Metallurgical and Materials Transactions A

, Volume 44, Issue 6, pp 2839–2848 | Cite as

Characterization of an Al-Y-Zn Intermetallic Particle Phase in Extruded Mg96−x Al x Zn2Y1.9La0.1 Alloys

  • Jason P. HadornEmail author
  • Michiaki Yamasaki
  • Jonghyun Kim
  • Yoshihito Kawamura


This study focuses on extruded Mg96−x Al x Zn2Y1.9La0.1 alloys, which contain the long period stacking ordered Mg12ZnY phase. The presence of Al results in the precipitation of Al-Y-Zn precipitates, the crystal structure of which is not adequately described by ternary Al-Y-Zn phases reported in the literature. Therefore, the purpose of this investigation is to characterize the precipitates morphologically, chemically, and crystallographically. After casting, the precipitates exist as complexly shaped micron-scale clusters within the microstructure. After extrusion, the phase appears as slightly faceted particles with a plate-like morphology. The crystal structure is hexagonal and its space group is \( P6_{3} /mmc \). For the specific composition of Mg95.50Al0.50Zn2Y1.9La0.1, the lattice parameters of this ternary phase are a ≈ 8.98 Å and c ≈ 7.1 Å and the stoichiometry is near equiatomic. However, with decreasing Al content of the alloy, the c parameter, degree of atomic ordering, and Zn content of the phase are all observed to increase. Specifically, for Mg95.75Al0.25Zn2Y1.9La0.1, c ≈ 7.3 Å, and the stoichiometry is approximately AlYZn2.


Select Area Electron Diffraction Select Area Electron Diffraction Pattern Convergent Beam Electron Diffraction Extrude Alloy Convergent Beam Electron Diffraction Pattern 
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This study is partially supported by grants-in-aid for Scientific Research on Priority Areas “Synchro-LPSO Structures” from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) and for the Core-to-Core Program from the Japan Society for the Promotion of Science (JSPS).


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2013

Authors and Affiliations

  • Jason P. Hadorn
    • 1
    Email author
  • Michiaki Yamasaki
    • 1
  • Jonghyun Kim
    • 1
  • Yoshihito Kawamura
    • 1
  1. 1.Department of Materials Science and TechnologyKumamoto UniversityChuo-kuJapan

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