Specific volume and elastic properties of glassy, icosahedral quasicrystalline and crystalline phases in Zr-Ni-Cu-Al-Pd alloy

Dmitri V. Louzguine-Luzgin, Mikio Fukuhara, Akihisa Inoue

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Elastic properties, phase composition, microstructure and specific volume changes in the Zr65Ni10Cu5Al7.5 Pd12.5 glassy alloy during progressive devitrification have been studied by ultrasonic pulse, X-ray diffractometry, transmission electron microscopy and Archimedean methods, respectively, in terms of structure and properties change. On heating the glassy alloy initially forms an icosahedral phase and then a mixture of tI12 Zr2Niss and β-Zrss crystalline phases after annealing at 993 K for 300 s, and lastly tI12 Zr2Niss, tI6 Zr2Pd and hP9 Zr6Al2Ni crystalline phases after prolonged annealing at 993 K for 7.2 ks. In an as-solidified state the alloy shows high Poisson's and K/G ratios of 0.42 and 7, respectively. These parameters are responsible for its good ductility. The structural changes are accompanied by decreases in specific volume, bulk modulus, Lamé parameter and Poisson's ratio. Small specific volume changes upon primary devitrification suggest a close relation between the glassy and the icosahedral structures. The existence of the icosahedral local order, which exhibits rigidity for three-dimensional shear deformation with mixed mode II mode III, may be responsible for good elasticity of the glassy alloy.

Original languageEnglish
Pages (from-to)1009-1015
Number of pages7
JournalActa Materialia
Volume55
Issue number3
DOIs
Publication statusPublished - 2007 Feb 1

Keywords

  • Acoustic methods
  • Bulk amorphous materials
  • Casting
  • Elastic behaviour
  • Phase transformations

ASJC Scopus subject areas

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

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