TY - JOUR
T1 - Evaluation of matrix strength in ultra-fine grained pure Al by nanoindentation
AU - Zhang, Ling
AU - Ohmura, Takahito
AU - Emura, Satoshi
AU - Sekido, Nobuaki
AU - Yin, Fuxing
AU - Min, Xiaohua
AU - Tsuzaki, Kaneaki
N1 - Funding Information:
This work was supported by a grant-in-aid for scientific research from the Ministry of Education, Culture, Sports, Science and Technology, Japan, in priority area “Giant straining process for advanced materials containing ultra-high density lattice defects.” The authors would like to acknowledge Prof. Zenji Horita of Kyushu University for providing the samples and discussions during the experiment and to thank the reviewers who provided many suggestions to improve the quality of the paper.
PY - 2009/9
Y1 - 2009/9
N2 - 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 OP 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.
AB - 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 OP 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.
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U2 - 10.1557/jmr.2009.0342
DO - 10.1557/jmr.2009.0342
M3 - Article
AN - SCOPUS:70350139737
SN - 0884-2914
VL - 24
SP - 2917
EP - 2923
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 9
ER -