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Mechanical Hardness as a Probe of Nanocrystalline Materials

Published online by Cambridge University Press:  15 February 2011

C. C. Koch ,
T. D. Shen ,
T. Malow  and
O. Spaldon
C. C. Koch
Affiliation:
Materials Science and Engineering Department, North Carolina State University, Raleigh, NC 27695-7907
T. D. Shen
Affiliation:
Materials Science and Engineering Department, North Carolina State University, Raleigh, NC 27695-7907
T. Malow
Affiliation:
Materials Science and Engineering Department, North Carolina State University, Raleigh, NC 27695-7907
O. Spaldon
Affiliation:
Materials Science and Engineering Department, North Carolina State University, Raleigh, NC 27695-7907
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Abstract

The use of mechanical hardness as a probe of nanocrystalline materials is reviewed. The fact that the grain size dependence of hardness is very different for nanocrystalline materials compared to conventional (≥1 μm diameter) polycrystals suggests a different deformation mechanism may be operative in nanocrystalline materials. Hardness is useful for following the sintering, densification reactions of nanoparticles. Solid solution hardening in nanocrystalline alloys is found to be overwhelmed by the grain boundary hardening. If alloying decreases the grain boundary hardening, i.e. increases grain size, an apparent solid solution softening effect is observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 362: Symposium J – Grain-Size and Mechanical Properties--Fundamentals and Applications , 1994 , 253
Copyright
Copyright © Materials Research Society 1995

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