The growth mechanisms of θ′ precipitate phase in an Al-Cu alloy during aging treatment
Lin Gao, Kai Li, Song Ni, Yong Du, Min Song*()

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Fig. 2.. (a) Low magnification HAADF-STEM image showing three variants of θ' precipitates. (b) The atomic-scale HAADF-STEM image of an edge-on θ' precipitate and its coherent interface with the Al matrix. The inserted image shows the crystal structure of θ' phase. The viewing direction is parallel to [001] of the Al matrix.