Structural changes of Co<inf>70</inf>Fe<inf>5</inf>Si<inf>10</inf>B<inf>15</inf> amorphous alloy induced during heating

Abstract

In this study we present the results on complex structural changes of the Co70Fe5Si10B15 amorphous alloy induced during heating in the temperature range between 20 and 1000 °C. The structural and phase transformation changes were correlated with DTA, XRD and SEM properties. It is shown that initial Co70Fe5Si10B15 alloy during heating undergoes complex crystallochemical changes. In the range between ambient temperature and near 400 °C, investigated alloy retains the solid-state amorphous properties. Prolonged heating induces complete transformation to crystalline solid state. The solid-solid amorphous to crystalline state transformation process is completed at 500 °C, when two nanocrystalline phase alloy systems are formed. Prolonged thermal treatment between 600 and 1000 °C, influenced further elemental segregation and phase transition. At 1000 °C, the composite material consisting of two FCC cobalt-rich alloys and a hexagonal unidentified alloy are formed. © 2006 Elsevier B.V. All rights reserved.