In situ observations by synchrotron white beam X-ray topography of the solidification microstructures of an Al-0.73 wt% Cu alloy

Grange, G.; Gastaldi, J.; Jourdan, C.; Marzo, P.; Billia, B.

doi:10.1016/0022-0248(92)90141-5

Cited by 12 publications

(5 citation statements)

References 20 publications

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“…Miller and Beech were among the first [358] to publish, in 1972, radiographic images of equiaxed dendrites solidifying in an Al–Cu alloy. The technique was later improved [359] and, using synchrotrons with high coherence and beam brilliance [360], high-resolution in-situ real-time images could be produced [361,362].…”

Section: Ect and Cetmentioning

confidence: 99%

Progress in modelling solidification microstructures in metals and alloys: dendrites and cells from 1700 to 2000

Kurz

Fisher

Trivedi

2018

International Materials Reviews

152

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This is the first account of the history of our understanding of, and ability to model, solidification microstructures. Its objective is to retrace the scientific steps made, from the earliest observations of the eighteenth century to our present-day understanding of dendrites and eutectics. Because of the abundance of information, especially that added during the present century, sub-division was essential: this being the first of three articles. They cover dendrites and cells from 1700 to 2000, and then from 2001 to 2015 and finally eutectics and peritectics from 1700 to 2015. The authors have striven always to identify the genesis of every advance made, being aware that such a compact history must leave many worthy contributions by the wayside; others will doubtless complete the history. This review shows how crossfertilisation between theory and experiment, and basic and applied research led to both the posing and answering of challenging fundamental questions, thus rewarding society with beneficial results.

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Section: Ect and Cetmentioning

confidence: 99%

Progress in modelling solidification microstructures in metals and alloys: dendrites and cells from 1700 to 2000

Kurz

Fisher

Trivedi

2018

International Materials Reviews

152

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“…The experimentally reported values of D L from non-solidification experiments for Pb–Sn alloys at different concentrations are reported in [ 18 ] and are summarized in Table 1 . The experimental D L values shown in Table 1 directly measured from non-solidification experiments are corrected by an Arrhenius-type correction for the liquidus temperature if the report is at a higher temperature than the liquidus [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ]. However, note that these corrected numbers only impact the results in a minor way for the dilute alloy compositions considered.…”

Section: Comparison With Experiments For the Diffusion Coefficientmentioning

confidence: 99%

“…However, even with the MEPR model, large deviations are noted for experimental conditions with a small temperature gradient. Pb–Sn alloys are known to have very wide diffuse interfaces [ 1 , 21 , 35 , 36 , 37 ]. A lower G SLI dramatically influences the diffuse interface as noted above, and consequently the partition coefficient.…”

Section: Comparison With Experiments For the Diffusion Coefficientmentioning

confidence: 99%

“…The appearance of a smooth-cellular or jagged morphology from a planar interface, especially for binary alloys, depends on the material composition, C O (wt% or mole/m 3 ), velocity V (m/s) of the growing interface, and the temperature gradient G L (K/m) in the liquid and k, the non-dimensional solute partition coefficient. These variables at the point of morphological instability are commonly subscripted with the symbol (c) to indicate a transition [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. Various theoretical models [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ] have been offered to explain the transition, however, the two most widely employed models (prior to MEPR) that describe the interface instability from planar to non-planar are the constitutional undercooling (CUT) [ 19 , 20 , 21 , 22 , 27 ] and the linear stability theory model (LST) […”

Section: Introductionmentioning

confidence: 99%

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Solidification Morphology and Bifurcation Predictions with the Maximum Entropy Production Rate Model

Bensah

Sekhar

2019

Entropy

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The use of the principle of maximum entropy generation per unit volume is a new approach in materials science that has implications for understanding the morphological evolution during solid–liquid interface growth, including bifurcations with or without diffuseness. A review based on a pre-publication arXiv preprint is first presented. A detailed comparison with experimental observations indicates that the Maximum Entropy Production Rate-density model (MEPR) can correctly predict bifurcations for dilute alloys during solidification. The model predicts a critical diffuseness of the interface at which a plane-front or any other form of diffuse interface will become unstable. A further confidence test for the model is offered in this article by comparing the predicted liquid diffusion coefficients to those obtained experimentally. A comparison of the experimentally determined solute diffusion constant in dilute binary Pb–Sn alloys with those predicted by the various solidification instability models (1953–2011) is additionally discussed. A good predictability is noted for the MEPR model when the interface diffuseness is small. In comparison, the more traditional interface break-down models have low predictiveness.

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“…[48] Based on Cikawa's TV system Grange et al analyzed the dislocation behavior in pure Al during melting and solidification, respectively [49] and found later that dislocations play no critical role for the formation of growth cells in Al-Ni alloys. [50] But it became obvious, that radiography and related phase contrast methods are better suited to observe the interface morphology and dynamics. Billia et al analyzed by means of in situ radiography the effect of convection on the morphological stability and the formation of growth cells, dendrites and defects in Al-Ni alloys.…”

Section: Introductionmentioning

confidence: 99%

X‐Ray Topography—More than Nice Pictures

Danilewsky

2020

Crystal Research and Technology

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X‐ray topography—a well‐known diffraction imaging method—is widely used for the characterization of extended crystal defects like dislocations. Herein, the progress toward the quantification besides the number and nature of dislocations is given. The diffracted images include additional information about tilt and strain, which can be measured in real‐time, thanks to the improved digital detection systems. This allows not only the fast mapping of huge samples like 450 mm diameter Si wafers, the in situ observation of the dislocation, or crack dynamics at high temperatures, but also the stress analysis in electronic devices in operando. In addition to typical white X‐ray beam methods like stacks of section topographs, the monochromatic diffraction laminography allows a 3D representation of the dislocation arrays. The merits and limitations of X‐ray topography are demonstrated by semiconductor materials as an example.

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In situ observations by synchrotron white beam X-ray topography of the solidification microstructures of an Al-0.73 wt% Cu alloy

Cited by 12 publications

References 20 publications

Progress in modelling solidification microstructures in metals and alloys: dendrites and cells from 1700 to 2000

Progress in modelling solidification microstructures in metals and alloys: dendrites and cells from 1700 to 2000

Solidification Morphology and Bifurcation Predictions with the Maximum Entropy Production Rate Model

X‐Ray Topography—More than Nice Pictures

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