Phase transformations in neutron-irradiated Zircaloys Page: 3 of 38
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relationship between the microstructure and properties are not well under-
stood. During the in-reactor irradiation, in addition to radiation-induced
defects, the fuel cladding is subject to stress and compositional changes that
are associated with in-service corrosion. Under such circumstances, impurity
or alloying elements and the radiation-induced defects or defect sinks in the
material may have synergistic effects which may lead to radiation-induced
segregation and precipitation. It is also possible that some precipitates
normally stable without irradiation are no longer stable under irradiation and
may undergo dissolution into the matrix.
Several investigators have reported evidence of interactions between
impurity or alloying elements with radiation-induced defects, which lead to a
phase transformation in some cases, as well as evidence of instability of
intermetallic precipitates under irradiation. Dissolution of the inter-
metallic precipitates Zr(FexCr^_.x)2 and Zr2(FexNi^_x), normally present in
as-fabricated Zircaloys, has been reported for specimens irradiated by
neutrons in reactor. * Interaction or trapping of niobium with radiation-
induced damage zones^ and TEM observation of radiation-enhanced precipitation
of niobium'* have been reported for Zr-2.5 wt % Nb. Trapping of Sn with
radiation-induced defects has been also inferred by Zee et al.^ from an
analysis of irradiation growth behavior of Zr-Sn alloys. Similar indirect
evidence of interaction of oxygen with radiation-induced defects has been
reported for Zircaloy-2 by several investigators from strain aging^ and
radiation-anneal hardening characteristics in a temperature range of 300
Interaction of nonmetallic impurity or alloying elements with radiation-
induced defects has been also implied from TEM microstrucutral investigations
of irradiated Zr alloys and Zircaloy-2. From an analysis of the
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Chung, H.M. Phase transformations in neutron-irradiated Zircaloys, article, April 1, 1986; United States. (https://digital.library.unt.edu/ark:/67531/metadc1094084/m1/3/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.