Magnetic Anisotropy Caused by the Formation of Stress-induced Martensite in Small Iron Particles in a Copper Matrix.

概要

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Tensile and compressive stresses were applied along the [419] direction of Cu-1.53mass%Fe alloy single crystals to induce they γ→α martensitic transformation in dispersed small iron particles. The magnetic anisotropy of deformed and successively annealed specimens was examined by measuring magnetic torque around (111). The magnetic anisotropy was considered to have two origins: the crystal anisotropy due to the symmetry of the α-iron crystal and the shape anisotropy due to the shape of the α-iron particles. The shape and amplitude of the magnetic torque curves depended strongly on the sense (tension or compression) of the applied stress and on the annealing time. The torque curves were analyzed theoretically by assuming the shape of the α-iron particles as revolution ellipsoids. The preferential formation of particular Kurdjumov-Sachs variants of α-iron particles as well as the shape change of the particles by annealing could be detected easily by the magnetic anisotropy measurement.
The Iron and Steel Institute of Japanの論文