Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 33: Structural Materials
MM 33.2: Vortrag
Mittwoch, 13. März 2013, 10:30–10:45, H26
Atom Probe Tomography of Aluminum Lithium Based Alloy — •Muna Khushaim1, Judith Leese2, Torben Boll1, Ferdinand Haider2, and Talaat Al-Kassab1 — 1King Abdullah University of Science and Technology (KAUST), Division of Physical Sciences and Engineering, Thuwal 23955-6900. Saudi Arabia — 2University of Augsburg, Inst. f. Physik, D-86159 Augsburg, Germany
Aluminum alloys exhibiting an improved weight/toughness ratio have been the primary materials for some structural components of aircraft applications. Such alloys can be strengthened through an imposed precipitation by a thermo-mechanical aging treatment. The primary strengthening precipitates T1(Al2CuLi) and other metastable phases such as θ′(Al2Cu) and δ′(Al3Li) are expected to form at different stages of the post heat treatment of the alloy. Hence, an understanding of the distribution of alloying elements and of prestages of precipitation becomes imperative to understand the link between the microstructure and mechanical functionality of the respective alloy. In this study the Laser Assisted Wide Angle Atom Probe Tomography (LAWATAP) was applied to investigate the decomposed microstructure and the possible origins of hardening precipitates in a commercial Al-Li-Cu alloy (AA2195).