Crystallization behavior and the thermal properties of Zr63Al7.5Cu17.5Ni10B2 bulk amorphous alloy

Jason S.C. Jang, L. J. Chang, Y. T. Jiang, P. W. Wong

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

Abstract

The ribbons of amorphous Zr63Al7.5Cu17.5Ni10B2 alloys with 0.1 mm thickness were prepared by melt spinning method. The thermal properties and micro structural development during the annealing of amorphous alloy have been investigated by a combination of differential thermal analysis, differential scanning calorimetry, high-temperature optical microscope, X-ray diffractometry and TEM. The glass transition temperature for the Zr63Al7.5Cu17.5Ni10B2 alloys are measured about 645 K (372°C). This alloy also obtains a large temperature interval ΔTx about 63 K. Meanwhile, the calculated Trg for Zr63Al7.5Cu17.5Ni10B2 alloy presents the value of 0.57. The activation energy of crystallization for the alloy Zr63Al7.5Cu17.5Ni10B2 was about 370 ± 10 kJ/mole as determined by the Kissinger and Avrami plot, respectively. These values are about 20 % higher than the activation energy of crystallization for the Zr65Al7.5Cu17.5Ni10 alloy (314kJ/mol.). This implies that the boron additions exhibit the effect of improving the thermal stability for the Zr-based alloy. The average value of the Avrami exponent n were calculated to be 1.75 ± 0.15 for Zr63Al7.5Cu17.5Ni10B2 alloy. This indicates that this alloy presents a crystallization process with decreasing nucleation rate.

Original languageEnglish
Pages (from-to)1867-1872
Number of pages6
JournalMaterials Science Forum
Volume426-432
Issue number3
StatePublished - 2003
EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
Duration: 7 Jul 200311 Jul 2003

Keywords

  • Bulk amorphous
  • Crystallization kinetics
  • Glass transition temperature
  • Thermal properties
  • Zirconium-based alloy

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