NDLI: Study of formation of nano-quasicrystals and crystallization kinetics of Zr-Al-Ni-Cu metallic glass

Content Provider	Springer Nature Link
Author	Savalia, R. T. Lad, K. N. Pratap, A. Dey, G. K. Banerjee, S.
Copyright Year	2004
Abstract	The formation of nano-quasicrystals on isothermal annealing of melt-spun ribbons of Zr$_{69.5}$Al$_{7.5}$Ni$_{11}$Cu$_{12}$ metallic glass has been investigated using transmission electron microscopy (TEM). The crystallization study of this metallic glass has been carried out using differential scanning calorimetry (DSC) in non-isothermal (linear heating) mode. It exhibits two-stage crystallization where the first stage corresponds to the precipitation of icosohedral nano-quasicrystalline phase. This has been confirmed with the help of TEM investigations. The crystallization parameters like the activation energy (E $_{c}$) and frequency factor (k $_{0}$) have been derived using the Kissinger peak shift analysis. The activation energies for the first and second crystallization peak are found to be 278 and 295 kJ mol$^{-1}$, respectively. The frequency factors obtained for the two peaks are respectively 7.16·10$^{19}$ and 1.42·10$^{20}$ s$^{-1}$. E $_{c}$, k $_{0}$ and the Avrami exponent (n) have also been derived by fitting the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation for the transformed volume fraction (x) to the crystallization data. JMAK results of E $_{c}$ for the first and second crystallization peak turn out to be 270 and 290 kJ mol$^{-1}$ respectively. However, k $_{0}$ and n are found to be heating rate dependent as reported in similar studies. The values of n for the first crystallization stage ranges between 1.66 and 2.57 indicating diffusion-controlled transformation in agreement with earlier reports.
Starting Page	745
Ending Page	751
Page Count	7
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	78
Issue Number	3
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Physical Chemistry Polymer Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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