(FeSm - FeAlGa COMPOSITES PREPARED BY HOT-PRESSING OF BALL MILLED POWDERS

Jarmila Degmová - Jörg Finnberg - Stefan Roth

   The present study was aimed to prepare a material which combines a high magnetostrictive strain in low magnetic fields with a high mechanical strength. Therefore we prepared composites which consist of soft magnetic Fe₇₇Al_2.4P_8.64C₅B₄Si_2.6Ga_0.8 and high magnetostrictive Fe₂Sm alloys. Ball milling of the amorphous FeAlPCBSiGa ribbon and a crystalline FeS ingot and subsequent hot pressing of the resulting powders were used to prepare disc shaped composites. A maximum magnetostrictive susceptibility of 930 ppm/T at a field of μ₀H = 0.1 T was obtained. The hardness varied from 150 HV10 to 340 HV10 with increasing amount of the amorphous phase.

Keywords: high magnetostrictive material, soft magnetic material, magnetostrictive strain, ball-milling, hot pressing

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