Nanocrystallization and Mechanical Properties of Rapidly Solidified Amorphous Al₈₆Ni₆Y₆Ce₂ (at.%) Alloy

Abstract:

Primary crystallization of amorphous Al₈₆Ni₆Y₆Ce₂ (at.%) alloy was investigated through differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and X-ray diffraction. Moreover, nanoindentation analysis was performed to relate the hardness to the structure of the alloy. The kinetic parameters of the first crystallization process were determined by Kissinger method. The average amount of Avrami exponent (n=1.7±0.21) was concluded the primary crystallization occurred through three dimensional diffusion-controlled growth with decreasing rate. The α-Al nanoparticles 58 nm in size homogeneously embedded in the glassy matrix were formed during primary crystallization. Significant changes in the hardness occurred due to the change of the crystalline structures. The hardness of 7.30±0.58 GPa was obtained by annealing at 618 K with a microstructure of Al nanoparticles and Al₃Ni intermetallic compound in an amorphous matrix.

• Periodical: Advanced Materials Research (Volume 829)
• Pages: 20-24
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.829.20
• Online since: November 2013
• Authors: Maryam Salehi, S.G. Shabestari*, Seyed Mohammad Ali Boutorabi
• Keywords: Aluminium Alloy, Amorphous Materials, Nanocrystal, Thermal Stability, Transmission Electron Microscopy (TEM)

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