Title

RECENT PROGRESS ON CO-BASE ALLOYS: PHASE DIAGRAMS AND APPLICATION

RECENT PROGRESS ON CO-BASE ALLOYS: PHASE DIAGRAMS AND APPLICATION

Authorship

Ishida, K.

DOI

10.5151/2594-5327-0165

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Abstract

This paper presents recent progress on the phase diagrams and design for Co-base alloys, focusing on magnetic recording media, ferromagnetic Co-Ni-Al-base shape memory alloys and Co-base superalloys. The calculated miscibility gap between ferromagnetic and paramagnetic states in the Co-X(X: Cr, Mo, W) systems was found to agree well with the experimental results, strongly implying that the magnetic induced phase separation is responsible for the compositional heterogeneity in Co-base magnetic recording media. New ferromagnetic Co-Ni-Al shape memory alloys were also developed based on phase diagrams. The introduction of !(Al structure) to the "(B2) matrix was found to drastically improve the ductility. Finally, the possibility of potent strengthening of Co-base superalloys upon precipitation of !’(L12) phase is presented.

 

This paper presents recent progress on the phase diagrams and design for Co-base alloys, focusing on magnetic recording media, ferromagnetic Co-Ni-Al-base shape memory alloys and Co-base superalloys. The calculated miscibility gap between ferromagnetic and paramagnetic states in the Co-X(X: Cr, Mo, W) systems was found to agree well with the experimental results, strongly implying that the magnetic induced phase separation is responsible for the compositional heterogeneity in Co-base magnetic recording media. New ferromagnetic Co-Ni-Al shape memory alloys were also developed based on phase diagrams. The introduction of !(Al structure) to the "(B2) matrix was found to drastically improve the ductility. Finally, the possibility of potent strengthening of Co-base superalloys upon precipitation of !’(L12) phase is presented.

Keywords

Magnetic recording media; Ferromagnetic shape memory alloy; Co-base superalloy

Magnetic recording media; Ferromagnetic shape memory alloy; Co-base superalloy