Ultrasonic properties of Mg23Al3Y4 alloy with LPSO structures

Mikio Fukuhara, Mitsuhiro Takeda, Kazuya Konno

Research output: Contribution to journalArticlepeer-review

Abstract

Ultrasonic properties of Mg23Al3Y4 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 L12 typed Al6Y8 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
  • MgAlY alloy
  • Ultrasonic properties
  • VEC

ASJC Scopus subject areas

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

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