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The Analysis of Slip Propagation Across Grain Boundaries Using Tem, Anisotropic Elasticity, and Fem Techniques

Published online by Cambridge University Press:  26 February 2011

Z. Shen ,
C. Wise ,
Z. Yao ,
R. H. Wagoner  and
W. A. T. Clark
Z. Shen
Affiliation:
Department of Metallurgical Engineering, The Ohio State University, 116 West 19th Avenue, Columbus, OH 43210
C. Wise
Affiliation:
Department of Metallurgical Engineering, The Ohio State University, 116 West 19th Avenue, Columbus, OH 43210
Z. Yao
Affiliation:
Department of Metallurgical Engineering, The Ohio State University, 116 West 19th Avenue, Columbus, OH 43210
R. H. Wagoner
Affiliation:
Department of Metallurgical Engineering, The Ohio State University, 116 West 19th Avenue, Columbus, OH 43210
W. A. T. Clark
Affiliation:
Department of Metallurgical Engineering, The Ohio State University, 116 West 19th Avenue, Columbus, OH 43210
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Abstract

The quantitative TEM characterization of lattice dislocation pile-ups at grain boundaries in polycrystalline materials can provide detailed information about the crystallography and mechanisms of slip transmission across a particular interface. This is used as input data in anisotropic elastic calculations of the local stress field and forces on both sides of the interface, and gives pile-up obstacle stresses varying from 280 to 870 MPa for different boundaries in the same type 304 stainless steel sample. These calculations have also led to an improved criterion for predicting slip systems activated across an interface; a double-ended pile-up interacting with two different boundaries is used as an illustration. In addition, dynamic in situ straining experiments in the HVEM reveal mechanisms for dislocation generation not predicted from static TEM studies. Finite element modeling (FEM) is also being used to predict the complete stress and strain state of specially oriented bicrystals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 299
Copyright
Copyright © Materials Research Society 1988

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References

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