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A proposed damage gradient model for the sequential disordering induced in Sc-Ni multilayers by ion irradiation

An abnormal sequential disordering process was observed in Sc-Ni multilayers upon room temperature 200 keV xenon-ion irradiation: the Ni lattice became unstable and entered an amorphous state faster than the Sc lattice did. Since there was negligible difference in mutual solid solubility and no significant difference in melting point between the two metals, this abnormal process was attributed to the fact that the damage density in the Ni layer was calculated to be about 2-3 times that in the Sc. A damage gradient model was thus proposed in which the Sc atoms diffused much faster along an uphill damage gradient towards the Ni layer than vice versa, resulting in the Ni lattice exceeding its critical solid solubility and collapsing into a disordered state faster than the Sc lattice.