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

Savalia  RT; Lad  KN; Pratap  ADey  GKBanerjee  S

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

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

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The formation of nano-quasicrystals on isothermal annealing of melt-spun ribbons of Zr69.5Al7.5Ni11Cu12 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.

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《Journal of thermal analysis and calorimetry》 |2004年第3期|745-751|共7页
作者
Savalia RT; Lad KN; Pratap ADey GKBanerjee S;
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作者单位

Maharaja Sayajirao Univ Baroda, Fac Engn & Technol, Dept Appl Phys, Phys Mat Condensee Lab, Vadodara 390001, India;

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正文语种英语
中图分类分析化学;
关键词
crystallization kinetics; icosahedral nano quasicrystals; Zr-Al-Ni-Cu metallic glass; DIFFERENTIAL THERMAL ANALYSIS; ALLOYS;

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

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