The allotropic phase transformation in milled Co and Al2O 3-Co powder mixtures prepared by mechanical alloying

Wee Sing Yeo, Henk S C Metselaar

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1 Citation (Scopus)

Abstract

The structure evolution of cobalt powder and powder mixture of 1.5wt%Al2O3-Co prepared by high-energy ball milling was investigated as a function of milling time. The results showed the phase formation of cobalt depends on milling intensity that influences the grain size and the accumulation of structure defects. Measurements of crystallite size obtained in nanocomposite are smaller than milled cobalt for all milling times. The effects of decreasing crystallize size and increasing micro-strain leads to the overall %fcc observed in nanocomposite to be higher than in milled cobalt samples. This phenomenon can be attributed by the fine dispersion of nano-alumina.

Original languageEnglish
Pages (from-to)341-345
Number of pages5
JournalSynthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry
Volume38
Issue number3 PART 2
DOIs
Publication statusPublished - 01 Apr 2008

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Mechanical alloying
Cobalt
Powders
alloying
phase transformations
cobalt
Phase transitions
Nanocomposites
nanocomposites
Aluminum Oxide
Defect structures
Milling (machining)
Ball milling
Crystallite size
balls
aluminum oxides
grain size
defects
energy

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

Cite this

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abstract = "The structure evolution of cobalt powder and powder mixture of 1.5wt{\%}Al2O3-Co prepared by high-energy ball milling was investigated as a function of milling time. The results showed the phase formation of cobalt depends on milling intensity that influences the grain size and the accumulation of structure defects. Measurements of crystallite size obtained in nanocomposite are smaller than milled cobalt for all milling times. The effects of decreasing crystallize size and increasing micro-strain leads to the overall {\%}fcc observed in nanocomposite to be higher than in milled cobalt samples. This phenomenon can be attributed by the fine dispersion of nano-alumina.",
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AB - The structure evolution of cobalt powder and powder mixture of 1.5wt%Al2O3-Co prepared by high-energy ball milling was investigated as a function of milling time. The results showed the phase formation of cobalt depends on milling intensity that influences the grain size and the accumulation of structure defects. Measurements of crystallite size obtained in nanocomposite are smaller than milled cobalt for all milling times. The effects of decreasing crystallize size and increasing micro-strain leads to the overall %fcc observed in nanocomposite to be higher than in milled cobalt samples. This phenomenon can be attributed by the fine dispersion of nano-alumina.

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