Two-Phase Eutectic Growth in Al-Cu and Al-Cu-Ag

  • Oriane Senninger
  • Matthew Peters
  • Peter W. Voorhees
Article
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Abstract

The microstructure developed by two-phase lamellar eutectics \((\alpha )\)\((\theta {\text {-Al}}_{2}{\text {Cu}})\) in Al-Cu and Al-Cu-Ag alloys is analyzed. A model of two-phase eutectic growth in multicomponent alloys is used to determine the scaling law of the eutectic microstructure using the alloy thermophysical properties. The application of the model to these alloys shows that the addition of Ag to Al-Cu alloys does not significantly change the length scale of the microstructure, which is in agreement with previous experimental studies. This is explained by the combined phenomena of the decrease in interface energies with the addition of Ag and the superheating of the \((\alpha )\) phase interface induced by the Ag composition profile.

Notes

Acknowledgments

This work has been supported by the Dow Corning Corporation and by the Center for Hierarchical Materials Design Contract 0NANB14H012 from U.S. Department of Commerce, National Institute of Standards and Technology. We would like to thank Charles-André Gandin and Gildas Guillemot for fruitful discussions.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Oriane Senninger
    • 1
  • Matthew Peters
    • 1
  • Peter W. Voorhees
    • 1
  1. 1.Department of Materials Science and EngineeringNorthwestern UniversityEvanstonUSA

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