Effect of the concentration of a rare-earth component on the parameters of the nanocrystalline structure in aluminum-based alloys |
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Authors: | G E Abrosimova and A S Aronin |
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Institution: | 1.Institute of Solid State Physics,Russian Academy of Sciences,Chernogolovka, Moscow oblast,Russia |
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Abstract: | The effect of the concentration of a rare-earth component on the parameters of the nanocrystalline structure formed during
crystallization of an amorphous phase in the Al88Ni6Y6 and Al88Ni10Y2 alloys is studied using X-ray diffraction and transmission electron microscopy. It is shown that, as the yttrium concentration
increases, the nanocrystal size increases and the content of the nanocrystalline component of the structure decreases. The
precipitation of nanocrystals is accompanied by separation of the amorphous matrix into regions with different radii of the
first coordination spheres due to the enrichment or depletion with the rare-earth element. The parameters of the nanocrystalline
structure support the assumption of the heterogeneous nucleation of the nanocrystals. |
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