Non-isothermal kinetic studies of crystallization in amorphous Al86Ni10MM4 alloy

作者：Mansouri M; Simchi A^*; Lee J I; Park E S; Varahram N

来源：Journal of Non-Crystalline Solids, 2014, 387: 36-40.

DOI：10.1016/j.jnoncrysol.2013.12.027

• Amorphous aluminum alloy
• Kinetics
• Calorimetry
• Autocatalytic model
• Nano-indentation

Al86Ni10MM4 (MM: Mischmetal) amorphous ribbons were prepared by melt spinning on a child copper wheel. Non-isothermal crystallization kinetics of the amorphous alloy was studied by differential scanning calorimetry (DSC). The crystallized phases were determined by X-ray diffraction method and transmission electron microscopy. DSC traces were analyzed by Kissinger method to determine the apparent activation energy of crystallization. Changes in the activation energy (E-alpha) with progression of crystallization were also evaluated by differential iso-conversional method of Friedman. For the precipitation of nanometer-sized Al particles, the activation energy slightly increased with increasing the conversion fraction up to alpha = 0.2, but remained almost constant until alpha = 0.8. Because of the solute enrichment around the particles in the matrix, higher values of E-alpha, were obtained at the late stage of crystallization. Results of nano-indentation test also showed a significant improvement in the hardness of the ribbons due to the formation of fcc-Al nanoparticles.

• 出版日期2014-3-1