Thermal and mechanical characterizations of a Zr-based bulk metallic glass composite toughened by in-situ precipitated Ta-rich particles

J. S.C. Jang, S. R. Jian, D. J. Pan, Y. H. Wu, J. C. Huang, T. G. Nieh

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The Zr53Cu30-xNi9Al8Tax (x = 2, 4, 6, 8) bulk metallic glass composites (BMGCs) rods with a diameter of 2-4 mm have been successfully fabricated by suction casting method in this study. The thermal and the mechanical properties of these Zr-based BMGCs were systematically investigated by the combination of DSC, XRD, SEM, TEM, and compression test. The results show that a superior mechanical performance with up to 30% compressive plastic strain, 1750 MPa yield strength and 2100 MPa fracture strength at room temperature can be obtained for the 2 mm diameter rod of the Zr53Cu22Ni9Al8Ta8 BMGC. There are two kinds of in-situ dispersed Ta-rich particles, micro-sized (10-30 μm), and nano-sized (20-80 nm) were found homogeneously distributed in the amorphous matrix. These Ta-rich particles act as discrete obstacles in the amorphous matrix, which separates and restricts the highly localized shear-banding, avoiding shear-through of the whole sample. This results in the formation of multiple shear bands around the Ta-rich particles and decreases the stress concentration for further propagation of shear band, and so as to enhance plasticity dramatically. In addition, the Ta-added BMG also exhibits similar GFA in comparison with the base BMG.

Original languageEnglish
Pages (from-to)560-564
Number of pages5
JournalIntermetallics
Volume18
Issue number4
DOIs
StatePublished - Apr 2010

Keywords

  • A. Composites
  • A. Metallic glasses
  • B. Mechanical properties at ambient temperature
  • B. Thermal Properties
  • F. Electron microscopy, transmission

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