Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 16: Microstructure and Phase Transformations III - Precipitaion hardening/ Alloying elements
MM 16.1: Vortrag
Montag, 31. März 2014, 15:45–16:00, IFW B
Atom Probe Tomography Analyses of Precipitation in the AA2195 Aluminum Lithium Alloy — •Muna Khushaim1, 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 Augsburg, Inst. f. Physik, D-86159 Augsburg, Germany
One of the primary materials used for structural components of aircrafts are aluminum-lithium alloys. These alloys exhibit an enhanced strength-weight ratio which makes them an attractive material for weight critical applications. This study focuses on the alloy 2195 (a member of a series of high strength Al-Li-Cu alloys known as Weldalite), which owes its superior mechanical properties to a thermo-mechanical treatment termed T8. The presence of different micro-alloying elements and an adequate heat treatment causes the precipitation of different phases such as T1 (Al2CuLi), θ′(Al2Cu) and β′(Al3Zr). Utilizing the laser assisted wide angle tomographic atom probe (LAWATAP) and local electrode atom probe (LEAP) allowed the characterization of the different precipitates that dominate the microstructure of this functional material and identify their role in the hardening process. Additionally, the effect of the microstructure on the mechanical properties of the alloy was estimated by measuring its micro-hardness.