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Irradiation-Induced Grain Growth: Role of Dislocations*

Published online by Cambridge University Press:  25 February 2011

Charles W. Allen  and
Lynn E. Rehn
Charles W. Allen
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439 USA
Lynn E. Rehn
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439 USA
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Abstract

Existing theories of irradiation-induced grain growth assume that growth occurs by the boundary migration mechanism commonly observed for thermal growth and that it is only the point defects generated si boundaries during the irradiation which are responsible for boundary migration. In contrast, in situ observations during ion irradiation of Au films at temperatures less than 20 K even have clearly demonstrated that growth occurs both by boundary migration and by grain coalescence. Here we present further evidence for the latter. Furthermore, the substantial defect cluster activity observed during irradiation suggests that dislocations play a significant role in the growth phenomenon. Here, we also demonstrate qualitatively that glide of such dislocations to or “through” a boundary can produce essentially the same effect on boundary position or structure that the original point defects would have had if they had migrated individually to or through the boundary. Via dislocation motion, point defects originating far from a boundary may induce boundary migration or boundary structure change, and hence, grain growth.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 157: Symposium A – Beam-Solid Interactions: Physical Phenomena , 1989 , 99
Copyright
Copyright © Materials Research Society 1990

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Footnotes

*

Work supported by the U. S. Department of Energy, Basic Energy Sciences—Materials Sciences, under Contract W-31-109-Eng-38.

References

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