Structure and magnetic behaviour of Fe-Cu-Nb-Si-B-Al alloys

Fe was substituted by Al up to 7 at % in Finemet. After annealing at 550 de grees C all samples were nanocrystalline, with more or less ordered alpha-F e(Si,Al) grains; the DO3-like ordering was the most dominant in samples wit h 5 and 7 at% of Al. In as-quenched state Al decreased linearly the magneti zation, but up to 3 at% enhanced the Curie temperature of the alloy. The Cu rie temperature of the crystalline phase and the magnetization in annealed samples abruptly decreased, when there was more than 5 at% of Al in the all oy. (C) 2000 Elsevier Science B.V. All rights reserved.