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Hall-Petch Relationship in Nano-RuAl Prepared by Mechanical Alloying

Published online by Cambridge University Press:  21 March 2011

K. W. Liu ,
F. Mücklich  and
R. Birringer
K. W. Liu
Affiliation:
Department of Materials Science, Functional Materials, Geb.22;
F. Mücklich
Affiliation:
Department of Materials Science, Functional Materials, Geb.22;
R. Birringer
Affiliation:
Department of Physics, Geb.43, P.Box 151150, D-66041 Saarbrücken, Germany Saarland University
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Abstract

A transition from a normal Hall-Petch relationship to an abnormal one is observed at a grain size of approximately 18.5 nm for nano-RuAl. Several models each representing a controlling factor have been employed to rationalize the transition mechanism. The grain sizes corresponding to the dislocation pile-ups lower bound [2] in grain interior are much smaller than the observed transition grain size and no apparent transition grain size has been derived from the grain size dependence of unit cell volume change [5]. While the grain sizes corresponding to the transition of strain rate according to Coble creep [1] and to the significant triple junction volume fraction [3, 4] (1 %) are well consistent with the observed transition grain size. The overall results indicate that the transition of H-P relationship is dominated by the weakening effect of grain boundaries and triple junctions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 676: Symposium Y – Synthesis, Functional Properties and Applications of Nanostructures , 2001 , Y3.21
Copyright
Copyright © Materials Research Society 2001

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References

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