Regensburg 2013 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 33: Structural Materials

MM 33.2: Talk

Wednesday, March 13, 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).