Abstract
In present work, typical loading orientations were applied on an Al–Cu–Li single crystal during creep aging, and the relationship between precipitation behavior and loading orientations of the creep-aged Al–Cu–Li single crystal was studied by high angle annular dark field - scanning transmission electron microscope (HAADF-STEM) observation along multiple zone axes. The results show that the precipitation behavior of the precipitates (i.e., T1, θ′) in creep-aged Al–Cu–Li alloy was directly attributed to the loading directions. The number density of T1-phase in the creep-aged single crystal loaded close to <001>α direction is highest, and that of T1-phase is the lowest when the loading direction is < 111>α. Moreover, the oriented-precipitation of T1-phase was found in the creep-aged sample loaded close to <111>α direction, while that of θ′-phase was observed in the creep-aged sample loaded close to <011>α direction. The hardness evolution of the creep-aged samples along different loading orientations is also in agreement with the corresponding precipitation behavior. The present work proposes a novel method to regulate the precipitation behavior of the creep-aged Al–Cu–Li alloy by controlling the loading direction, and the ideal loading direction is < 001>α for the Al–Cu–Li alloy to obtain better mechanical property.
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