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Evaluation of matrix strength in ultra-fine grained pure Al by nanoindentation

Published online by Cambridge University Press:  31 January 2011

Ling Zhang ,
Takahito Ohmura ,
Satoshi Emura ,
Nobuaki Sekido ,
Fuxing Yin ,
Xiaohua Min  and
Kaneaki Tsuzaki
Ling Zhang*
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Kaneaki Tsuzaki
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
*
a) Address all correspondence to this author. e-mail: zhang.ling@nims.go.jp
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Abstract

Nanoindentation measurements of the grain interiors of an ultra-fine grained (UFG) pure Al produced by equal channel angular pressing were taken to evaluate the contribution of the matrix strength. Specimens were subjected to 0, 1, 2, 4, and 8 passes at ambient temperature. The nanohardness of the deformed samples was always higher than that of the undeformed sample 0P in the range of the indentation depth that was investigated, suggesting a strengthening of the matrix in the UFG Al. The increase in hardness that was contributed by the matrix to the macroscopic scale hardness was significantly large in about 40% of the deformed samples. The microstructural characterization and the deformation response analysis with the pop-in event during indentation suggested that the strengthening of the matrix originated from dislocation strengthening and some other presumable factors in the grain interiors.

Keywords

AlNanoindentationStrength
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 9 , September 2009 , pp. 2917 - 2923
Copyright
Copyright © Materials Research Society 2009

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