Coarsening evolution of dendritic sidearms: From synchrotron experiments to quantitative modeling
Source abstract
Abstract
Abstract The local dynamics of dendritic sidearms during coarsening are studied by combining in-situ radiography observations with numerical and analytical models. A flat sample of a Ga-In alloy is partially solidified and then held isothermally in a vertical temperature gradient. The evolving dendritic microstructure is visualized using synchrotron X-ray imaging at the BM20 (ROBL) beamline at ESRF, France. During the coarsening stage, the temporal evolution of the geometrical features of sidebranches is captured by automated image processing. This data is then used to quantify the dynamics of two basic evolution mechanisms for sidebranches: retraction and pinch-off. The universal dynamics of sidearm necks during pinch-off are exploited to determine the product of liquid diffusivity and capillarity length D d 0 , as a parameter that is crucial in the calibration of quantitative models. By employing an idealized phase-field model for the evolution of a single sidebranch, the behavior of selected sidebranches is reproduced from the experiments in a consistent way.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Solidification and crystal growth phenomena · Aluminum Alloy Microstructure Properties · Microstructure and Mechanical Properties of Steels
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (25)
Show source-provided references
1. On the interest of synchrotron X-ray imaging for the study of solidification in metallic alloys
2. Time resolved X-ray imaging of dendritic growth in binary alloys10.1103/PhysRevLett.83.5062 ↗
3. The evolution of interfacial morphology during coarsening: a comparison between 4D experiments and phase-field simulations10.1016/j.scriptamat.2010.10.040 ↗
4. In situ and real-time 3-D microtomography investigation of dendritic solidification in an Al-10 wt.% Cu alloy10.1016/j.actamat.2009.01.035 ↗
5. Coarsening mechanisms in a dendritic Al–10% Cu alloy10.1016/j.actamat.2009.08.052 ↗
6. Fast synchrotron X-ray tomographic quantification of dendrite evolution during the solidification of Mg-Sn alloys10.1016/j.actamat.2016.07.047 ↗
7. In situ X-Ray observations of dendritic fragmentation during directional solidification of a Sn-Bi alloy10.1007/s11837-015-1646-7 ↗
8. In situ observations of dendritic fragmentation due to local solute-enrichment during directional solidification of an aluminum alloy10.1016/j.actamat.2007.03.030 ↗
9. Observation of dendritic growth and fragmentation in Ga-In alloys by X-ray radioscopy10.1179/136404609X367263 ↗
10. Fragmentation-driven grain refinement in directional solidification of AlCu10wt-% alloy at low pulling speeds10.1016/j.actamat.2016.12.063 ↗
11. In-Situ and real-time analysis of the formation of strains and microstructure defects during solidification of Al-3.5 wt pct Ni alloys10.1007/s11661-007-9449-2 ↗
12. Necessity of investigating microstructure formation during directional solidification of transparent alloys in 3D10.1016/j.asr.2005.02.092 ↗
13. Pinch-off of rods by bulk diffusion10.1016/j.actamat.2011.04.036 ↗
14. Dendrite fragmentation in alloy solidification due to sidearm pinch-off10.1103/PhysRevE.92.060401 ↗
15. X-ray radioscopic visualization of the solutal convection during solidification of a Ga-30 wt pct in alloy10.1007/s11661-007-9462-5 ↗
16. Chimney formation in solidifying Ga-25wt pct in alloys under the influence of thermosolutal melt convection10.1007/s11661-013-1711-1 ↗
17. The Ga–In(gallium–indium) system10.1007/BF02663677 ↗
18. Surface free energies of solid metals: estimation from liquid surface tension measurements10.1016/0039-6028(77)90442-3 ↗
19. Determination of diffusion coefficients and activity rates for gallium-indium system by contact melting method
20. General evolution equation for the specific interface area of dendrites during alloy solidification10.1016/j.actamat.2017.08.021 ↗
21. Model for isothermal dendritic coarsening10.1016/0036-9748(71)90013-5 ↗
22. Determining material parameters using phase-field simulations and experiments10.1016/j.actamat.2017.02.056 ↗
23. Simulation of convection and ripening in a binary alloy mush using the phase-field method10.1016/S1359-6454(99)00239-6 ↗
24. Dantzig · 2009
25. Gale · 2003