Convection Effects During Bulk Transparent Alloy Solidification in DECLIC-DSI and Phase-Field Simulations in Diffusive Conditions

Mota, F.L.; Song, Younggil; Pereda, Jorge; Billia, B.; Tourret, Damien; Debierre, Jean–Marc; Trivedi, R.; Bergeon, N.

doi:10.1007/s11837-017-2395-6

Cited by 8 publications

(5 citation statements)

References 45 publications

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“…Transparency of the crucible also permits transversal imaging, thus providing both side view and top view images of the solidifying microstructure. More details on the DECLIC-DSI setup and experiments can be found elsewhere [19,22,30,32,33,34,35,36].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Thermal-field effects on interface dynamics and microstructure selection during alloy directional solidification

et al. 2018

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We carry out three-dimensional phase-field simulations to model unique experimental observations of cellular and dendritic solidification structures formed under diffusive growth conditions in the DSI (Directional Solidification Insert) of the DECLIC (DEvice for the study of Critical LIquids and Crystallization) aboard the International Space Station. We had previously shown experimentally that complex thermal conditions affect the stationary position of the solid-liquid interface, as well as its dynamics of relaxation towards this stationary position over a finite time after the onset of sample pulling. Here, we discuss the effects of thermal diffusion within the adiabatic zone of the directional solidification setup and of latent heat release at the solid-liquid interface by means of quantitative phase-field simulations. Simulations and experiments characterize the entire evolution of the primary spacing of cellular/dendritic array structures from the onset of morphological instability to the establishment of the final steady-state spacing, including the transient coarsening regime associated with a sharp increase of spacing. Accounting for these thermal effects leads to a major improvement in the agreement between simulations and microgravity measurements for both the time of occurrence of morphological instability after the start of the experiment and the subsequent spacing evolution, which are not accurately predicted using the standard frozen temperature approximation.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Thermal-field effects on interface dynamics and microstructure selection during alloy directional solidification

et al. 2018

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“…The main problem with studying bulk samples comes from the presence of significant convection in the melt. Fluid flow modifies the structure of the solute boundary layer by sweeping, thus causing non-uniform morphological instability with the formation of a nonuniform microstructure and non-uniform primary spacing [19,[22][23][24][25][26]. The easiest way to avoid or drastically reduce convection is to reduce the size of the samples.…”

Section: Introductionmentioning

confidence: 99%

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

Mota

Littles

et al. 2023

Acta Materialia

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“…For example, a tip-splitting may propagate step-by-step to reduce the spacing after a velocity jump [7] or a local change of spacing induced by an elimination is distributed over neighboring cells by lateral motions [8]. In a large real sample, variations or heterogeneities of spacing do not only come from the extent of the band of stable spacings: they may result from macroscopic defects such as interface curvature [18,19], presence of convection effects [20][21][22][23][24], or presence of several grains associated to different growth directions [25][26][27][28][29]. Moreover, in case of misorientation, the pattern is travelling due to the tilt of the growth direction [29,30], thus inducing a process of source and sink of structures; the source may emit structures of spacing different than the average intra-grain spacing and it was recently demonstrated that in that case, a propagative mechanism of spacing selection then operates on large space and time scales [31].…”

Section: Introductionmentioning

confidence: 99%

Effect of sub-boundaries on primary spacing dynamics during 3D directional solidification conducted on DECLIC-DSI

Mota

Pereda

et al. 2021

Acta Materialia

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To characterize the dynamical formation of three-dimensional (3D) arrays of cells and dendrites under diffusive growth conditions, in situ monitoring of a series of experiments on a transparent succinonitrile -0.24 wt% camphor model alloy was carried out under low gravity in the DECLIC Directional Solidification Insert onboard the International Space Station. The continuous interface observation enables to construct space-time evolution maps of cell location and primary spacing. Both convergent and divergent sub-boundaries are identified and new insights on their effects on the spatiotemporal evolution of the pattern are thus evidenced. 3D phase-field simulations that reproduce the experimental sub-boundary configurations are performed to support the analyses. Even for the low angle sub-boundaries studied, the primary spacing increases or decreases in the vicinity of the boundary respectively for divergent and convergent sub-boundary. This effect may extend on a long distance within the different sub-grains and its magnitude depends on the average primary spacing and its positioning relative to the limits of the stability band. On the sample scale, the primary spacing profile is also influenced by the presence of sources and sinks at the crucible wall due to the pattern drift. Their type and distance from the sub-boundaries give rise to complex spatial distributions of primary spacing over the entire sample.

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Convection Effects During Bulk Transparent Alloy Solidification in DECLIC-DSI and Phase-Field Simulations in Diffusive Conditions

Cited by 8 publications

References 45 publications

Thermal-field effects on interface dynamics and microstructure selection during alloy directional solidification

Thermal-field effects on interface dynamics and microstructure selection during alloy directional solidification

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

Effect of sub-boundaries on primary spacing dynamics during 3D directional solidification conducted on DECLIC-DSI

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