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A Cbed Procedure for Determining Local Residual Stresses from Nanoscale Areas in Cermets

Published online by Cambridge University Press:  21 February 2011

Gyeung Ho Kim  and
Mehmet Sarikaya
Gyeung Ho Kim
Affiliation:
Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA
Mehmet Sarikaya
Affiliation:
Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA
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Abstract

A convergent beam electron diffraction method was used in a transmission electron microscope to determine residual thermal stresses from nanometer-scale areas in a ceramic-metal (cermet) composite material. It is demonstrated that the method is simple, but requires a standard sample for each of the phases in the composite. The principle of the technique is that the stresses are determined by comparing higher order Laue zone line shifts, due to lattice strain, in high-symmetry zone-axis electron diffraction patterns recorded under the same experimental conditions from the unknown phases and the standards. The application of the method to composite systems containing dissimilar phases, such as ceramic-metal composite systems, demonstrates the universality of the technique in obtaining local structural information of anisotropic strain unambiguously with a high accuracy. The procedure involved is described in detail with application to B4C-AI, a three-dimensional intertwined ceramic-metal composite.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 332: Symposium U – Determining Nanoscale Physical Properties of Materials by Microscopy and Spectroscopy , 1994 , 151
Copyright
Copyright © Materials Research Society 1994

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References

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