The Kinetic Peculiarities of the Nanocrystallization of Amorphous Alloys Fe₈₄Nb₂B₁₄, which are Doped by Rare Earth Metals

• Main Authors: L. Boichyshyn, M. O. Danyliak, B. Kotur, T. Mika
• Format: Article
• Language: English
• Published: Vasyl Stefanyk Precarpathian National University 2018-01-01
• Series: Фізика і хімія твердого тіла
• Online Access: http://journals.pu.if.ua/index.php/pcss/article/view/2262
• ISSN: 1729-4428; 2309-8589

<span>The thermal stability and crystallization of the Fe</span>₈₂<span>Nb</span>₂<span>B</span>₁₄<span>RE</span>₂<span> (RE = Y, Gd, Tb, Dy) amorphous alloys were investigated by differential scanning calorimetric (DSC) method. By X-ray diffraction (XRD) method has been established that the initial AMA have amorphous structure. The RE alloying of Fe</span>₈₂<span>Nb</span>₂<span>B</span>₁₄<span>RE</span>₂<span> amorphous alloys increase the nanocrystallization temperatures for ~ 110 K and activation energies of crystallization for ~ 330 kJ/mol. The Avrami constant was found to be 1.86 for Fe</span>₈₄<span>Nb</span>₂<span>B</span>₁₄<span> at 703 K, 1.17 for Fe₈₂Nb₂B₁₄Y₂ at 813 K, 1.36 for Fe</span>₈₂<span>Nb</span>₂<span>B</span>₁₄<span>Gd</span>₂<span> at 808 K, 1.76 for Fe</span>₈₂<span>Nb</span>₂<span>B</span>₁₄<span>Tb</span>₂<span> at 808 K and 1.92 for Fe</span>₈₂<span>Nb</span>₂<span>B</span>₁₄<span>Dy</span>₂<span> at 808 K. Two-dimensional diffusion controlled growth mechanism with decreasing nucleation rate was observed in the alloys. </span><br /><strong>Keywords: </strong><span>Amorphous alloys; Crystallization; Kinetics models; Activation energy.</span>