Crystal chemistry of anisotropy magnetic properties gas atomization powders of an alloy of the Fe-Nd-B system

Abstract

Abstract The magnetic material of Fe-Nd-B alloys is widely used in science and technology due to the unique physical and chemical properties of borides based on it. The functional properties of the material significantly depend on the structural-phase state in the alloy. The transition on the Melt Quenching technology (MQ) for its production required additional theoretical and experimental studies of the regularities of the formation and stability of the structural-phase state in multicomponent REM-containing alloys under conditions of nonequilibrium crystallization and solidification of a highly supercooled melt. The implementation of the industrial MQ technology by the method of Gas Atomization (GA) of medium pressure imposes additional significant requirements for such studies. The paper comprehensively studies and summarizes the available results on the relationship between the conditions for obtaining powder materials of Fe-Nd-B alloys by the MQ GA method and the functional properties of materials based on them. It is proved that the anisotropy features of their magnetic properties are related to the existing inhomogeneities in the distribution and morphology of Fe14Nd2B phase grains in MQ GA powder materials. A crystal-chemical explanation of the occurrence of the identified features is proposed and the possibility of their practical application is shown.