929 急冷凝固 Fe-Ga 合金における大磁歪現象

概要

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Fe-15at%Ga ribbon whose thickness was about 100μm with improvement of ductility. The Fe-15at%Ga ribbon sample showed a very large magnetostriction of ε_<max>=-400×(10)^<-6>in comparison with ε_<max>=-40×(10)^<-6> for the conventionally melt-worked bulk material at applied magnetic field, 955kA/m. In the bulk material with random crystal orientation, the dependence of magnetostriction on magnetization direction (θ) to the surface of ribbon was scarcely recognized. On the contrary, in rapid-solidified ribbon, that dependence was extraordinarily enhanced and large magnetostriction was obtained in the thickness direction of ribbon (θ≒90°) where coercive force showed the maximum value. Based on these experimental results, it is considered that the large magnetostriction is be strongly correlated with special metallic microstructures in the rapid-solidified Fe-15at%Ga ribbon with very strong magnetic anisotropy. Fe-Ga rapid-solidified ribbon has the promising possibility as a new magnetostrictive material as it has large magnetostriction, ductility and very small magnetostriction hysteresis.
社団法人日本機械学会の論文
2002-09-20