Thermal stability of electrodeposited nanocrystalline Co-1.1at.%P

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Nanocrystalline Co-1.lat.%P prepared by pulsed electrodeposition was investigated with respect to thermal stability. Several characterization methods such as differential scanning calorimetry, X-ray diffraction, transmission electron microscopy, field ion microscopy and tomographic atom probe were applied. Between 673 and 733 K, the allotropic phase transformation (hcp-Co to fcc-Co) sets in and abnormal grain growth is observed. It is suggested that there is a synergistic effect between abnormal grain growth and the allotropic phase transformation. Between 733 and 753 K, the P excess of the grain boundaries decreases, CO2P and CoP precipitates form, and normal grain growth occurs. Thus, the P-segregation to the grain boundaries is held responsible for the increased thermal stability of Co-1.lat.%P at temperatures below 753 K. The thermal stability of this alloy can be mainly attributed to the reduction of grain-boundary energy. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2005-09
Language
English
Article Type
Article
Keywords

TOMOGRAPHIC ATOM-PROBE; GRAIN-BOUNDARY MOTION; NI-3.6 AT.PERCENT P; NI-P; GROWTH; NICKEL; COBALT; ALLOY; TRANSFORMATION; SEGREGATION

Citation

ACTA MATERIALIA, v.53, no.16, pp.4473 - 4481

ISSN
1359-6454
DOI
10.1016/j.actamat.2005.06.006
URI
http://hdl.handle.net/10203/207136
Appears in Collection
MS-Journal Papers(저널논문)
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