Journal
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS
Volume 27, Issue 5-8, Pages 1215-1221Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2006.08.032
Keywords
cu-co alloys; nanostructure; electron microscopy; Co particles
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The precipitation behavior of dilute Cu-Co alloys under isothermal annealing has been investigated by means of transmission electron microscopy. The observations show that different mechanisms occur in the coherent and incoherent precipitation stages. Coherent homogeneous Co particles of about 15 nm in size are consistently observed from the early stages of precipitation. The coexistence of coherent nanoscale spherical precipitates together with incoherent microscale precipitates is observed at higher temperatures, above 600 degrees C, with the latter forming well-developed and faceted Co-rich crystals. In the heterogeneous decomposition mode, the development of discontinuous precipitation colonies consisting of regularly-spaced rod-like Co particles is observed. Upon further growth, these rods break down into chains of spherical particles which are thought to be formed as a consequence of Rayleigh instability. In addition, depending on the thermal conditions, the generation of domains on the order of 100 nm is observed within the matrix, which is constituted of large grains with average size of 100 gm. (C) 2006 Published by Elsevier B.V.
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