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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
Article
  • 243 Downloads

Abstract

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.

Keywords

Select Area Electron Diffraction Select Area Electron Diffraction Pattern Convergent Beam Electron Diffraction Extrude Alloy Convergent Beam Electron Diffraction Pattern 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

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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