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Title Karnesky, Richard A.; Seidman, David N.; Dunand, David C.
Year Creep of Al-Sc Microalloys with Rare-Earth Element Additions
Abbreviated Journal Journal Article
Issue 2006 Keywords Materials Science Forum
Address Mater. Sci. Forum
Thesis 519-521
Place of Publication Language 1035-1040
Original Title Scandium, Rare-Earth Elements, Creep, Precipitation Strengthening; Al-Sc
Series Title Cast and aged Al-Sc microalloys are creep-resistant to 300C, due to the blocking of dislocations by nanosize, coherent Al[sub:3]Sc (L1[sub:2]) 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. Series Volume
Serial Orig Record
ICAA10 no NU @ karnesky @ 660
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