Compositional Transition Layer around Growing LPSO in Mg97Zn1Y2 Cast Alloys
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概要
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Using conventional transmission electron microscopy (TEM) and aberration-corrected high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM), compositional irregularity has been identified around long-period stacking order structures (LPSOs) in aged Mg97Zn1Y2 alloys, which have coexistence of LPSO and α-Mg matrix. Elemental mappings show that compositional transition layers surround the growing LPSOs. The compositional transition layer includes solute atmosphere in the α-Mg matrix and transition layers of LPSOs with lower concentrations of solute elements. The Zn concentration in a transition layer of LPSO is higher than that of Y, which differs from the α-Mg matrix and LPSOs. The transition layer is an 18R-type stacking sequence. No transition layer was observed after the transformation from 18R-type to 14H-type LPSOs. These results indicate that the segregation of Zn is faster than that of Y, and that the transition layer is a non-stoichiometric 18R-type LPSO with Zn-rich lower concentration of the solute elements, which connects an 18R-type LPSO and an α-Mg matrix.
- The Japan Institute of Metals and Materialsの論文
著者
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KIGUCHI Takanori
Institute for Materials Research, Tohoku University
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Sato Kazuhisa
Institute For Materials Research Tohoku University
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Konno Toyohiko
Institute for Material Research, Tohoku University, Sendai 980-8577, Japan
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Kiguchi Takanori
Institute for Material Research, Tohoku University, Sendai 980-8577, Japan
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Matsunaga Shuhei
Department of Materials Science, Graduate School of Engineering, Tohoku University
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