Deformation behaviour of nanocrystalline magnesium

The deformation behaviour of nanocrystalline magnesium was studied. Nanocrystalline magnesium powder was prepared by high energy ball milling in a dry inert gas atmosphere and vacuum cold pressed to form fully dense cylindrical specimens. Compression tests were carded out at room temperature. The sa...

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Bibliographic Details
Published in:Metals and materials (Seoul, Korea) Korea), 1998-05, Vol.4 (3), p.543-547
Main Authors: Hwang, Steve, McCormick, Paul G.
Format: Article
Language:English
Subjects:
Deformation
Metallurgy
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Summary:The deformation behaviour of nanocrystalline magnesium was studied. Nanocrystalline magnesium powder was prepared by high energy ball milling in a dry inert gas atmosphere and vacuum cold pressed to form fully dense cylindrical specimens. Compression tests were carded out at room temperature. The samples exhibited remarkably high values of ductility, and a significant improvement in yield strength in sintered specimens. Large yield drops were observed on the stress-strain curve of sintered specimens. The strain rate sensitivity of the flow stress was also measured and compared to the values for commercially available pure magnesium bars. The values of activation volume as well as the stress exponent were found to be significantly lower in the nanocrystalline samples. It is speculated that grain boundary sliding controls the deformation mechanism in the nanocrystalline magnesium samples.[PUBLICATION ABSTRACT]
ISSN:1225-9438
1598-9623
2005-4149
DOI:10.1007/BF03187825