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Study on the embrittlement of flash annealed Fe85.2B9.5P4Cu0.8Si0.5 metallic glass ribbons

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Pradeep,  Konda Gokuldoss
Materials Chemistry, RWTH Aachen University, Kopernikusstr.10, 52074 Aachen, Germany;
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Minnert, C., Kuhnt, M., Bruns, S., Marshal, A., Pradeep, K. G., Marsilius, M., et al. (2018). Study on the embrittlement of flash annealed Fe85.2B9.5P4Cu0.8Si0.5 metallic glass ribbons. Materials and Design, 156, 252-261. doi:10.1016/j.matdes.2018.06.055.


Cite as: http://hdl.handle.net/21.11116/0000-0001-E667-8
Abstract
Nanocrystalline Fe-based alloys have excellent soft magnetic properties, but their application is limited due to annealing induced embrittlement. In this work the embrittlement of flash annealed Fe85.2Si0.5B9.5P4Cu0.8 (at.) ribbons was investigated using two-point bending and tensile tests as well as nanoindentation testing. In addition, fracture surfaces of notched tensile specimens were analyzed in dependence on annealing temperature and correlated to mechanical and structural transitions. The amorphous ribbons have been flash annealed for 10 s at temperatures between 330 °C and 540 °C under an applied tensile stress of 20 MPa. X-ray diffraction and atom probe tomography were used to analyze the phase formation, microstructure and elemental partitioning. The results of two-point bending tests show a sharp transition from ductile to brittle behavior at annealing temperatures between 330 °C and 350 °C. The stress intensity factor is decreasing from 70.4 MPam to 3.2MPam. Thus, embrittlement takes place before the onset of crystallization at 400 °C. This embrittlement is related to a reduced shear band activity as a more localized shear activity during two-point bending. Nanoindentation results suggest a slight increase in the shear transformation zone volume, which could be related to a relaxation of free volume. © 2018