Modulated (Spinodal) Alloys

Fındık, Fehim

doi:10.21533/pen.v1i1.16

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…The spinodal decomposition spontaneously occurs and the diffusion process for coarsening will be limited by fast cooling [28]. Moreover, a spinodal structure with a wavelength of about 40–60 nm [30,31], which is very close to our results (about 20 nm), strengthens the alloys effectively, indicating the reason for such a good performance for the as-homogenized sample. In addition, it should be noted that both α and ω nano-precipitates can be observed within the grains, as shown in Figure 8.…”

Section: Resultssupporting

confidence: 82%

Spinodal Decomposition and Mechanical Response of a TiZrNbTa High-Entropy Alloy

et al. 2019

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In this study, the effects of spinodal decomposition on the microstructures and mechanical properties of a TiZrNbTa alloy are investigated. The as-cast TiZrNbTa alloy possesses dual phases of TiZr-rich inter-dendrite (ID) and NbTa-rich dendrite (DR) domains, both of which have a body-centered cubic (BCC) structure. In the DRs of the as-cast alloy, the α and ω precipitates are found to be uniformly distributed. After homogenization at 1100 °C for 24 h followed by water quenching, spinodal decomposition occurs and an interconnected structure with a wavelength of 20 nm is formed. The α and ω precipitates remained in the structure. Such a fine spinodal structure strengthens the alloy effectively. Detailed strengthening calculations were conducted in order to estimate the strengthening contributions from the α and ω precipitates, as well as the spinodal decomposition microstructure.

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Section: Resultssupporting

confidence: 82%

Spinodal Decomposition and Mechanical Response of a TiZrNbTa High-Entropy Alloy

et al. 2019

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“…The composition spread increases with time, and the distribution takes the form of "square wave". [21][22][23] The modulated structure due to spinodal decomposition manifests itself as side bands close to the main Bragg reflections on the XRD pattern. [24,25] That side bands are observed in the XRD pattern of the S2 crystal close to the (00l) reflections.…”

Section: Resultsmentioning

confidence: 99%

“…It is not due to overcoming the nucleation barrier, but it proceeds with an uphill diffusion, which requires finite time. [26] For example, in ternary Cu-based alloys, it proceeds for several months even at elevated temperatures 300-700 K. [23] Figure 3. XRD pattern of the aged single-crystal S2.…”

Section: Resultsmentioning

confidence: 99%

Temporal Spinodal Decomposition of the Fe_1+yTe_1−xSe_x Crystals and its Impact on Superconducting Properties

Gimazov

Kiiamov

Sadakov

et al. 2022

Physica Status Solidi (b)

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Precipitated phases, formed by spinodal decomposition during long‐term storage in a desiccator in dry atmosphere, are found with the X‐ray diffraction (XRD) study of Fe1+y Te1−x Se x crystals. Their compositions are deduced from the position of satellite Bragg reflections in the XRD pattern. In particular, in the Fe1.19Te0.58Se0.42 crystal, traces of phases with significantly higher tellurium content, namely Fe1+y Te0.9Se0.1 and FeTe, are found. The detection and analysis of side bands in the diffraction pattern of an aged crystal indicate spinodal decay. It leads to the formation of a modulated structure in the entire volume of the sample and to strain in the crystal structure. In turn, this results in a significant improvement in the superconducting characteristics. Specifically, the resistive transition narrows to 2 K at the onset temperature 14.5 K, and the superconducting volume fraction increases up to about 100%.

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“…(H) Schematic representation of the spinodal decomposition process as a function of time obtained from Cahn-Hilliard equation (top panel). Image modified from (Findik, 2013). Evolution of irregular condensates in term of its nearest neighbor distance (wavelength), condensate internal concentration (amplitude).…”

Section: Resultsmentioning

confidence: 99%

Molecular Organization of the Early Stages of Nucleosome Phase Separation Visualized by Cryo-Electron Tomography

Zhang

Díaz-Celis

Onoa

et al. 2021

Preprint

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It has been proposed that the intrinsic property of nucleosome arrays to undergo liquid-liquid phase separation (LLPS) in vitro is responsible for chromatin domain organization in vivo. However, understanding nucleosomal LLPS has been hindered by the challenge to characterize the structure of resulting heterogeneous condensates. We used cryo-electron tomography and deep learning-based 3D reconstruction/segmentation to determine the molecular organization of condensates at various stages of LLPS. We show that nucleosomal LLPS involves a two-step process: a spinodal decomposition process yielding irregular condensates, followed by their unfavorable conversion into more compact, spherical nuclei that grow into larger spherical aggregates through accretion of spinodal material or by fusion with other spherical condensates. Histone H1 catalyzes more than 10-fold the spinodal-to-spherical conversion. We propose that this transition involves exposure of nucleosome hydrophobic surfaces resulting in modified inter-nucleosome interactions. These results suggest a physical mechanism by which chromatin may transition from interphase to metaphase structures.

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Modulated (Spinodal) Alloys

Abstract: Abstract:In this work, after defining spinodal reactions experimental investigation on spinodal decomposition are overviewed for the last five decades. Also, future developments in spinodal decomposition for modulated alloys are forecasted and criticized in an outlook.

Cited by 8 publications

References 27 publications

Spinodal Decomposition and Mechanical Response of a TiZrNbTa High-Entropy Alloy

Spinodal Decomposition and Mechanical Response of a TiZrNbTa High-Entropy Alloy

Temporal Spinodal Decomposition of the Fe_1+yTe_1−xSe_x Crystals and its Impact on Superconducting Properties

Molecular Organization of the Early Stages of Nucleosome Phase Separation Visualized by Cryo-Electron Tomography

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Modulated (Spinodal) Alloys

Abstract: Abstract:In this work, after defining spinodal reactions experimental investigation on spinodal decomposition are overviewed for the last five decades. Also, future developments in spinodal decomposition for modulated alloys are forecasted and criticized in an outlook.

Cited by 8 publications

References 27 publications

Spinodal Decomposition and Mechanical Response of a TiZrNbTa High-Entropy Alloy

Spinodal Decomposition and Mechanical Response of a TiZrNbTa High-Entropy Alloy

Temporal Spinodal Decomposition of the Fe1+yTe1−xSex Crystals and its Impact on Superconducting Properties

Molecular Organization of the Early Stages of Nucleosome Phase Separation Visualized by Cryo-Electron Tomography

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Temporal Spinodal Decomposition of the Fe_1+yTe_1−xSe_x Crystals and its Impact on Superconducting Properties