Archives of Metallurgy and Materials

Abstract

EffEct of DEformation tEmpEraturE on thE magnEtic propErtiEs of prfeB alloy faBricatED By gas atomizationTo form the fine micro-structures, the Pr 17 Fe 78 B 5 magnet powders were produced in the optimized gas atomization conditions and it was investigated that the formation of the textures, microstructures, and the changes in the magnetic properties with increasing the deformation temperatures and rolling directions. Due to the rapid cooling system than the casting process, the homogenous microstructures were composed of the Pr-rich and Pr 2 Fe 14 B without any oxides and α-Fe and enables grain refinement. The pore ratios were 2.87, 1.42, and 0.22% at the deformation temperatures of 600, 700, 800°C, respectively in the rolled samples to align the c-axis which is the magnetic easy axis. Because Pr-rich phase cannot flow into the pore with a liquid state at low temperature, the improvement of pore densification was gradually observed with increasing deformation temperature. To confirm the magnetic decoupling effects of Pr 2 Fe 14 B phases by Pr-rich phases, the magnetic properties were investigated in rolled samples produced at the deformation temperature of 800°C. Although the remanent field is slightly decreased by 30%, the coercivity fields increased by about 2 times than that previous casted ingot. it is suggested that the gas atomization method can be suitable for fabricating grain refined and pure PrFeB magnets, and the plastic deformation conditions and rolling directions are a critical role to manipulate microstructure and magnetic properties.

Influence of Chemical Composition on the Curie Temperature Change in Amorphous Alloys

“…In many industries, great emphasis is placed on introducing better and better materials with specific properties into products. Both materials exhibiting the so-called soft magnetic properties [1,2] and hard magnetic properties [3][4][5] are desirable. Due to the constantly growing progress in the field of electronics and electrical engineering, materials with good magnetic properties that can be used as transformer cores or chokes are of particular interest [5][6][7].…”