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Exploring specimen size effects in plastic deformation of Ni3(Al, Ta)

Published online by Cambridge University Press:  11 February 2011

Michael D. Uchic ,
Dennis M. Dimiduk ,
Jeffrey N. Florando  and
William D. Nix
Michael D. Uchic
Affiliation:
Air Force Research Laboratory, Materials & Manufacturing Directorate, Wright-Patterson AFB, OH 45433–7817
Dennis M. Dimiduk
Affiliation:
Air Force Research Laboratory, Materials & Manufacturing Directorate, Wright-Patterson AFB, OH 45433–7817
Jeffrey N. Florando
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
William D. Nix
Affiliation:
Stanford University, Department of Materials Science and Engineering, Stanford, CA 94305–2205
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Abstract

In this paper we present a mechanical test methodology to explore specimen size effects in Ni3Al, where the overall test sample dimensions artificially limit the volume for substructure evolution and hence the availability of jogs/kinks along individual dislocation lines. The test methodology consists of using Focused Ion Beam milling to micromachine cylindrical compression samples that have diameters ranging from 5 to 20 microns into the surface of a bulk sample, which is followed by nanoindentation using a flat-ended tip to measure the mechanical properties of the microsamples in uniaxial compression. The initial test results show that there is a strong increase in the flow stress with decreasing sample size, although misfit between the flat indenter tip and the top surface of the compression samples complicates complete interpretation of the mechanical test results at this time.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB1.4
Copyright
Copyright © Materials Research Society 2003

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References

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