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Thermal Annealing of Solid Kr Precipitates in Ni*

Published online by Cambridge University Press:  25 February 2011

R. C. Birtcher ,
J. Rest  and
D. S. Bergstrom
R. C. Birtcher
Affiliation:
Materials Science Division
J. Rest
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, IL 60439, USA
D. S. Bergstrom
Affiliation:
U. S. DOE, Basic Energy Sciences-Materials Sciences under Contract #W-31-109-ENG-38.
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Abstract

After implantation into Ni at room temperature, Kr condenses under high pressure as an fee solid aligned with the Ni lattice. Evolution of these precipitates during subsequent thermal annealing to a temperature of 650 C has been followed with transmission electron microscopy and modeled with rate theory.

Room temperature implantation results in a monomodal size distribution of small solid Kr precipitates. When Kr is implanted into Ni at 500 C, some precipitates grow to larger sizes, and the precipitate size distribution becomes bimodal. Annealing to temperatures below 600 C after room temperature implantation produces a bimodal size distribution consisting of small solid Kr precipitates and large Kr bubbles. Annealing above 600 C leads to more complete precipitate motion and coalescence that eliminates all small precipitates and results in a monomodal size distribution of large faceted bubbles.

Rate-theory modelling of Kr implantation into Ni at 500 C suggests that small solid Kr precipitates are immobile and that Kr melting is required for precipitate mobility. Similar calculations for thermal annealing experiments show that the bubble size distribution becomes bimodal when only a small fraction of the small precipitates melt and become mobile during annealing, while the size distribution remains monomodal when all precipitates become mobile after Kr melting at higher temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 157: Symposium A – Beam-Solid Interactions: Physical Phenomena , 1989 , 277
Copyright
Copyright © Materials Research Society 1990

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Footnotes

*

Work supported by the U. S. DOE, Basic Energy Sciences-Materials Sciences under Contract #W-31-109-ENG-38.

References

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