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Phase Transformation of Mechanically Milled Nano-Sized -Alumina

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The phase transformation of mechanically milled nano-sized -alumina particles was investigated. The structures and phase presentation of the powders before and after milling were characterized using X-ray diffraction, transmission electron microscopy, and photoluminescence measurement. The phase transformation kinetics was investigated using differential scanning calorimetry. It was found that significant amounts of defects were generated by milling. These defects dramatically lowered the temperatures and activation energies of the transformation by promoting the nucleation and diffusion. The accumulation of the defects appears to show a logarithmic dependence of milling time.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2005.00457.x

Affiliations: 1: Laboratory of Excited State Process, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130032, China 2: Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, Florida 32816

Publication date: September 1, 2005

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