Long-Period Hexagonal Structures in Melt-Spun Mg97Ln 2Zn1 (Ln=Lanthanide Metal) Alloys

Kenji Amiya, Tetsu Ohsuna, Akihisa Inoue

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112 Citations (Scopus)

Abstract

Novel long-period hexagonal structures with six and fourteen layered atomic configurations were formed in melt-spun Mg97Ln 2Zn1 (Ln=Y, Gd and Sm) ternary alloys annealed at 573 K for 1.2-3.6 ks and in an as-spun Mg97Y2Zn1 alloy, respectively. The Mg-based alloys containing La or Ce as the Ln element have a mixed structure of hep Mg and compound phases and no long-period hexagonal structure is formed in the as-spun and annealed states. There is a clear formation tendency of the novel long-period structure to increase with a decrease in the precipitation tendency of the intermetallic compound, an increase in the atomic size ratio of Ln/Mg and an enhancement of the formation tendency of Mg-based reinforced solid solution. The formation of the novel long-period structure is interpreted to result from the necessity of relaxation of strains caused by the reinforced solid solution of Ln and Zn elements into the Mg phase. In addition, the enrichment of Y and Zn elements was observed at the misfit sites of the atomic array in the fourteen layered hexagonal structure of the as-spun Mg97Y2Zn1 alloy. The atomic level segregation of Y and Zn elements is also thought to be the origin for the high stability of the long-period structure. The two types of long-period hexagonal structures found in the Mg-Ln-Zn alloys are important as a new mechanism for future development of high-strength Mg-based alloy.

Original languageEnglish
Pages (from-to)2151-2156
Number of pages6
JournalMaterials Transactions
Volume44
Issue number10
DOIs
Publication statusPublished - 2003 Oct

Keywords

  • Fourteen-layered atomic array
  • High-angle annular detector dark-field
  • High-resolution transmission electron microscopy
  • Long-period hexagonal phase
  • Magnesium-based alloy
  • Six-layered atomic array

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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