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Microstructure of Zr3Al After 2 MeV Proton Bombardment

Published online by Cambridge University Press:  25 February 2011

F. C. Chen ,
A. J. Ardell ,
D. F. Pedraza  and
R. A. Buhl
A. J. Ardell
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, CA 90024
D. F. Pedraza
Affiliation:
Metals and Ceramics Division, P. O. Box 2008, Oak Ridge National Laboratory, Oak Ridge, TN 37831
R. A. Buhl
Affiliation:
Metals and Ceramics Division, P. O. Box 2008, Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Abstract

The ordered intermetallic Ll2 alloy Zr3Al was irradiated with 2 MeV protons at -124 °C to fluences up to 2 × 1015 H+/mm2 and at 250 °C to fluences up to 1 × 1015 H+/mm2. Defects with spherically symmetric strain fields were produced at both irradiation temperatures. They are of interstitial character at -124 °C and vacancy character at 250 °C. Disordering is induced at -124 °C, whereas irradiating at 250 °C initially lowers, then slightly raises, the degree of long-range order above its unirradiated value. Additional defects that appear as black spots were imaged using superlattice reflections in dark field. For the low-temperature irradiations they were seen at all doses, but were present at only the lowest close for the high-temperature irradiations. They are probably disordered zones, although some of the zones may be amorphous at the higher doses in the low-temperature irradiations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 279: Symposium A – Beam-Solid Interactions–Fundamentals and Applications , 1992 , 55
Copyright
Copyright © Materials Research Society 1993

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References

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