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M: Metallphysik

M 14: Postersitzung

M 14.11: Poster

Thursday, March 30, 2000, 15:00–19:00, C

preparation of ribbons of iron alloys with high si content by melt spinning and annealing in hydrogen flow — •g. david, s. roth, j. eckert, and l. schultz — institut of solid state and materials research

Recently we demonstrated using spectrometric methods, scanning electron microscopy and electron probe microanalyses that it is possible to extract boron from amorphous ribbons by annealing in hydrogen flow. This method is applied to FeCoSiTMB ribbons (TM = Mn, Cr, Ni, Cu), leading to boron-free crystalline FeCoSiTM ribbons for compositions which are not accessible by traditional metallurgy (casting, forging, rolling) because of their brittleness. The coercivity of properly annealed ribbons ranges between 0.5 and 1 A/cm. These values compare well to conventionally prepared FeCo alloys. The magnetisation in a field of 15 kA/cm varies from more than 2 T to about 1.7 T for FeCo alloys with addition of different weigth percent Si and TM.