Formation of 14H long period stacking ordered structure and profuse stacking faults in Mg-Zn-Gd alloys during isothermal aging at high temperature

Michiaki Yamasaki, Minami Sasaki, Masahiko Nishijima, Kenji Hiraga, Yoshihito Kawamura

Research output: Contribution to journalArticlepeer-review

400 Citations (Scopus)

Abstract

This paper proposes a time-temperature-transformation diagram of an Mg-Zn-Gd alloy. An Mg97Zn1Gd2 (at.%) alloy shows different precipitation sequences at low, medium and high temperatures. Low-temperature aging at <523 K brings about coherent β′-phase precipitation to a α-Mg solid solution, resulting in increase in strength of the alloys. However, aging at medium and high temperatures >623 K led to strengthening of the Mg-Zn-Gd alloy, owing to the formation of profuse stacking faults and 14H long period stacking ordered structure from the supersaturated α-Mg matrix, respectively.

Original languageEnglish
Pages (from-to)6798-6805
Number of pages8
JournalActa Materialia
Volume55
Issue number20
DOIs
Publication statusPublished - 2007 Dec

Keywords

  • Long period stacking ordered structure
  • Magnesium
  • Mg-Zn-Gd
  • Precipitation
  • β′-phase

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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