Metallurgical and Materials Transactions A

, Volume 38, Issue 7, pp 1452–1457 | Cite as

Characterization of Hypereutectic Al-Si Powders Solidified under Far-From Equilibrium Conditions

  • Y. E. Kalay
  • L. S. Chumbley
  • I. E. Anderson
  • R. E. Napolitano
SYMPOSIUM: Solidification Modeling and Microstructure Formation: In Honor of Prof. John Hunt

The rapid solidification microstructure of gas-atomized Al-Si powders of 15, 18, 25, and 50 wt pct Si were examined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In order of increasing particle size, the powders exhibited microcellular Al, cellular/dendritic Al, eutectic Al, and primary Si growth morphologies. Interface velocity and undercooling were estimated from measured eutectic spacing based on the Trivedi–Magnin–Kurz (TMK) model, permitting a direct comparison with theoretical predictions of solidification morphology. Based on our observations, additional conditions for high-undercooling morphological transitions are proposed as an extension of coupled-zone predictions.

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Copyright information

© THE MINERALS, METALS & MATERIALS SOCIETY and ASM INTERNATIONAL 2007

Authors and Affiliations

  • Y. E. Kalay
    • 1
  • L. S. Chumbley
    • 1
  • I. E. Anderson
    • 1
  • R. E. Napolitano
    • 1
  1. 1.Metal and Ceramic Sciences, Ames Laboratory, United States Department of Energy, and the Department of Materials Science and EngineeringIowa State UniversityAmesUSA

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