Article ID Journal Published Year Pages File Type
1486712 Journal of Non-Crystalline Solids 2005 5 Pages PDF
Abstract
Nanocrystallization kinetics of five binary Al-rare earth glassy alloys were investigated in situ using time-resolved X-ray diffraction. From the diffraction spectra parameters the crystalline phase volume fraction and mean crystal size were evaluated. The analysis show that nanocrystal growth kinetics exhibits a sharp transition between extremely rapid and very sluggish growth stage. This observation is supported by the TEM analysis. The nanocrystal size reaches from 9 to 16 nm depending on the alloy system. The crystalline volume fraction approaches 20% from which grain density of about 1.5 × 1023 m−3 is deduced. It is concluded that the nanocrystallization kinetics is governed by nucleation rate and that diffusion controlled growth plays minor role in the devitrification process.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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