Ultrasonic properties of Mg 23 Al 3 Y 4 alloy with LPSO structures

Mikio Fukuhara, Mitsuhiro Takeda, Kazuya Konno

Research output: Contribution to journalArticle

Abstract

Ultrasonic properties of Mg 23 Al 3 Y 4 alloy, which has a synchronized long-period stacking ordered (LPSO) structure, were examined in terms of valence electron concentration (VEC), and real and complex elasticities. The alloy locates to a point (2.54, 436.5 K) near a critical amorphous alloy composition, and a point with largest Poisson's ratio (0.322) and lower G/K (0.404) in metal group, showing a metastable like metallic alloy. The addition of small amounts of Al and Y elements, i.e. appearance of excess electrons induces an increase in c/a ratio and cell expansion of hcp Mg lattice, and stabilization of cluster structures, leading to formation of LPSO phases with L1 2 typed Al 6 Y 8 clusters. The elasticity and viscoelasticity of the alloy is predominated by three-dimensional volumetric motion, i.e., high rigidity.

Original languageEnglish
Pages (from-to)163-167
Number of pages5
JournalJournal of Alloys and Compounds
Volume755
DOIs
Publication statusPublished - 2018 Jul 30

Keywords

  • LPSO structures
  • Metastable like metallic alloy
  • Mg Al Y alloy
  • Ultrasonic properties
  • VEC

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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