Kuo-Shung Liu1, Osamu Kawano2, Hiroyuki Yoshida3 and Yotaro Murakami2
1Graduate School, Kyoto University, Kyoto
In order to investigate the effect of the neutron irradiation on the behaviour of spherical G.P.zones and intermediate precipitates, the measurements of X-ray small angle scattering and electrical resistivity were carried out on the ternary Al-2.8 at%Zn-1.4 at%Mg and Al-5 at%Ag-5 at%Zn alloys.
Through the measurements of the scattering intensity before and after irradiation at a low temperature (∼10°K) and at an impile temperature (∼80°C), it was shown that the sizes of G.P.zones and intermediate precipitates after irradiation decrease, while the size distribution becomes wider and volume fraction becomes larger than those before irradiation. From the measurements of electrical resistivity it was shown that the precipitation of the intermediate phase in an Al-Zn-Mg alloy was delayed by irradiation. These results suggest that during irradiation at a low temperature the spherical G.P.zones and intermediate precipitates must be partially broken up by collision cascades and displacement spikes, not by thermal re-solutions.
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