UNSPECIFIED (2001) Thermodynamic and magnetic properties of multicomponent (Fe, Ni)(70)Zr10B20 amorphous alloy powders made by mechanical alloying. In: 10th International Conference on Rapidly Quenched and Metastable Materials (RQ10), BANGALORE, INDIA, AUG 23-27, 1999. Published in: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 304 (Sp. Iss. SI). pp. 992-996.

Abstract

The correlation between the thermodynamic and magnetic properties of mechanically alloyed (MAed) (Fe1-xNix)(70)Zr10B20 (x = 0.1-0.4) amorphous alloy powders was investigated. The activation energy (E-a) for primary crystallization of the b.c.c. alpha -Fe: phase decreased significantly: from 356.7 to 139.7 kJ/mol with increasing Ni/Fe ratio from 0.11 to 0.43 and then increased to 304 kJ/mol for the alloy with a Ni/Fe ratio of 0.67. The Curie temperatures of the (Fe1-xNix)(70)Zr10B20 (x = 0.1-0.4) alloy powders milled at 18h were found to be in the range 425-625 K. The room temperature coercivity of the as-milled amorphous powders was in the range 37-44 G. However, they were dramatically reduced to values in the range 11-24 G after annealing at temperatures from 250 to 575 K. The minimum coercivities obtained after in situ annealing of amorphous powder were 8 G for (Fe0.6Ni0.4)(70)Zr10B20 and 10 G for (Fe0.8Ni0.2)(70)Zr10B20, respectively. (C) 2001 Elsevier Science B.V. All rights reserved.

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