期刊
ACTA MATERIALIA
卷 53, 期 16, 页码 4473-4481出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2005.06.006
关键词
nanocrystalline materials; Co-P alloy; segregation; thermal stability; grain growth
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.
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