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In Situ X-Ray Observations of Dendritic Fragmentation During Directional Solidification of a Sn-Bi Alloy

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Abstract

Dendrite fragmentation is an important phenomenon in microstructural development during solidification. For instance, it plays a key role in initiating the columnar-to-equiaxed transition (CET). Here, we use x-ray radiography to study dendrite fragmentation rate in a Sn-39.5 wt.% Bi alloy during directional solidification. Experiments were performed in which solidification was parallel and anti-parallel to gravity, leading to significantly different fragmentation rates. We quantify the distribution of fragmentation rate as a function of distance from the solidification front, time in the mushy zone, and volume fraction of solid. While the observed fragmentation rate can be high, there is no evidence of a CET, illustrating that it requires more than just fragmentation to occur.

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Acknowledgements

The authors would like to thank T.V. Beard, R.W. Hudson, B.S. Folks, D.A. Aragon, K.D. Clarke (LANL), and Alex Deriy (APS) for their support with experiment preparations. This research was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under AJC’s Early Career Award. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357 and Los Alamos National Laboratory, operated by Los Alamos National Security, LLC under contract DE-AC52-06NA25396 for the U.S. Department of Energy.

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Authors and Affiliations

  1. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, USA

    John W. Gibbs, Damien Tourret, Paul J. Gibbs, Seth D. Imhoff, Meghan J. Gibbs, Brandon A. Walker & Amy J. Clarke

  2. Advanced Photon Source, Argonne National Laboratory, Lemont, USA

    Kamel Fezzaa

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  1. John W. Gibbs
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Correspondence to John W. Gibbs.

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Gibbs, J.W., Tourret, D., Gibbs, P.J. et al. In Situ X-Ray Observations of Dendritic Fragmentation During Directional Solidification of a Sn-Bi Alloy. JOM 68, 170–177 (2016). https://doi.org/10.1007/s11837-015-1646-7

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  • DOI: https://doi.org/10.1007/s11837-015-1646-7

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