Significant TRIP-effect improvement by manipulating ZrCu-B2 distribution in ZrCuAlCo-based bulk metallic glass composites via inoculating Ta particles

Y. C. Liao, S. M. Song, T. H. Li, Y. L. Chiang, P. H. Tsai, V. T. Nguyen, S. Y. Li, J. S.C. Jang, J. C. Huang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The ZrCu-B2 phase can effectively increase the plasticity for some specified Zr based metallic glasses composite (BMGC) by transformation induced plasticity (TRIP) mechanism. However, large and non-uniformly distributed ZrCu-B2 phases usually precipitate in the Zr-based BMGC samples by conventional copper mold casting. Therefore, the concept of inoculation in conventional solidification process was applied to modify the size and distribution of ZrCu-B2 phase in this study. Ta particles (size of 5–30 μm) with 0–4.0 vol% were added into the Zr48Cu47·5Al4Co0.5 BMG matrix as the inoculant. Ta particles can act as nucleation seeds for precipitating a homogeneously distributed ZrCu-B2 phase in the matrix. Moreover, the ZrCu-B2 precipitate size can be further controlled by different solidification cooling rates. It is clearly to see that the ZrCu-B2 phase embedded in the amorphous matrix for the Zr48Cu47·5Al4Co0.5 cast rods added with 0–0.75 vol% Ta particle cast by a copper mold at −30 °C (243 K, or a cooling rate of 650 K/s). In addition, the ZrCu-B2 phase exhibits a round shape and relatively homogeneous distribution. The optimum processes BMGC can exhibit significantly improved mechanical properties (1890 MPa fracture stress and 14% plastic strain) in comparison with the base BMGC (1560 MPa fracture strength and 7.5% plastic strain).

Original languageEnglish
Pages (from-to)547-555
Number of pages9
JournalJournal of Alloys and Compounds
Volume774
DOIs
StatePublished - 5 Feb 2019

Keywords

  • Composite
  • Mechanical properties
  • Solidification
  • Zr-based amorphous alloy

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