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Creep- and coarsening properties of Al–0.06 at.% Sc–0.06 at.% Ti at 300–450 °C

✍ Scribed by Marsha E. van Dalen; David N. Seidman; David C. Dunand

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
445 KB
Volume
56
Category
Article
ISSN
1359-6454

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✦ Synopsis

Upon aging at 300-450 °C, nanosize, coherent Al 3 (Sc 1Àx Ti x ) precipitates are formed in pure aluminum micro-alloyed with 0.06 at.% Sc and 0.06 at.% Ti. The outstanding coarsening resistance of these precipitates at these elevated temperatures (61-77% of the melting temperature of aluminum) is explained by the significantly smaller diffusivity of Ti in Al when compared to that of Sc in Al. Furthermore, this coarse-grained alloy exhibits good compressive creep resistance for a castable, heat-treatable aluminum alloy: the creep threshold stress varies from 17 MPa at 300 °C to 7 MPa at 425 °C, as expected if the climb bypass by dislocations of the mismatching precipitates is hindered by their elastic stress fields.

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