Investigation of Fracture Surfaces of Soft Magnetic Materials
J. Bidulskáa, T. Kvačkaja, R. Bidulskýb, M. Actis Grandeb and L. Ferrarisb
aTechnical University of Košice, Faculty of Metallurgy, Letná 9, 042 00 Košice, Slovakia
bPolitecnico di Torino-Alessandria Campus, V. Teresa Michel 5, 15100 Alessandria, Italy
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The present paper focused on the analysis of the fracture surfaces of a new development insulated iron powder compound with the addition of the aluminium alloy in order to improve the mechanical properties. Results show that in the pressed state, mainly pores act as crack initiators and due to their presence the distribution of stress is inhomogeneous across the cross-section and leads to the reduction of the effective load bearing area. Investigation of fracture surfaces concluded that improvements in bonding during the pressing process and heat treatment can be helpful in the development of soft magnetic materials to give a suitable combination between pressing pressure, annealing temperature and time as well as magnetic properties.
DOI: 10.12693/APhysPolA.118.800
PACS numbers: 75.50.-y, 81.20.Ev, 81.40.Np