Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Microstructure and magnetic properties of Cu-Co alloys after high pressure torsion

nr katalogowy: 79720

Granular alloys, composed of magnetic clusters embedded in nonmagnetic metallic matrices, can develop giant magnetoresistance (GMR) effect after suitable preparation and thermal treatment. The current understanding of GMR phenomenon in granular alloys is that it mainly arises from the spin-dependent scattering that takes place at the interfaces between the magnetic granules and the matrix. Also, the metallic alloys such as Cu-Co comprising magnetic and non-magnetic phases with nanometer length scale are identified as the potential candidates for the wide range of application such as sensors, loud speaker, listening devices and headphones. At the moment, there are a lot of experimental works concerning the study of magnetic properties in nanocrystalline Cu-Co alloys. The nanocrystalline state of the alloys is manufactured by different techniques which can distinctly affect their microstructure and physical properties. The ball milling [1÷5], electrodeposition [6÷11], and melt-spinning techniques [12÷16] were already used to control the microstructure and magnetic properties of nanocrystalline Cu-Co alloys. Very important method to produce bulk nanograined materials is the severe plastic deformation (SPD) [17÷20]. SPD permits to control the grain size in one- and multiphase alloys in the very broad length scale. In particular, this feature allows to reach the unique combination of the strength and plasticity [17÷20]. However, the potential of SPD to control the magnetic properties is scarcely studied, in particular in the Cu-Co alloys. The goals of this work are to investigate for the first time: (1) the microstructure evolution of the Cu-Co alloys during SPD processing, (2) the interaction of nanostructures produced in the alloys and their magnetic properties, (3) the magnetization mechanisms providing the enhancement of magnetic characteristics in Cu-Co alloys. EXPERIMENT The Cu-Co alloys with 2.2 and 4.9 wt % Co were prepar[...]

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