Dislocation and void segregation in copper during neutron irradiation

Bachu Narain Singh, Torben Leffers, Andy Horsewell

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    High-purity (99. 999%) and fully annealed copper specimens have been irradiated in the DR-3 reactor at Riso to doses of 1 multiplied by 10**2**2 and 5 multiplied by 10**2**2 neutrons (fast)m** minus **2(2 multiplied by 10** minus **3 dpa and 1 multiplied by 10** minus **2 dpa, respectively); the irradiation experiments were carried out at 250 degree C. The irradiated specimens were examined by transmission electron microscopy. At both doses, the irradiation-induced structure was found to be highly segregated; the dislocation loops and segments were present in the form of irregular walls and the voids were distributed between these walls. The dislocation walls were practically free of voids and generally had a void-denuded zone along them. The density of dislocations (loops and segments) was very low in the region containing voids (i. e. between the dislocation walls). Even with this low dislocation density, the void swelling rate was very high (approximately 2. 5% per dpa). The implications of the segregated distribution of sinks for void formation and growth are briefly discussed.
    Original languageEnglish
    JournalPhilosophical magazine. A. Physics of condensed matter. Defects and mechanical properties
    Volume53
    Issue number2
    Pages (from-to)233-242
    ISSN0141-8610
    Publication statusPublished - 1986

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