Abstract
Weldalite™ 049 is an ultrahigh strength weldable Al-Cu-Li based alloy containing minor amounts of Ag, Mg and Zr, developed at Martin Marietta. Additions of Ag and Mg seem to stimulate precipitation in this alloy, but the exact role of these elements in promoting the precipitation of strengthening phases is as yet unclear. In this paper, we report the characteristic microstructure of the Weldalite™ 049 alloy in the near peak aged T8 temper condition and its effect on the measured tensile properties of this alloy.The alloy used in this study was prepared by the Reynolds Metals Company. Measured alloy composition was Al-4.36 Cu-1.25 Li-0.39 Mg-0.35 Ag-0.14 Zr (wt.%). Tensile tests were performed at both room and cryogenic temperatures. The samples for TEM observations were cut from the mechanical testing specimens and then thinned to electron transparency by polishing and ion milling. Liquid nitrogen cooled specimen holder was used for ion milling to avoid local specimen heating. Diffraction contrast and tilting experiments were performed at 200kV in a JEM-2000FX. HREM was done in an ISI-002B at 200kV, with an interpretable resolution limit of 0.18 nm.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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