Precipitation Behaviour of CuCo Alloys

Abstract

The precipitation behaviour of Cu-1 at% Co and Cu-3 at% Co alloys under isothermal annealing was investigated. The present TEM and SEM work revealed that a coherent Co-rich precipitate with an octahedral shape surrounded by (110) planes was formed in the ageing process at 600 to 800 "C under zero magnetic field. Satellite precipitates were arranged adjacent to the parent large Co-rich precipitates in (100) directions.Es wurde die Eigenschaft von Cu-1 At% Co und Cu-3 At% Co Legierungen untersucht, wahrend des isothermen Temperns Ausscheidungen zu bilden. Die vorliegende Arbeit hat aufgrund von TEM und SEM Untersuchungen gezeigt, daO kohkente, Co-reiche Ausscheidungen oktahedrischer Form mit (110) Fazetten gebildet werden, wenn die Proben einem Alterungsprozei3 bei 600 bis 800 "C in verschwindendem magnetischen Feld ausgesetzt werden. Die Satellit-Ausscheidungen ordnen sich in (100) Richtung an groBen, Co-reichen Ausscheidungen an.

First principle study of cobalt impurity in bcc Fe with Cu precipitates

“…However, the cobalt precipitates resulting in precipitation hardening have been observed in fcc (1.0-2.8 at.%) Co-Cu alloys [65,66] and one can suggest their appearance in bcc Cu particles. Taking into account a possibility for cobalt clusters in bcc Cu, which was demonstrated in ''Additions in bulk bcc Fe and bcc Cu'' section, we now consider the preferable positions of cobalt dimer (25 % Co concentration in layer), trimer (37.5 % Co concentration in layer), as well as a Co monolayer (8 Co atoms or 100 % Co concentration in layer) in the Cu slab.…”

TEM Study on Precipitation Behavior in Cu–Co Alloys

“…The previous work done by the present authors has revealed that coherent f.c.c. Co-rich precipitates have an octahedral shape, as based on images for different specimen orientations [13]. This work also pointed out the possibility that a special precipitation mechanism works in the aging process of the alloy, but the task of examining the full aging process was still left over.…”

Linear arrangement of nano-scale magnetic particles formed in Cu–Fe–Ni alloys

“…Previous papers of the present group [6][7][8] have described microstructural studies of one type of granular magnetic material, namely Cu-Co alloys. These studies suggested that the precipitation of nano-scale ferromagnetic Co particles evolved under the influence of the magnetism of the particles.…”