Crystallization behavior of the Zr61Al7.5Cu 17.5Ni10Si4 amorphous alloy

J. S.C. Jang, Y. W. Chen, L. J. Chang, G. J. Chen

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The ribbons of amorphous Zr61Al7.5Cu 17.5Ni10Si4 alloy were studied by means of differential scanning calorimetry (DSC), X-ray diffractometry (XRD), high-temperature optical microscope and transmission electron microscopy (TEM). The activation energy for such the crystallization of the amorphous phase was about 360 and 370 kJ mole-1 calculated by Kissinger and Avrami plots, respectively. Kinetics for the crystallization was analyzed by means of Johnson-Mehl-Avrami equation and discussed regarding to the value of Avrami exponent. The average value of the Avrami exponent n was measured about 2.43 at the range from 698 to 713 K. In addition, the cube of crystal size as a function of isothermally annealing time presents a linear relationship for the Zr61Al7.5Cu17.5Ni10Si4 alloy. When the Zr61Al7.5Cu17.5Ni 10Si4 alloy was isothermally annealed at 698 K, a Zr 2Cu crystal with an average size of 105 nm was first observed at the early stage (30% crystallization) of crystallization. In addition, both nano-crystals of ordered fee ZrCu (∼100 nm) and ordered fcc Zr 3Al (∼30 nm) were observed to precipitate from the amorphous matrix upon the middle stage (50% crystallization) of crystallization.

Original languageEnglish
Pages (from-to)227-233
Number of pages7
JournalMaterials Chemistry and Physics
Issue number1
StatePublished - 15 Nov 2004


  • Amorphous alloy
  • Crystallization behavior
  • Thermal properties
  • Zirconium-based alloy


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