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Schlagwörter:
Annealing; Atoms; Binary alloys; Probes; Zinc alloys, Atom probe tomography; Building blockes; Chemical compositions; Compositional evolution; Long-period stacking ordered structure; Longperiod stacking ordered structure (LPSO); Mg alloy; Stoichiometric compositions, Magnesium alloys
Zusammenfassung:
Mg alloys containing long-period stacking ordered (LPSO) structures are strong and ductile compared to conventional Mg alloys. We study here the compositional evolution of LPSO structures in a Mg97Y2Zn1 (at.) alloy upon annealing at 500 °C using atom probe tomography. In the material annealed for 2.5 h, the Zn/Y ratio of the building blocks in the interdendritic LPSO phase (0.73) is close to the stoichiometric composition of Y8Zn6 L12 clusters while that in plate-type LPSO structures (0.66) slightly deviates from the ideal value. The Y/Zn enrichment in LPSO structures in the α-Mg matrix slightly decreases with increasing annealing time. © 2018 Elsevier Ltd