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Effect of Fe-Rich Intermetallics on Tensile Behavior of Al–Cu 206 Cast Alloys at Solid and Near-Solid States

  • K. LiuEmail author
  • X. Cao
  • A. Bolouri
  • X.-G. Chen
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Iron is one of the most common impurity elements in Al–Cu 206 cast alloys as it often causes the precipitation of Fe-rich intermetallic phases during solidification due to its extremely low solid solubility in aluminum. The characteristics of the Fe-rich intermetallics, such as type, morphology, size, and distribution, have significant influences on the tensile behaviors of the Al alloys. In the present work, two Al–Cu 206 cast alloys containing different types of Fe-rich intermetallics (dominated by either platelet β-Fe or Chinese script α-Fe) were cast and their tensile tests were performed at both solid (room temperature) and near-solid (2.8 vol. % liquid) states. It is found that the tensile properties in both solid and near-solid states are improved when the Fe-rich intermetallics change from platelet to Chinese script morphologies. During the solid-state tensile deformation, the failure occurs mainly along the platelet β-Fe intermetallics/Al matrix interface or within the Chinese script α-Fe particles. In the near-solid state, the alloy containing mainly Chinese script α-Fe is found to have more free flow paths for liquid feeding, leading to improved tensile properties. By contrast, the platelet β-Fe can cause the blockage of the liquid flow paths, leading to the degraded tensile properties and worsened susceptibility to hot-tearing.

Keywords

Al–Cu alloy Fe-rich intermetallics Tensile properties Solid and near-solid state Hot-tearing 

Notes

Acknowledgements

The authors would like to acknowledge the financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC) and Rio Tinto Aluminum, through the NSERC Industry Research Chair in Metallurgy of Aluminum Transformation at the University of Quebec at Chicoutimi, and support of National Research Council of Canada.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Department of Applied ScienceUniversity of Quebec at ChicoutimiChicoutimiCanada
  2. 2.Aerospace Manufacturing Technology Center, National Research Council CanadaMontrealCanada
  3. 3.Department of Engineering Design and MathematicsUniversity of the West of EnglandBristolUK

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