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Type van Dalen, Marsha E.; Dunand, David C.; Seidman, David N.
  Publication Nanoscale Precipitation and Mechanical Properties of Al-0.06 at.% Sc Alloys Micro-Alloyed with Yb or Gd Volume Journal Article
Pages 2006
  Abstract Journal of Materials Science  
  Corporate Author  
Publisher 41  
Editor 23
  Summary Language 7814-7823 Series Editor Aluminum alloys; Precipitation; Nucleation; Three-dimensional atom-probe tomography; Rare earth elements; Al-Sc  
Abbreviated Series Title Dilute Al-0.06 at.% Sc alloys with micro-alloying additions of 50 at. ppm of Yb or Gd are studied with 3-D local-electrode atom-probe (LEAP) tomography for different aging times at 300C. Peak-aged alloys exhibit Al3(Sc1-xYbx) or Al3(Sc1-xGdx) precipitates (L12 structure) with a much 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 = 8.0%. 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, precipitate radii are found to be relatively stable up to 24 h of aging, 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 300C is significantly improved by RE microalloying of the binary Al-Sc alloy.
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no NU @ karnesky @ 767
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