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Grain size effects in nanocrystalline materials

Published online by Cambridge University Press:  31 January 2011

C. Suryanarayana ,
D. Mukhopadhyay ,
S.N. Patankar  and
F.H. Froes
C. Suryanarayana
Affiliation:
Institute for Materials and Advanced Processes, University of Idaho, Moscow, Idaho 83843-4195
D. Mukhopadhyay
Affiliation:
Institute for Materials and Advanced Processes, University of Idaho, Moscow, Idaho 83843-4195
S.N. Patankar
Affiliation:
Institute for Materials and Advanced Processes, University of Idaho, Moscow, Idaho 83843-4195
F.H. Froes
Affiliation:
Institute for Materials and Advanced Processes, University of Idaho, Moscow, Idaho 83843-4195
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Abstract

Nanocrystalline materials have a grain size of only a few nanometers and are expected to possess very high hardness and strength values. Even though the hardness/strength is expected to increase with a decrease in grain size, recent observations have indicated that the hardness increases in some cases and decreases in other cases. A careful analysis of the available results on the basis of existing models suggests that there is a critical grain size below which the triple junction volume fraction increases considerably over the grain boundary volume fraction and this is suggested to be responsible for the observed softening at small grain sizes.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 8 , August 1992 , pp. 2114 - 2118
Copyright
Copyright © Materials Research Society 1992

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