Constance P Lee - Storming Media

Precipitation Evolution in Al-0.1Sc, Al-0.1Zr and Al-0.1Sc-0.1Zr (at.%) Alloys During Isochronal Aging

27 May 2010

14 pages

Authors: Keith E Knipling; Richard A Karnesky; Constance P Lee; David C Dunand; David N Seidman; NAVAL RESEARCH LAB WASHINGTON DC MULTIFUNCTIONAL MATERIALS BRANCH

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Precipitation strengthening is investigated in binary Al-0.1Sc, Al-0.1Zr and ternary Al-0.1-c-0.1Zr (at.%) alloys aged isochronally between 200 and 600 C. Precipitation of Al3Sc (L12) commences between 200 and 250 C in Al-0.1Sc, reaching a 670 MPa peak microhardness at 325 C. For Al-0.1Zr, precipitation of Al3Zr (L12) initiates between 350 and 375 C, resulting in a 420 MPa peak microhardness at 425-450 C. A pronounced synergistic effect is observed when ...