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No.1(pp.1-52)

Home > Issues > Volume 12 (2007) > No.1(pp.1-52)

Study of Coercivity Origin in Mechanically Alloyed Co-Zr System

Journal of Magnetics, Volume 12, Number 1, 31 Mar 2007, Pages 45-48

I.C. Jeong(Pukyong National University), H.W. Kwon*

(Pukyong National University)

Abstract

[Co_100-xZr_x ] (x=10-40) alloys were prepared by using a mechanical alloying technique. Phase constitution of the crystallised material depended on the annealing temperature. The Co₈₂Zr₁₈alloy crystallised at lower temperature around 550℃ consisted of Co₂₃Zr₆,Co₅Zr and fcc-Co phases, while the alloy crystallised at higher temperature around 800℃consisted of Co₂₃Zr₆and fcc-Co phases. Phase constitution of the crystallised material also depended on the chemical composition of the alloy. The material with lower Zr content less than 10 at% Zr consisted of Co₂₃Zr₆and fcc-Co, and the material with higher Zr-content over 30 at% consisted Co₂Zr of phase. The material containing 15-20 at% Zr consisted of Co₂₃Zr₆,Co₅Zr, and fcc-Co. Only the material containing Co₅Zr phase exhibited substantial coercivity, and it was confirmed that coercivity in the mechanically alloyed Co-Zr alloy was originated from the Co₅Zr phase.

Keywords: Co-Zr alloy; coercivity; mechanical alloying

DOI: 10.4283/JMAG.2007.12.1.45

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