Changes of magnetic properties of Fe50Mn50 composition at mechanical alloying

The changes of magnetic properties, structure and phase composition of Fe50 Mn50 alloy obtained at mechanical proceeding of the initial mixture of elem ental powders in a planetary ball mill were studied. Single-phase state (FC C) was obtained after 30 min of proceeding. Coercivity of studied compositi on increases as the (ECC) phase appears and continues to increase even afte r the complete transformation of the alloy structure into FCC phase. Induct ion of the Fe-Mn powder decreases within the total processing period of tim e while the squareness ratio of hysteresis loop distinctly increases. The o btained data can be explained by antiferromagnetic FCC phase formation: as well as by an increase of defectivity of structure at milling. (C) 1999 Els evier Science B.V. All rights reserved.