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MM: Fachverband Metall- und Materialphysik

MM 36: Topical Session Bulk Nanostrucured Materials VIII - Functional Properties I

MM 36.5: Talk

Wednesday, March 28, 2012, 16:15–16:30, H 0106

Hysteresis measurements of HPT treated Fe-Al — •Roland Grössinger¹, Nasir Mehboob¹, Martin Kriegisch^1,2, Reiko Sato-Turtelli¹, Andrea Bachmaier³, and Reinhard Pippan³ — ¹Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10/E138; 1040 Vienna, Austria — ²Physics of Nanostructured Materials, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria — ³Erich Schmid Institute of Materials Science, ÖAW Jahnstrasse 12, 8700 Leoben, Austria

Low cost magnetostrictive materials that exhibit a large magnetostriction at low saturation field combined with a high mechanical strength and a good ductility are of great interest for applications in magneto-mechanical sensors and actuators. Substituting Fe by non-magnetic Al causes a strong increase in magnetostriction mainly due to metastable equilibrium conditions among the disordered A2 and an ordered B2 and/or DO3 structure. The magnetostrictive properties of these alloys were already studied intensively in the past. For industrial applications the frequency dependent hysteresis properties (coercivity, permeability, losses) are of great importance. For this purpose the frequency behavior of the hysteresis loop of materials with enhanced magnetostriction was studied in a frequency range between 0.5 Hz and 200 Hz. Using this method the effect of a plastic deformation at different temperatures using the High Pressure Torsion (HPT) technique was investigated. The results were analyzed applying a new eddy-current based model on the frequency dependence of the coercivity as well as losses.