Amorphous and icosahedral phases in Ti-Zr-Cu-Ni-Be alloys

Y. C. Kim, J. M. Park, J. K. Lee, D. H. Bae, W. T. Kim, D. H. Kim

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Abstract

Crystallization behavior of melt-spun and injection cast Ti-Zr-Cu-Ni-Be alloys have been studied by using differential scanning calorimetry (DSC), X-ray diffractometry (XRD) and transmission electron microscopy (TEM). Ti40Zr28Cu9Ni7Be16 and Ti34Zr31Cu10Ni8Be17 amorphous alloys crystallized through a two step process during heating: Nanoscaled primary I-phase precipitated from an amorphous matrix first and the remaining amorphous phase crystallized into the cubic β-Ti(Zr) phase for Ti40Zr28Cu9Ni7Be16 alloy and to hexagonal Laves phase for Ti34Zr31Cu10Ni8Be17 alloy. The I-phase is stable at lower temperature and transforms into a Laves phase at high temperature through an endothermic reaction. Reversible transformation between the I-phase and Laves phase takes place during cyclic heating and cooling. In-situ composites consisting of I-phase embedded in an amorphous matrix can be fabricated by either heat treatment of fully amorphous phase or by controlling cooling rate during solidification. At lower cooling rate, I-phase forms as primary crystal in undercooled liquid and remaining liquid solidified into a glass.

Original languageEnglish
Pages (from-to)749-753
Number of pages5
JournalMaterials Science and Engineering A
Volume375-377
Issue number1-2 SPEC. ISS.
DOIs
Publication statusPublished - 2004 Jul 1

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All Science Journal Classification (ASJC) codes

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

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