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During irradiation of alpha-copper-zinc alloys with high energy electrons and protons, a decrease of the electrical resistivity due to an increase of the degree of short range order is observed through radiation enhanced diffusion, followed by an increase of the electrical resistivity through the formation of radiation induced interstitial clusters. The initial formation rate of interstitial clusters increases almost linearly with the displacement rate for electron and proton irradiation. The largest initial formation rate is found between 60 and 130 C, becoming negligibly small above 158 C, and decreasing drastically below 60 C. The dynamic steady state interstitial cluster concentration increases with decreasing irradiation temperature in the investigated temperature range between 158 and 40 C. Above 158 C the formation rate of interstitial clusters is neglibly small. Thus the transition temperature for radiation induced interstitial cluster formation is 158 C, depending mainly on the migration activation energy of vacancies. The radiation induced interstitial clusters are precipitates in those alloys in which the diffusion rate of the undersized component atoms via an interstitialcy diffusion mechanism is larger than that of the other atoms.

Additional information

Authors: SCHÜLE W, JRC Ispra (IT);GIEB M, JRC Ispra (IT)
Bibliographic Reference: EUR 13270 EN (1991) 29 pp., MF, ECU 4, blow-up copy ECU 5
Availability: (2)
Record Number: 199110709 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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