Analysis by synchrotron X-ray radiography of convection effects on the dynamic evolution of the solid–liquid interface and on solute distribution during the initial transient of solidification

Bogno, Abdoul-Aziz; Nguyen-Thi, Henri; Buffet, Adeline; Reinhart, Gunther; Billia, B.; Mangelinck‐Noël, Nathalie; Bergeon, N.; Baruchel, J.; Schenk, Thomas

doi:10.1016/j.actamat.2011.03.059

Cited by 102 publications

(61 citation statements)

References 31 publications

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“…It is usually assumed that the effect of the natural convection in the liquid can be neglected in this case 31,39 . According to Bogno et al 40 , however, even thermal and solutal stabilising configurations can experience strong convection flow in the melt due to transverse gradients. This kind of effect is quite expected for horizontal solidification setup.…”

Section: Cet Positionmentioning

confidence: 99%

The columnar to equiaxed transition of horizontal unsteady-state directionally solidified Al-Si alloys

et al. 2014

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Experiments were conducted to investigate the influence of thermal parameters on the columnar to equiaxed transition during the horizontal unsteady-state directional solidification of Al-Si alloys. The parameters analyzed include the heat transfer coefficients, growth rates, cooling rates, temperature gradients and composition. A combined theoretical and experimental approach is developed to determine the solidification thermal variables considered. The increasing solute content in Al-Si alloys was not found to affect significantly the experimental position of the CET which occurred for cooling rates in the range between 0.35 and 0.64 K/s for any of three alloy compositions examined. A comparative analysis between the results of this work and those from the literature proposed to analyze the CET during upward vertical solidification of Al-Si alloys is reported and the results have shown that the end of the columnar region during horizontal directional solidification is abbreviated as a result of about six times higher thermal gradient than that verified during upward unidirectional solidification of alloys investigated.

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Section: Cet Positionmentioning

confidence: 99%

The columnar to equiaxed transition of horizontal unsteady-state directionally solidified Al-Si alloys

et al. 2014

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“…Fortunately, monitoring of solidification process by synchrotron radiation X-ray radiography has currently reached high time and spatial resolutions, which enables investigating the dynamics of equiaxed growth in metallic alloys in situ and in real-time. [7][8][9] The precise data obtained from such in situ experiments, which enlighten the dynamic phenomena taking place during solidification, are timely to benchmark theoretical models of crystal growth. Accordingly, coupling numerical simulations and in situ experiments on metallic alloy solidification has become the method of choice to analyze growth microstructure formation.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Phase-field Simulation of Dendritic Equiaxed Growth and Comparison with in Situ Observation on Al – 4 wt.% Cu Alloy by Means of Synchrotron X-ray Radiography

Chen

Billia

et al. 2014

ISIJ Int.

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Dendritic equiaxed growth from the melt by continuous cooling-down is investigated by quantitative 2D phase-field simulations. The results are compared with detailed data from solidification experiments on Al-4 wt.% Cu alloy with in situ X-ray monitoring. In a first step, the simulation of an isolated equiaxed alloy dendrite growing freely in <100>-direction in the melt is performed. Then, the impingement between two grains is considered by simulating two dendritic crystals growing towards each other in <100>-direction. From the phase-field simulations, the time evolution of the equiaxed crystals is characterized by measuring the lengths and tip velocities of the primary dendrite arms in free growth and in the presence of neighbor interaction, which enables the analysis of growth dynamics. In a second part, the results of the phase-field simulations are compared to data extracted from an experiment on Al -4 wt.% Cu alloys carried out at the European Synchrotron Radiation Facility (ESRF), with in situ and real-time characterization by means of X-ray radiography, and to analytical relationship for dendrite tip growth. The limitations of 2D-phase-field simulations to fully describe the dynamic formation and interaction of dendritic equiaxed grains are briefly discussed.

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“…[5][6][7] These studies provided considerable information on dendrite growth. However, it is not yet straightforward to directly observe the dynamics of solidification during actual production processes in general.…”

Section: Introductionmentioning

confidence: 99%

Solidification in a Supercomputer: From Crystal Nuclei to Dendrite Assemblages

Shibuta

Ohno

Takaki

2015

JOM

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Thanks to the recent progress in high-performance computational environments, the range of applications of computational metallurgy is expanding rapidly. In this paper, cutting-edge simulations of solidification from atomic to microstructural levels performed on a graphics processing unit (GPU) architecture are introduced with a brief introduction to advances in computational studies on solidification. In particular, million-atom molecular dynamics simulations captured the spontaneous evolution of anisotropy in a solid nucleus in an undercooled melt and homogeneous nucleation without any inducing factor, which is followed by grain growth. At the microstructural level, the quantitative phase-field model has been gaining importance as a powerful tool for predicting solidification microstructures. In this paper, the convergence behavior of simulation results obtained with this model is discussed, in detail. Such convergence ensures the reliability of results of phase-field simulations. Using the quantitative phase-field model, the competitive growth of dendrite assemblages during the directional solidification of a binary alloy bicrystal at the millimeter scale is examined by performing two-and threedimensional large-scale simulations by multi-GPU computation on the supercomputer, TSUBAME2.5. This cutting-edge approach using a GPU supercomputer is opening a new phase in computational metallurgy.

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Analysis by synchrotron X-ray radiography of convection effects on the dynamic evolution of the solid–liquid interface and on solute distribution during the initial transient of solidification

Cited by 102 publications

References 31 publications

The columnar to equiaxed transition of horizontal unsteady-state directionally solidified Al-Si alloys

The columnar to equiaxed transition of horizontal unsteady-state directionally solidified Al-Si alloys

Quantitative Phase-field Simulation of Dendritic Equiaxed Growth and Comparison with in Situ Observation on Al – 4 wt.% Cu Alloy by Means of Synchrotron X-ray Radiography

Solidification in a Supercomputer: From Crystal Nuclei to Dendrite Assemblages

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