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The initial formation rate and the dynamic equilibrium concentration of interstitial clusters in alpha-copper-zinc alloys has been determined for electron, proton and neutron irradiations as a function of the irradiation temperature by means of electrical resistivity techniques. The transition temperature for interstitial cluster formation is T(t) = 158 C. Below this temperature the rate of interstitial cluster formation increases rapidly with decreasing temperature until about 60 C and then decreases with further decreasing temperature. The dynamic equilibrium concentration of interstitial clusters depends on the irradiation temperature but not significantly on the magnitude of the irradiation flux or on the type of high energy particles. Previously, transition temperatures were calculated for interstitial cluster formation in gold and nickel by means of rate equations and it was found that this temperature depends mainly on the magnitude of the activation migration energy of vacancies, E(M)(1V), with the assumption that the binding energy between two interstitials E(B)(2I) is not smaller than ca. 0.6 ev. The experimentally determined transition temperature for copper-zinc alloys of T(t) = 158 C is compatible with the migration activation energy of vacancies of E(M)(1V) = 0.96 eV.

Additional information

Authors: SCHÜLE W, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Physics of Irradiation - Effects in Metal - PM 91, Siofok (HU), May 20-24, 1991
Availability: Available from (1) as Paper EN 36114 ORA
Record Number: 199210824 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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