Journal of Materials Research
November 2005— Volume 20, Number 11

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Incontinuous grain growth in pure Co nanocrystalline powders prepared by mechanical attrition Xiaoyan Song, Jiuxing Zhang, and Keyong Yang College of Materials Science and Engineering, The Key Lab of Functional Materials of the Education Ministry, Beijing University of Technology, Beijing 100022, People's Republic of China

Highly pure Co nanocrystalline powders were prepared by high-energy ball milling under the condition that all operations on the powders were performed in the glovebox filled with highly purified argon gas. A series of annealing experiments at different temperatures were carried out to investigate grain growth in the milled powders. The as-milled and annealed microstructures were observed and analyzed with TEM, HRTEM, HRSEM, and XRD methods. Characteristics of the incontinuous grain growth in the milled nanocrystalline powders were found. It is considered by the authors that the sharp increase in nanograin size in certain intermediate-temperature region is a result of accelerated grain growth promoted by the stored energy as a supplied driving force, and through a particular dominant mechanism of nanograin rotations in contrast to grain boundary migration in polycrystalline materials.

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