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The Potential Role of Diffusion-Induced Grain-Boundary Migration in Extended Life Prediction

Published online by Cambridge University Press:  01 January 1992

C.A. Handwerker
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
J.E. Blendell
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
C.G. Interrante
Affiliation:
U.S. Nuclear Regulatory Commission, Washington, DC 20555
T.M. Ahn
Affiliation:
U.S. Nuclear Regulatory Commission, Washington, DC 20555
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Abstract

The selection of materials that are suitable for various high-level waste-packaging designs must reflect the need to meet requirements for long-term performance in repository environments that change with time. With this in mind, we examine how grain boundaries in materials are induced to migrate as a result of solute diffusion even at low temperatures, how the composition of the matrix material is changed significantly by this diffusion-induced grain boundary migration (DIGM), and how the changing microstructures and compositions during DIGM lead to major changes in materials performance, such as corrosion or embrittlement. Methods are discussed for prediction of the long-term behavior of materials affected by DIGM.

Type
Research Article
Copyright
Copyright © Materials Research Society 1993

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