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Type |
Knipling, K. E.; Seidman, D. N.; Dunand, D. C. |
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Publication |
Ambient- and High- Temperature Mechanical Properties of Isochronally Aged Al-0.06Sc, Al-0.06 Zr, and Al-0.06Sc-0.06Zr Alloys (at.%) |
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Journal Article |
Pages |
2011 |
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Abstract |
Acta Materialia |
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59 |
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3 |
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Summary Language |
943-954 |
Series Editor |
Al-Sc; Aluminum alloys; Precipitation; Isochronal heat-treatments; Scandium; Zirconium |
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Abbreviated Series Title |
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 429 MPa peak microhardness at 325 °C. For Al–0.06Zr, precipitation of Al3Zr (L12) first occurs between 400 and 425 °C and reaches a 295 MPa 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 618 MPa 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 7–12 MPa; these values may be further improved by optimal heat-treatments. |
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NU @ karnesky @ |
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10884 |
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