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No.4(pp.127-164)

Home > Issues > Volume 7 (2002) > No.4(pp.127-164)

Effect of Co-Substitution on the Crystallization and Magnetic Properties of a Mechanically Milled Nd₁₅(Fe_1-xCo_x)₇₇B₈ (x=0-0.6) Alloy

Journal of Magnetics, Volume 7, Number 4, 31 Dec 2002, Pages 143-146

H.W. Kwon(School of Materials Science and Engineering, Pukyong National University), C.J. Yang*

(Electromagnetic Materials Laboratory, Research Institute of Industrial Science and Technology (RIST))

Abstract

Mechanical milling technique is considered to be a useful way of processing the fine Nd-Fe-B-type powder with high coercivity. In the present study, phase evolution of the Nd₁₅(Fe_1-xCo_x)₇₇B₈ (x=0-0.6) alloys during the high energy mechanical milling and annealing was investigated. The effect of Co-substitution on the crystallization of the mechanically milled Nd₁₅(Fe_1-xCo_x)₇₇B₈ amorphous material was examined. The Nd-Fe-B-type alloys can be amorphized completely by a high-energy mechanical milling. On annealing of the amorphous material, fine α-Fe crystallites form first from the amorphous. These fine α-Fe crystallites reacts with the remaining amorphous afterwards, leading to crystallization to Nd₂Fe₁₄B phase. The Co-substitution for Fe in Nd₁₅(Fe_1-xCo_x)₇₇B₈ (µx=0∼0.6) alloys lower significantly the crystallization temperature of the amorphous phase to the Nd₂Fe₁₄B phase. The mechanically milled and annealed Nd₁₅Fe₇₇B₈ alloy without Co-substitution exhibits consistently better magnetic properties with respect to the alloys with Co-substitution.

Keywords: Nd_15(Fe_1-xCo_x)_77B_8; mechanical milling; crystallization

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