Analysis of both nanocrystallization and creep-induced anisotropy kinetics in Fe–Si–B–Cu–Nb alloys

✍ Scribed by F. Alves; F. Simon; O. Hubert

• Book ID: 104060497
• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 322 KB
• Volume: 375-377
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2003.10.024

✦ Synopsis

Amorphous-nanocrystalline transformation in Fe 73.5 Si 15.5 B 7 Cu 1 Nb 3 is investigated by magnetostriction (λ s ) and creep-induced anisotropy measurements. Crystalline volumetric fraction, p, is checked by X-ray diffraction. The temperature dependence of magnetostriction is consistent with Herzer's dilution law. Kinetics are well described using the Johnson-Mehl-Avrami (JMA) approach with the activation energy equal to 4.5 eV. Creep-induced anisotropy is interpreted within the framework of the so-called "back stress" model. Based on these results, optimal crystalline fraction can be achieved by flash annealing. TEM imaging reveals homogeneous nanocrystallization.