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Ambient- and high-temperature mechanical properties of isochronally aged Al–0.06Sc, Al–0.06Zr and Al–0.06Sc–0.06Zr (at.%) alloys by Keith E. Knipling; David N. Seidman; David C. Dunand is a Engineering article available to read on EtoBox.

What is Ambient- and high-temperature mechanical properties of isochronally aged Al–0.06Sc, Al–0.06Zr and Al–0.06Sc–0.06Zr (at.%) alloys about?

Ambient- and high-temperature precipitation strengthening are investigated in Al–0.06Sc, Al–0.06Zr and Al–0.06Sc–0.06Zr (at.%) alloys. Following solidification, Sc is concentrated at the dendrite peripheries while Zr is segregated at the dendrite cores. During isochronal aging, precipitation of Al3Sc (L12) commences between 250 and 300°C for Al–0.06Sc, and reaches a 429MPa peak microhardness at 325°C. For Al–0.06Zr, precipitation of Al3Zr (L12) first occurs between 400 and 425°C and reaches a 295MPa peak microhardness at 475°C. A pronounced synergistic effect is observed when both Sc and Zr are present. Above 325°C, Zr additions provide a secondary strength increase that is attributed to precipitation of Zr-enriched outer shells onto the Al3Sc precipitates, leading to a peak microhardness of 618MPa at 400°C for Al–0.06Sc–0.06Zr. Upon compressive creep deformation at 300–400°C, Al–0.06Sc–0.06Zr exhibits threshold stresses of 7–12MPa; these values may be further improved by optimal heat-treatments.

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Author

Keith E. Knipling; David N. Seidman; David C. Dunand

Publisher

Elsevier BV

Published

2011

Language

EN

Field

Engineering (Physical Sciences)