the GFA of metallic glass formers is related to the existence of localstructural-ordering clusters and high-melting-temperature phases, which usually act as nucleation sites and grow with little resistance when the temperature reduces upon solidification. The local structural ordering and highmelting-temperature phases are largely influenced by the temperature. [10][11][12] Therefore, the melt treatment is designed as that the alloy is firstly heated to a high temperature, which is about 1.4 times of liquidus temperature (T l ), and then cooled down to a low temperature which is about 100 K higher than T l . Heating the melt to a relatively high temperature is designed for the elimination of the local-structural-ordering clusters and high-melting-temperature phases, which enhances the stabilization of a melt and the GFA. [4] A cooling process is followed to realize a high cooling rate in the melt treatment. However, there are still some problems that are expected to be illustrated. The first point is whether the supposed local-structural-ordering clusters and highmelting-temperature phases mentioned above exist. The second point is whether the melt treatment works on the elimination of local-structural-ordering clusters and highmelting-temperature phases, and improvement of stability of the liquid. The influences of cast temperature on the local-structural-ordering clusters have been investigated by different research groups. [13][14][15][16] In this paper, the possible high-melting-temperature phases will be discussed in detail.In order to detect the possible phases in liquid melt, melt-spinning method is employed to prepare the alloy ribbons due to its extremely high cooling rate, which to some extent reflects the characteristics of the liquid. Alloy ingots with the composition of Al 85.5 Ni 9.5 La 5 (in atomic percentage) were prepared by arc-melting a mixture of high purity metals under a Ti-gettered high purity argon atmosphere in a water-cooled copper hearth. Some amount of the ingots were remelted under high vacuum in a quartz tube, and then injected through a nozzle with a diameter of about 1 mm onto the surface of rotating...

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Topological instability and electronegativity effects on the glass-forming ability of metallic alloys

Cited by 42 publications

References 21 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

Mechanical spectroscopy study of the Cu36Zr59Al5 and Cu54Zr40Al6 amorphous alloys

The Effect of Melt Treatment on Glass Forming Ability and Thermal Stability of Al‐Based Amorphous Alloy

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