Displacement threshold energies in Ni(Al) solid solutions and in Ni3Al

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Abstract

Resistivity damage rates, determined during low-temperature electron irradiations in the energy range 0.3–2.5 MeV, were used for evaluating displacement threshold energies of nickel and aluminium in pure nickel, short-range ordered Ni-6 at% Al and Ni-10 at% Al solid solutions, and in long-range ordered Ni3Al. These parameters were deduced from a comparison of normalized experimental displacement cross-section variations as a function of electron energy, with theoretical curves based on a displacement model for diatomic materials. The threshold energy of nickel is about the same in the three investigated alloys (TdNi = 23 ± 2 eV) as in the pure metal. The threshold energy of aluminium TdAl is of the same order as TdNi in the Ni(Al) solid solutions (22 ± 2 eV) but it is larger in the long-range ordered Ni3Al: 30 ± 2 eV.

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Present address: CEA, BP 12, F-91580 Bruyères le Châtel, France.

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