Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 13: Magnetic Materials
MA 13.16: Vortrag
Montag, 26. März 2012, 19:00–19:15, H 0112
The effect of magnetism on strength and structural stability in ferromagnetic metals — •Mojmír Šob1,2,3 and Martin Zelený3,4 — 1Central European Institute of Technology, CEITEC MU, Masaryk University, Brno, Czech Republic — 2Department of Chemistry, Faculty of Science, Masaryk University, Brno, Czech Republic — 3Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Brno, Czech Republic — 4COMP/Department of Applied Physics, Aalto University School of Science, Aalto, Finland
We report on a strong effect of magnetism on ideal tensile strength in iron, cobalt and nickel. In nickel, the ferromagnetic (FM) modification is distinctly stronger than the nonmagnetic (NM) modification, about 1.6x for uniaxial compression along the [001] direction and for biaxial tension in the (001) plane and about 1.1x for uniaxial compression along the [111] direction and for biaxial tension in the (111) plane. On the other hand, in cobalt, the FM modification is considerably weaker than the NM modification, about 0.33x for uniaxial compression along the [001] direction and for biaxial tension in the (001) plane and about 0.60x for uniaxial compression along the [111] direction and for biaxial tension in the (111) plane. NM iron is not stable wrt tetragonal deformation and is slightly (1.09x) stronger in uniaxial tension along the [111] direction. All these effects are explained on the basis of analysis of changes in the electronic structure when magnetic order is lost.