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Cryogenic and elevated temperature strengths of an Al−Zn−Mg−Cu alloy modified with Sc and Zr

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Abstract

The effect of minor additions of Sc and Zr on tensile properties of two developmental Al−Zn−Mg−Cu alloys was studied in the temperature range −196°C to 300°C. Due to the presence of Sc and Zr in a fine dispersoid form, both low-temperature and elevated temperature strengths of these alloys are much higher than those of similar 7000 series alloys that do not contain these elements. After short holding times (up to 10 hours) at 205°C, the strength of these alloys is higher than those of high-temperature Al alloys 2219-T6 and 2618-T6; however, the latter alloys show better strength after longer holding times. It is suggested that additional alloying of the Sc-containing Al−Zn−Mg−Cu alloys with other dispersoid-forming elements, such as Ni, Fe, Mn, and Si, with a respective decrease in the amounts of Zn and Mg may further improve the elevated temperature strength and decrease the loss of strength with extended elevated temperature exposure.

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Authors and Affiliations

  1. UES, Inc., 15432, Dayton, OH

    S. V. Senkova (Materials Scientist) & O. N. Senkov (Senior Scientist)

  2. Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson AFB, 45433-7817, OH

    D. B. Miracle (Senior Scientist and Group Leader)

Authors
  1. S. V. Senkova
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  2. O. N. Senkov
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  3. D. B. Miracle
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Senkova, S.V., Senkov, O.N. & Miracle, D.B. Cryogenic and elevated temperature strengths of an Al−Zn−Mg−Cu alloy modified with Sc and Zr. Metall Mater Trans A 37, 3569–3575 (2006). https://doi.org/10.1007/s11661-006-1051-5

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  • DOI: https://doi.org/10.1007/s11661-006-1051-5

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