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В. К. Носенко, Е. А. Сегида, А. А. Назаренко, В. В. Максимов, Е. А. Свиридова, С. А. Костыря
«Влияние содержания иттрия на термическую устойчивость и процессы нанокристаллизации аморфных сплавов Al86Ni6Co2Gd6?xYx и Al86Ni2Co6Gd6?xYx»
PACS numbers: 61.05.cf, 61.43.Dq, 62.20.Qp, 62.23.Pq, 81.30.Fb, 81.40.Ef, 81.70.Pg
The effect of partial replacement of Gd with Y (up to 3 at.%) in the amorphous Al86Ni6Co2Gd6 and Al86Ni2Co6Gd6 alloys on thermal stability, mechanism of the first crystallization stage, structure and properties of nanophase composites is studied by X-ray diffractometry, small-angle X-ray scattering, and microhardness-measurement techniques. As revealed, the additions of Y result in somewhat lowering both thermal stability and microhardness of amorphous alloys as well as in the change of the first crystallization stage mechanism from complex (primary???eutectic) to primary one in the Co-enriched glasses. As shown, the formation at the first crystallization stage of Al nanocrystals with average grain sizes of 14–19 nm and the volume density of (1–3,6)?1023 m?3 leads to increase of microhardness from 3150–3470 MPa to 4140–5220 MPa. As found, with respect to its thermal, structural and mechanical characteristics, the Al86Ni2Co6Gd3Y3 amorphous alloy is the most attractive for the fabrication of bulk samples by the consolidation processing.