Shear bands in amorphous alloys and their role in the formation of nanocrystals

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Resumo

The processes of evolution of the structure and surface morphology of Al87Ni8La5 and Fe76Si13B11 amorphous alloys under deformation have been studied. It is shown that the deformation occurs through the formation and propagation of shear bands, which form steps when they reach the surface. The formation of nanocrystals in shear bands was noted. It is shown that steps on the surface are formed under the combined action of several elementary shear bands. Shear bands have a variable thickness in the range from 5 to 20 nm. An elementary step has a thickness of about 15 nm. Shear bands can be combined into zones. The transverse size of the zones is about 1 μm. The formation of nanocrystals in zones can lead to anisotropy in the orientational position of nanocrystals in an amorphous matrix. With an increase in the degree of deformation, nanocrystals are formed not only in shear bands, but also in areas adjacent to them. There is a difference in the kinetics of the formation of nanocrystals in an alloy based on aluminum and iron.

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Sobre autores

A. Aronin

Institute of Solid State Physics, Russian Academy of Sciences

Autor responsável pela correspondência
Email: aronin@issp.ac.ru
Rússia, 142432, Chernogolovka

N. Volkov

Institute of Solid State Physics, Russian Academy of Sciences

Email: aronin@issp.ac.ru
Rússia, 142432, Chernogolovka

E. Pershina

Institute of Solid State Physics, Russian Academy of Sciences

Email: aronin@issp.ac.ru
Rússia, 142432, Chernogolovka

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2. Fig. 1. Image of the surface of the amorphous alloy Al87Ni8La5 after rolling ((h0–h)/h0 = 0.05).

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3. Fig. 2. Images of the shear band with aluminum nanocrystals in the amorphous alloy Al87Ni8La5 after rolling ((h0–h)/h0 = 0.05) obtained by transmission electron microscopy in the light (a) and dark field (b) modes.

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4. Fig. 3. An image of the Al87Ni8La5 PS alloy with nanocrystals (indicated by arrows) obtained using high-resolution electron microscopy.

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5. Fig. 4. The shear band and nanocrystals in the Al87Ni8La5 alloy after KVD: a – light-field image; b – dark-field image; c – electron diffraction.

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6. Fig. 5. An image of the Al87Ni8La5 alloy after KVD (e = 6.5) obtained using high-resolution electron microscopy.

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7. Fig. 6. X-ray image of the Al87Ni8La5 alloy after KVD (e = 6.5) in the region of the first diffuse maximum. The following are shown: experimental curve (1); superposition of diffuse reflections from a heterogeneous amorphous phase (curves 2 and 3) and diffraction reflections (curves marked with asterisks); total curve (4).

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8. Fig. 7. X-ray of a sample of amorphous Fe76Si13B11 alloy deformed by the CVD method (e = 5.95): the region of the first diffuse maximum and the complete X-ray (in the insert). The black curve is experimental data, the blue one is a curve describing scattering from the amorphous phase.

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9. Fig. 8. Image of the Fe76Si13B11 alloy surface after deformation of the CVD (e = 5.95) obtained by scanning electron microscopy.

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10. Fig. 9. Image of the Fe76Si13B11 surface after deformation of the KVD (e = 5.95) obtained using atomic force microscopy.

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11. Fig. 10. Cross-section profile Fe76Si13B11 after deformation of the KVD (e = 5.95).

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12. Fig. 11. The structure of the amorphous Fe76Si13B11 alloy after deformation of the KVD (e = 7.2): a – light–field image; b - dark-field image; c – electron diffraction.

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