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Title: The three-dimensional morphology of growing dendrites

The processes controlling the morphology of dendrites have been of great interest to a wide range of communities, since they are examples of an out-of-equilibrium pattern forming system, there is a clear connection with battery failure processes, and their morphology sets the properties of many metallic alloys. We determine the three-dimensional morphology of free growing metallic dendrites using a novel X-ray tomographic technique that improves the temporal resolution by more than an order of magnitude compared to conventional techniques. These measurements show that the growth morphology of metallic dendrites is surprisingly different from that seen in model systems, the morphology is not self-similar with distance back from the tip, and that this morphology can have an unexpectedly strong influence on solute segregation in castings. These experiments also provide benchmark data that can be used to validate simulations of free dendritic growth.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [2] ;  [4] ;  [1]
  1. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering.
  2. Purdue Univ., West Lafayette, IN (United States). Dept. of Electrical and Computer Engineering.
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Carnegie Mellon University, Pittsburgh, PA (United States). Dept. of Materials Science and Engineering.
Publication Date:
OSTI Identifier:
1214789
Grant/Contract Number:
AC02-06CH11357; FC52-08NA28752
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal Issue: C; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Northwestern Univ., Evanston, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE imaging techniques; phase transitions and critical phenomena