Enhancement of glass-forming ability and plasticity of Cu-rich Cu-Zr-Al bulk metallic glasses by minor addition of Dy

B. W. Zhou, L. Deng, X. G. Zhang, W. Zhang, H. Kimura, A. Makino

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

(Cu0.47Zr0.45Al0.08) 100-xDyx (x = 0, 1, 2, 3, 4; at.%) metallic glasses with greatly enhanced glass-forming ability (GFA) and plasticity were synthesized based on microalloying technique. The structure, thermal stability, and elastic properties of the BMG samples were studied by x-ray diffraction (XRD), differential scanning calorimetry (DSC), and ultrasonic measurements, respectively. With addition of minor dysprosium (Dy), fully metallic glassy rods with diameters exceeding 20 mm could be successfully fabricated by copper mold casting. In addition, the Cu-Zr-Al-Dy BMGs exhibit good mechanical properties under a compressive deformation mode, i.e., high yield strength of 1735-1906 MPa, Young's modulus of 85-100 GPa, and distinct plastic strain up to 4.02%. The strength and plasticity show remarkable correlations with glass transition temperature and Poisson's ratio, respectively. The role of minor Dy addition in enhancement in GFA and mechanical property of the Cu-rich BMGs is also discussed.

Original languageEnglish
Pages (from-to)1362-1368
Number of pages7
JournalJournal of Materials Research
Volume29
Issue number12
DOIs
Publication statusPublished - 2014 Jun 28

Keywords

  • bulk metallic glass
  • copper-rich alloys
  • glass-forming ability
  • mechanical property
  • microalloying technique

ASJC Scopus subject areas

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

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