Metastable and quasiperiodic phases in rapidly quenched Fe-B-Si-Nb(Cu) alloys

✍ Scribed by Lyasotskii, I. V. ;Dyakonova, N. B. ;Vlasova, E. N. ;Dyakonov, D. L. ;Yazvitskii, M. Yu.

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 574 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200521126

✦ Synopsis

Abstract

The formation of metastable phases as a result of devitrification of amorphous iron‐based alloys, in particular at the initial stages of the process, was investigated. Compositions with 4–14 at% B, 3–10 at% Nb, 13–15 at% Si, 0–1 at% Cu were studied by means of transmission electron microscopy, X‐ray diffraction, and differential thermal analysis. The following metastable phases were observed: bcc phase with α‐Mn‐type structure; quasiperiodic structure with cubic symmetry; hexagonal phase (rhombohedral distortion of α‐Mn structure); and Laves C14 phase. Some of these phases are also observed in “Finemet” alloys with 1% Cu: cubic quasiperiodic phase and α‐Mn‐type phase after laser annealing of amorphous phase, and the hexagonal phase at the late stages of crystallization. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)