Materials Transactions Online

Transactions of the Japan Institute of Metals, Vol. 12 No. 4 (1971) pp.229-237
© 1971 The Japan Institute of Metals

The Effects of Neutron Irradiation on Ageing and Precipitation Phenomena in Copper-Beryllium Alloys with or without Additional Elements

Hiroyuki Yoshida*, Satoru Yamamoto**,
Yotaro Murakami** and Hisao Kodaka*

In order to clarify the effects of neutron irradiation on the ageing characteristics of copper-beryllium alloys with or without small amounts of additional elements, the changes in electrical resistivities, micro-Vickers hardness, tensile properties, electron microstructures and selected area diffraction patterns were measured during ageing after irradiation with about 1∼4×1017 nvt at reactor ambient temperature. It was found that the enhancement of G. P. zone formation during irradiation occurred in supersaturated alloys, and the dissolution of G. P. zones formed and the enhancement of γ' precipitation occurred during subsequent ageing. On the basis of the experimental results, the mechanism of these effects are discussed relating the interaction with the atoms of the third elements.

(Received November 19, 1970)


* Research Reactor Institute, Kyoto University, Osaka Prefecture, Japan.

** Department of Metallugy, Faculty of Engineering, Kyoto University, Kyoto, Japan.

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