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Incontinuous Grain Growth in Pure Co Nanocrystalline Powders Prepared by Mechanical Attrition

Published online by Cambridge University Press:  03 March 2011

Xiaoyan Song ,
Jiuxing Zhang  and
Keyong Yang
Xiaoyan Song
Affiliation:
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
Jiuxing Zhang
Affiliation:
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
Keyong Yang
Affiliation:
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
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Abstract

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 transmission electron microscopy (TEM), high-resolution TEM, high-resolution scanning electron microscopy, and x-ray diffraction 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.

Keywords

Grain boundariesGrain growthNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 11 , November 2005 , pp. 3054 - 3060
Copyright
Copyright © Materials Research Society 2005

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