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Effect of Cascade Remnants on Freely Migrating Defects in Cu -1 % Au Alloys

Published online by Cambridge University Press:  21 February 2011

A. Iwase ,
L. E. Rehn ,
P. M. Baldo  and
L. Funk
A. Iwase
Affiliation:
Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki, 319-11, Japan
L. E. Rehn
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave. Argonne IL 60439
P. M. Baldo
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave. Argonne IL 60439
L. Funk
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave. Argonne IL 60439
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Abstract

The effects of cascade remnants on Freely Migrating Defects (FMD) were studied by measuring Radiation-Induced Segregation (RIS) in Cu-l%Au at 400°C during simultaneous irradiation with 1.5-MeV He and (400-800)-keV heavy ions (Ne, Ar or Cu). The large RIS observed during 1.5-MeV He-only irradiation was dramatically suppressed under simultaneous heavy ion irradiation. For Cu simultaneous irradiation, the suppression disappeared immediately after the Cu irradiation ceased, while for simultaneous inert gas (Ne or Ar) irradiation, the suppression persisted after the ion beam was turned off. These results demonstrate that the displacement cascades created by heavy ions introduce additional annihilation sites, which reduce the steady-state FMD concentrations. As the cascade remnants produced by Cu ions are thermally unstable at 400°C, the RIS suppression occurs only during simultaneous irradiation. On the other hand, the inert gas atoms which accumulate in the specimen apparently stabilize the cascade remnants, allowing the suppression to persist.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 396: Symposium A – Ion-Solid Interactions for Materials Modification and Processing , 1995 , 179
Copyright
Copyright © Materials Research Society 1996

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