Abstract
The nature and orientation of anti-phase boundaries (APBs) and interphase boundaries in Al3Zr precipitates of the Al-Cu-Zr alloy were investigated by aberration-corrected scanning transmission electron microscopy (STEM). Two groups of APBs ({100} and {110}) are identified. The {100} APBs are in the majority, while the {110} APBs are for the first time observed in the Al3Zr precipitate. Both kinds of APBs are associated with a displacement vector of a/2 < 110 > in corresponding planes. Besides, two different L12/D023 interfaces (“in-phase” and “anti-phase” relationships) are formed in the Al3Zr precipitate, which is mainly caused by the activation of multiple APBs in different planes. It is clarified that the APBs play an important role in the L12-D023 transformation.
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