Nano-crystal development and thermal stability of amorphous Al-Ni-Y-Ce alloy

作者：Salehi M; Shabestari S G^*; Boutorabi S M A

来源：Journal of Non-Crystalline Solids, 2013, 375: 7-12.

DOI：10.1016/j.jnoncrysol.2013.04.059

• Aluminum alloys
• Amorphous metals
• Nanocrystals
• Thermal stability
• Transmission electron microscopy (TEM)

The crystallization kinetics and nanocrystal development of amorphous Al86Ni6Y6Ce2 (at.%) alloy in non-isothermal conditions were investigated through differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and X-ray diffraction. The kinetic parameters of the first crystallization process were determined by Kissinger and Ozawa methods. The Johnson-Mehl-Avrami equation which was extended to non-isothermal mode was used to interpret the Crystallization mechanism. The average amount of Avrami exponent (n = 1.76 +/- 0.21) concluded that the primary crystallization process occurs through three dimensional diffusion-controlled growth with decreasing rate. The alpha-Al nanoparticles about 5-8 nm in size homogeneously embedded in the glassy matrix were formed during primary crystallization.

• 出版日期2013-9-1