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Benchmark microgravity experiments and computations for 3D dendritic-array stability in directional solidification

Journal Article · · Acta Materialia
 [1];  [2];  [1];  [2];  [3];  [4];  [2];  [1]
  1. Aix Marseille University (France)
  2. Northeastern University, Boston, MA (United States)
  3. Northeastern University, Boston, MA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  4. NASA Marshall Space Flight Center (MSFC), Huntsville, AL (United States)

In this study, we present a comprehensive quantitative analysis of stability bands for dendritic arrays during directional solidification of a transparent succinonitrile-0.46 wt % camphor alloy, spanning a broad range of pulling velocities. Taking advantage of the microgravity environment aboard the International Space Station where most convection effects are suppressed, we obtain unique measurements that quantify the stable primary spacing range of spatially extended three-dimensional dendritic array structures under purely diffusive growth conditions. Through carefully designed velocity jump experiments and detailed examination of sub-grain boundary dynamics, we characterize key instabilities, including elimination and tertiary branching, shedding new light on the mechanisms governing dynamic dendritic spacing selection in extended 3D arrays. Phase field simulations are performed to characterize the stability limits of dendritic array structures for quantitative comparison with the flight experiments. Although the simulations capture general trends, significant deviations are noted at the upper stability boundary, indicating the influence of additional, unexplored factors. These findings contribute to a deeper understanding of dendritic growth dynamics and offer valuable benchmark data that could aid in refining predictive models and improving control of dendritic microstructures in metallurgical applications.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA); French Space Agency (CNES)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
2555944
Report Number(s):
LLNL--JRNL-2001408
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 292; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (19)


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