Compositional evolution of long-period stacking ordered structures in magnesium studied by atom probe tomography

Kim, J.-K. and Guo, W. and Choi, P.-P. and Raabe, D.

Volume: 156 Pages: 55-59
DOI: 10.1016/j.scriptamat.2018.07.017
Published: 2018

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

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