Kinetic modification of the ‘confusion principle’ for metallic glass formation

Chattopadhyay, C.; Murty, B.S.

doi:10.1016/j.scriptamat.2016.01.022

Cited by 29 publications

(7 citation statements)

References 16 publications

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“…For the studied compositions, this pseudo-peak can usually be detected in XRD patterns, but even smaller local order areas can be detected by nuclear magnetic resonance spectroscopy [26] or atom probe tomography [46], when not detected with XRD. This somewhat reduced GFA, not always found in Al-RE-Ni systems, could be due to the slightly lower difference between the atomic radius of Al and Y, with respect to other Al-RE pairs (with Sm, Gd, Nd, Ce, Pr, La) [47], therefore resulting in a lower GFA according to the confusion principle [48]. The amorphous structure obtained after melt spinning is confirmed with TEM observations.…”

supporting

confidence: 65%

“…A slightly more stable alloy results when 1 at% Cu replaces Al. Because of the increase in the amount of solute, and just considering the confusion principle [48] (other factors, such as the interaction force among atoms pairs, could also be considered), the reaction maximum is shifted to higher temperatures. On the other hand, when 1 at% Cu replaces Ni, the total amount of solute is the same, but the amorphous structure stability is clearly reduced.…”

Section: Primary Crystallisationmentioning

confidence: 99%

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Crystallisation of amorphous Al-Y-Ni-(Cu) alloys

Cuevas

Lozano-Pérez

Aranda

et al. 2019

Journal of Non-Crystalline Solids

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The nanocrystallisation behaviour and subsequent intermetallics formation of an amorphous Al 88-Y 4-Ni 8 alloy has been studied. A 1 at% of Al or Ni was also substituted by Cu and its effect studied. Differential scanning calorimetry has been used to measure the thermal stability of these amorphous alloys. Transmission electron microscopy showed the smaller size of the nanocrystals obtained during primary crystallisation when Cu is added. Using three-dimensional atom probe, it has been checked that Cu is homogeneously distributed in the amorphous matrix, not contributing to a heterogeneous nucleation around Cu clusters during the formation of nanocrystals. Transmission electron microscopy and X-rays diffraction are used to study the controversial intermetallics occurrence at higher temperatures. The sequence and characteristics of the intermetallics appearing in these alloys were sensitive to the presence of Cu. The evolution of these intermetallics, up to 600 C, has been studied. Findings are compared with previous studies.

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supporting

confidence: 65%

Section: Primary Crystallisationmentioning

confidence: 99%

Crystallisation of amorphous Al-Y-Ni-(Cu) alloys

Cuevas

Lozano-Pérez

Aranda

et al. 2019

Journal of Non-Crystalline Solids

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“…Areas of short range local order, sometimes found in form of a small shoulder in the broad peak in other Al-RE-Ni systems, are not found in the studied materials. The high atomic radius difference between Al and Sm results in a high glass forming ability according to the confusion principle [11]. It is therefore possible to state that ribbons prepared in this work are amorphous, at least at an XRD analysis.…”

Section: Melt-spun Ribbonsmentioning

confidence: 80%

Crystallisation of amorphous Al-Sm-Ni-(Cu) alloys

et al. 2019

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“…Where 1 is the direction cosine of angle between the magnetization vector, M, and the crystallographic [100] axis; 2 the direction cosine between M and the [010] axis 3 the direction cosine between M and the [001] axis. K1 is the 1 st order anisotropy constant and K2 is the 2 nd order anisotropy constant.…”

Section: [4]mentioning

confidence: 99%

“…It has been shown that alloys with the highest density in the liquid have the best GFA, since this results in in higher viscosity and less free volume in the supercooled liquid, which slows crystallization kinetics [96][97][98][99]. Chattopadhyay and Murty showed that for some alloys, the elemental viscosity of additions is a better predictor of GFA than the 3 empirical rules [100].…”

Section: Theories Of Gfamentioning

confidence: 99%