Influence of macroscopic interface curvature on dendritic patterns during directional solidification of bulk samples: Experimental and phase-field studies

Mota, F.L.; Ji, Kaihua; Littles, L Strutzenberg; Trivedi, R.; Bergeon, N.

doi:10.1016/j.actamat.2023.118849

Cited by 10 publications

(4 citation statements)

References 58 publications

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“…For example, the DSI experiments analysis revealed the complex thermal field evolution in bulk samples and its consequences on solidification patterns 11 , thus leading to the development of a phase field coupled with thermal calculations to improve simulation accuracy 12 . Experiments especially highlighted the major influence of interface curvature, subboundaries and pattern misorientations which are unavoidable in 3D growth, thus supporting numerical simulations to include such defects 13,14 . Experiments performed on DECLIC-DSI also led to unprecedented observations that have been analyzed with the support of 3D phase-field numerical simulations.…”

Section: Introductionsupporting

confidence: 52%

Solidification furnace for in situ observation of bulk transparent systems and image analysis methods

Mota

Medjkoune

Littles

et al. 2023

Review of Scientific Instruments

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This paper aims to describe the experimental framework of the Directional Solidification Insert, installed onboard the International Space Station, dedicated to the in situ and real-time characterization of the dynamic selection of the solid–liquid interface morphology in bulk samples of transparent materials under diffusive growth conditions. The in situ observation of the solid–liquid interface is an invaluable tool for gaining knowledge on the time evolution of the interface pattern because the initial morphological instability evolves nonlinearly and undergoes a reorganization process. The result of each experiment, characterized by the sample concentration, a thermal gradient, and a pulling rate, is a large number of images. The interpretation of these images necessitates a robust identification of each cell/dendrite’s position and size during the entire solidification. Several image analysis methods have been developed to reliably achieve this goal despite varying contrast and noise levels and are described in detail. Typical solidification experiments are presented, and the dynamics of the pattern formation are analyzed to illustrate the application of the image analysis methods.

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Section: Introductionsupporting

confidence: 52%

Solidification furnace for in situ observation of bulk transparent systems and image analysis methods

Mota

Medjkoune

Littles

et al. 2023

Review of Scientific Instruments

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“…In this example, a major effect of the macroscopic interface curvature on the primary spacing was identified (Fig. 2d ) 89 . Such a macroscopic curvature tended to induce a radial drift of the pattern, which the anisotropic growth of dendrites resists.…”

Section: Reviewmentioning

confidence: 79%

“… In situ directional solidification of a SCN-0.46 wt% DC alloy (V = 1.5 μms −1 ; G = 12 Kcm −1 ) under microgravity (DECLIC-DSI). Raw images ( a ) are analyzed to determine each dendrite center and to build Voronoi skeletons ( b ) that are used to calculate local spacings (scale in µm) and draw maps of primary spacing ( c ) 89 . Color online.…”

Section: Reviewmentioning

confidence: 99%

Microgravity studies of solidification patterns in model transparent alloys onboard the International Space Station

Akamatsu,

Bottin-Rousseau,

Witusiewicz

et al. 2023

npj Microgravity

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We review recent in situ solidification experiments using nonfaceted model transparent alloys in science-in-microgravity facilities onboard the International Space Station (ISS), namely the Transparent Alloys (TA) apparatus and the Directional Solidification Insert of the DEvice for the study of Critical Liquids and Crystallization (DECLIC-DSI). These directional-solidification devices use innovative optical videomicroscopy imaging techniques to observe the spatiotemporal dynamics of solidification patterns in real time in large samples. In contrast to laboratory conditions on ground, microgravity guarantees the absence or a reduction of convective motion in the liquid, thus ensuring a purely diffusion-controlled growth of the crystalline solid(s). This makes it possible to perform a direct theoretical analysis of the formation process of solidification microstructures with comparisons to quantitative numerical simulations. Important questions that concern multiphase growth patterns in eutectic and peritectic alloys on the one hand and single-phased, cellular and dendritic structures on the other hand have been addressed, and unprecedented results have been obtained. Complex self-organizing phenomena during steady-state and transient coupled growth in eutectics and peritectics, interfacial-anisotropy effects in cellular arrays, and promising insights into the columnar-to-equiaxed transition are highlighted.

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“…For all translation velocities, lamellae are thickest in the outer region of the samples and a decrease in thickness is observed with decreasing distance from the center (e.g., for samples solidified at V = 6.5 μm s −1 , lamellae thickness at the outer and inner regions is 74 ± 30 and 36 ± 15 μm, respectively; for V = 80 μm s −1 , these values decrease to 45 ± 23 and 19 ± 10 μm, respectively). This trend-increasing lamellar thickness at outer/peripheral regions of samples relative to inner/central regions-indicates that the local solidification velocity is higher in the central region of the sample relative to the outer region, which is suggestive of macroscopic curvature of the interface during solidification and corresponding convective fluid motion [25]. Similar observations were described in our previous study investigating directional solidification of aqueous TiO 2 suspensions [22,26] solidified in a buoyancy unstable configuration (which for water, is vertically upward), wherein a macroscopic curvature of the solid/liquid interface was proposed to explain radial variation in particle wall width (dependent on distance from the center) and banding (solidified fluid, separated by particle-packed regions, and oriented perpendicular to the solidification direction) present in the central regions of samples.…”

Section: Radial Segregationmentioning

confidence: 93%

Lamellar structures in directionally solidified naphthalene suspensions

Scotti,

Voorhees,

Dunand

2024

Journal of Materials Research

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To investigate naphthalene as a suspending fluid for freeze-casting applications, sterically stabilized suspensions of copper microparticles suspended in liquid naphthalene are directionally solidified in a Bridgman furnace. Colonies of nearly particle-free naphthalene lamellae, interspersed with particle-enriched interlamellar regions, are predominantly aligned in the direction of the imposed thermal gradient. As furnace translation velocities decrease from 80 to 6.5 μm s−1, the thickness of naphthalene lamellae increases. For the lowest velocity, a transition to a lensing microstructure (with naphthalene bands aligned perpendicular to the solidification direction) is observed in central regions of samples. For all velocities, the naphthalene lamellae show (i) secondary dendritic arms on one of their sides and (ii) are thinnest within core regions relative to peripheral regions (closest to the crucible walls). Together, these observations suggest the presence of buoyancy-driven convection during solidification. Graphical Abstract

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Influence of macroscopic interface curvature on dendritic patterns during directional solidification of bulk samples: Experimental and phase-field studies

Cited by 10 publications

References 58 publications

Solidification furnace for in situ observation of bulk transparent systems and image analysis methods

Solidification furnace for in situ observation of bulk transparent systems and image analysis methods

Microgravity studies of solidification patterns in model transparent alloys onboard the International Space Station

Lamellar structures in directionally solidified naphthalene suspensions

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