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Effect of Hydrogen on Dislocation Emission from a Crack Tip in Nickel

Published online by Cambridge University Press:  01 January 1992

Richard G. Hoagland
Richard G. Hoagland*
Affiliation:
Dept. of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920
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Abstract

A method for determining the intrinsic resistance to dislocation emission and glide in atomic models is presented and applied to EAM models of nickel containing a single-ended crack tip. The method is an adaptation of the Peierls approach in which the work done on the glide plane is computed as a function of dislocation position and its derivative is the intrinsic resistance to dislocation motion. The results indicate that there are two parts to the resistance dislocation glide from the crack tip: a distinct barrier to injection of the dislocation from the crack tip and a periodic resistance associated with the lattice. When a hydrogen interstitial is placed on the slip plane near the crack tip the barrier height is reduced but its width is increased.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 291: Symposium O – Materials Theory and Modeling , 1992 , 103
Copyright
Copyright © Materials Research Society 1993

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References

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