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Journal of Materials Science

, Volume 41, Issue 23, pp 7814–7823 | Cite as

Nanoscale precipitation and mechanical properties of Al-0.06 at.% Sc alloys microalloyed with Yb or Gd

  • Marsha E. van Dalen
  • David C. Dunand
  • David N. Seidman
Article

Abstract

Dilute Al-0.06 at.% Sc alloys with microalloying additions of 50 at. ppm of ytterbium (Yb) or gadolinium (Gd) are studied with 3D local-electrode atom-probe (LEAP) tomography for different aging times at 300 °C. Peak-aged alloys exhibit Al3(Sc1−xYbx) or Al3(Sc1−xGdx) precipitates (L12 structure) with a higher number density (and therefore higher peak hardness) than a binary Al-0.06 at.% Sc alloy. The Al–Sc–Gd alloy exhibits a higher number density of precipitates with a smaller average radius than the Al–Sc–Yb alloy, leading to a higher hardness. In the Al–Sc–Gd alloy, only a small amount of the Sc is replaced by Gd in the Al3(Sc1−xGdx) precipitates, where x = 0.08. By contrast, the hardness incubation time is significantly shorter in the Al–Sc–Yb alloy, due to the formation of Yb-rich Al3(Yb1−xScx) precipitates to which Sc subsequently diffuses, eventually forming Sc-rich Al3(Sc1−xYbx) precipitates. For both alloys, the precipitate radii are found to be almost constant to an aging time of 24 h, although the concentration and distribution of the RE elements in the precipitates continues to evolve temporally. Similar to microhardness at ambient temperature, the creep resistance at 300 °C is significantly improved by RE microalloying of the binary Al-0.06 at.% Sc alloy.

Keywords

Aging Time Threshold Stress Al3Sc Peak Hardness High Number Density 

Notes

Acknowledgements

This research was supported by the United States Department of Energy through grant DE-FG02–98ER45721. Atom-probe tomographic measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT), using a LEAP tomograph purchased with funding from the NSF-MRI (DMR-0420532, Dr. Charles Bouldin monitor) and ONR-DURIP (N00014–0400798, Dr. Julie Christodoulou monitor) programs. The authors thank Richard Karnesky and Keith Knipling (Northwestern University) for helpful discussions.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Marsha E. van Dalen
    • 1
  • David C. Dunand
    • 1
  • David N. Seidman
    • 1
    • 2
  1. 1.Department of Materials Science and EngineeringNorthwestern UniversityEvanstonUSA
  2. 2.Northwestern University Center for Atom-Probe Tomography (NUCAPT)EvanstonUSA

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