The growth of α-Fe(Si) nanocrystalline grains as a function temperature in amorphous Fe76.5-xNbxCu1Si13.5B9 (x=1, 3, 5, 7) alloys and study their hardness
DOI:
https://doi.org/10.53799/q83e4415Keywords:
Microstructure, Annealing, Amorphous ribbon, Crystallization, MicrohardnessAbstract
An amorphous ribbon of composition Fe76.5-xNbxCu1Si13.5B9 (x = 1, 3, 5, and 7) was synthesized by the rapid solidification of chilling metallic liquids by melt spinning technique. The crystallization onset temperatures for the studied samples have been evaluated from Differential Scanning Calorimetry (DSC). X-ray diffraction pattern confirms the growth of the nano-crystalline Fe(Si) phase on the amorphous matrix. Moreover, the microstructure and grain size for all samples have been determined by field emission scanning electron microscopy (FESEM). It is observed that the crystallization phase and grain sizes increase due to heat treatment. However, the sizes of grains are reduced for the replacement of Fe3+ with a high amount of Nb5+. In addition, the hardness also increases along with the increase of Nb content and heat treatment. Finally, a brief study on crystalline phase kinetics and its controlling parameters for the Finemet® alloy system has been explored.
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