Developement of Radiation Resistance Materials

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Some promising applications, such as radiation resistance materials, are forcused on newly appeared materials---amorphous metals. One of possible applications considered is a cladding material on the first wall of fusion reactor which is suffered from heavy irradiations of charged particles, neutron, and gamma ray. The reason why the amorphous metals have a radiation resistance is due to the fact that the amorphous metals with random packing structure of atoms still keep the random packing structure after the irradiation. The work was initiated in the hope that the better understanding of structural stabilities under irradiation will useful in the application of amorphous metals to caldding materials.The amorphous <Pd_(80)> <Si_(20)> alloy was obtained from the liquid state by the roller sqeeze method. The specimens were irradiated with either a 3 MeV <H^+> ion beam from the Van de Graaf accelerator of T.I.T. with total dose of 2.5x <10^(17)> p/ <cm^2> (0.049 dpa) at -150゜C or a 14 MeV fusion neutron from the RTNS-II (Rotating Target Neutron Source) of LLNL in US with total dose of 6.8 <-!+> <10^(17)> n/ <cm^2> at room temperature. The irradiated and unirradiated specimens were analyzed by both the Wide Angle X-ray Scattering (WAXA) method and the Small Angle X-ray Scattering (SAXS) method at room temperature. It is shown that the scattering intensities in wide angle region for irradiated specimen are almost identical to that for unirradiated specimen while the scattering intensities in small angle region for irradiated specimen are larger than that for unirradiated specimen, indicating that the irradiation gives rise to a density fluctuation in the specimen with a characteristic length of about 20 A.