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Type Karnesky, Richard A.; Seidman, David N.; Dunand, David C.
  Publication Creep of Al-Sc Microalloys with Rare-Earth Element Additions Volume Journal Article
Pages 2006
  Abstract Materials Science Forum  
  Corporate Author Mater. Sci. Forum  
Publisher 519-521  
Editor
  Summary Language 1035-1040 Series Editor Scandium, Rare-Earth Elements, Creep, Precipitation Strengthening; Al-Sc  
Abbreviated Series Title Cast and aged Al-Sc microalloys are creep-resistant to 300C, due to the blocking of dislocations by nanosize, coherent Al3Sc (L12) precipitates. Rare-earth elements substitute for Sc in these precipitates, leading to a higher number density of smaller precipitates, which have a greater lattice-parameter mismatch with Al than in the Al-Sc binary microalloy. This leads to an improvement in both ambient temperature microhardness and high temperature creep. Creep threshold stresses of Al-Sc-RE (RE = Y, Dy, or Er) at 300C; are higher than for Al-Sc and Al-Sc-M (M = Mg, Ti, or Zr) microalloys. This is in agreement with a dislocation climb model that includes the elastic stress fields of the precipitates.
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ICAA10 no NU @ karnesky @ 660
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