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Meeting MS&T21: Materials Science & Technology
Symposium Light Metal Technology
Presentation Title Lattice Site Correspondence and Morphology of Al6Mn Precipitate
Author(s) Yuchi Wang, Yunzhi Wang, Daniel Freiberg, Yang Huo, Wendi Zhu, Robert Williams, Mei Li
On-Site Speaker (Planned) Yuchi Wang
Abstract Scope In 7xxx series Al alloys that contain Mn, Al6Mn is an important precipitate phase that enhances the alloy’s strength with precipitation hardening. To investigate the full three-dimensional (3D) morphology of the Al6Mn precipitate, two possible lattice site correspondences (LCs) between the two phases are derived from the experimentally observed orientation relationship and crystal structures of the two phases. A phase-field model is developed to simulate the 3D morphology of the Al6Mn precipitate as a function of size. The shapes and habit planes of the precipitates obtained under the two different LCs are compared with each other and to experimental characterizations by transmission electron microscope (TEM), which allow us to determine the correct LC and develop a better understanding of the different shapes of the Al6Mn precipitate observed at different 2D cross-sections of the TEM images.


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