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Amorphization Kinetics of Zr (Cr,Fe)2 Under Ion Irradiation

Published online by Cambridge University Press:  25 February 2011

A. T. Motta ,
L. M. Howe  and
P. R. Okamoto
A. T. Motta
Affiliation:
Department of Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA
L. M. Howe
Affiliation:
AECL Research, Reactor Materials Research Branch, Chalk River Lab., Chalk River, Ontario, Canada KOJ 1J0
P. R. Okamoto
Affiliation:
Materials Science Division, Argonne National Lab., Argonne, IL 60439, USA
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Abstract

Thin foils of Zircaloy-4 were irradiated with 350 KeV 40Ar ions in the dual ion beam/HVEM facility at Argonne National Laboratory at 300 – 650 K. The irradiation-induced araorphization of the intermetallic precipitates Zr (Cr, Fe)2 and Zr2 (Ni, Fe) was studied in situ. For Zr (Cr,Fe)2 precipitates the dose-to-amorphization was found to increase exponentially with temperature, with a critical temperature of about 650 K. The amorphization morphology was shown to be homogeneous, with no preferential site for nucleation, in contrast to neutron-irradiation amorphization which started at the precipitate-matrix interface. For Zr2 (Ni,Fe) precipitates it was found that amorphization occurred at 550 K and 600 K, whereas in neutron irradiation no amorphization has been observed at those temperatures. The results are discussed in the context of the previous experimental results of neutron and electron irradiation and likely amorphization mechanisms are proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 279: Symposium A – Beam-Solid Interactions–Fundamentals and Applications , 1992 , 517
Copyright
Copyright © Materials Research Society 1993

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