REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

Effects of mechanical and thermal activations on magnetic properties of nanostructured mixture Ni_85.8Fe_10.6Cu_2.2W_1.4

RADOSLAV SURLA

Faculty of Technical Sciences, University of Kragujevac, Čačak, Serbia, ekorade@gmail.com

milica M. vasić

Faculty of Physical Chemistry, University of Belgrade, Belgrade, Serbia, mvasic@ffh.bg.ac.rs

ljubica radović

Military Technical Institute, Belgrade, Serbia, ljubica.radovic@vti.vs.rs

Dušan M. Minić

Military Technical Institute, Belgrade, Serbia, minicdusan@gmail.com

Olivera kosić

Faculty of Technical Sciences, University of Kragujevac, Čačak, Serbia, olivera.kosic@mts.rs

aleksa M. Maričić

Faculty of Technical Sciences, University of Kragujevac, Čačak, Serbia, aleksa.maricic@ftn.kg.ac.rs

dragica M. minić

Faculty of Physical Chemistry, University of Belgrade, Belgrade, Serbia, dminic@ffh.bg.ac.rs

Abstract: Polycrystalline powder mixture of composition Ni_85.8Fe_10.6Cu_2.2W_1.4 was subjected to mechanical and thermal activations in order to study their influence on magnetic properties of the mixture. While the heating affected the magnetic properties through the stress-relieving processes as well as grain growth, mechanical activation shifted the value of Curie temperature toward lower temperatures with longer milling. The optimal microstructure of the sample yielding the highest value of mass magnetization was reached for the mechanical activation time of 120 min and thermal treatment up to 420 ^oC.

Keywords: nanostructure, mechanical activation, thermal treatment, magnetic properties.