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Karnesky, Richard A.; Seidman, David N.; Dunand, David C. |
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Publication |
Creep of Al-Sc Microalloys with Rare-Earth Element Additions |
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Journal Article |
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2006 |
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Abstract |
Materials Science Forum |
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Corporate Author |
Mater. Sci. Forum |
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519-521 |
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Summary Language |
1035-1040 |
Series Editor |
Scandium, Rare-Earth Elements, Creep, Precipitation Strengthening; Al-Sc |
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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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