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Time resolved X-ray imaging of eutectic cellular patterns evolving during solidification of ternary Al–Cu–Ag alloys

  • Gerhard Zimmermann , Ulrike Hecht , Michael Mathes and Ragnvald H. Mathiesen
Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 101 Issue 12

Abstract

Synchrotron radiography has enabled time and space resolved investigation of directional solidification of ternary AlüCuüAg eutectic. Due to a high spatial resolution the lamellar spacing of the eutectic can be identified. The morphological instability of a planar eutectic solidüliquid interface towards eutectic cells observed in sheet-like samples is investigated for different solidification conditions. The results are summarized in a stability diagram and compared to findings in bulk samples and theoretical predictions based on the criterion of constitutional undercooling. During growth of eutectic cells an intriguing dual phase fragmentation in the intercolumnar/cellular regions with Al2Cu fragments settling and Al-rich fragments rising in the melt was observed, which may be unique for coupled growth of multicomponent eutectics.

Keywords: Eutectic solidification; Synchrotron radiation; Aluminium alloys; Cellular growth; Fragmentation
* Correspondence address, Dr. Gerhard Zimmermann, ACCESS e.V., Intzestraβe 5, 52072 Aachen, Germany. Tel.: +49 241 8098 005, Fax: +49 241 38578. E-mail:

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Received: 2009-12-3
Accepted: 2010-10-4
Published Online: 2013-06-11
Published in Print: 2010-12-01

© 2010, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110435
Keywords for this article
Eutectic solidification; Synchrotron radiation; Aluminium alloys; Cellular growth; Fragmentation

Articles in the same Issue

  1. Basic
  2. High-temperature in-situ microscopy during stress-induced phase transformations in Co49Ni21Ga30 shape memory alloy single crystals
  3. Contents
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  9. Experimental investigation of the Zn–Fe–V system at 450°C
  10. Time resolved X-ray imaging of eutectic cellular patterns evolving during solidification of ternary Al–Cu–Ag alloys
  11. Reassessment of the Mg–Ge binary system using CALPHAD supported by first-principles calculation
  12. A quantitative modeling of the unloading behavior of metals during a tensile test
  13. A technique for diameter enlargement in SiC crystal growth
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