Issue 49

A.V. Vakhrushev et alii, Frattura ed Integrità Strutturale, 49 (2019) 370-382; DOI: 10.3221/IGF-ESIS.49.37 379 x y z a) с) b) Figure 6: Pure aluminum sample shear strain for simulation time of 5 psec (deformation 0.035) a; 45 psec (deformation 0.315) b; 100 psec (deformation 0.700) c. x y z a) с) b) Figure 7: Shear deformation of an aluminum nanocomposite with an iron nanoparticle for a simulation time of 5 psec (deformation 0.035) a; 45 psec (deformation 0.315) b; 100 psec (deformation 0.700) c. Shear strain patterns for a nanocomposite from an aluminum matrix with a spherical iron nanoparticle are shown in Fig. 7. For a strain of 0.035 (Fig. 7 a), there is no significant distortion of the sample structure. As the strain increases to 0.315 (Fig. 7 b), lattice distortions begin to nucleate near the iron nanoparticle. With this shear deformation in Fig. 7 b, the central layer with chaotically displaced aluminum atoms is clearly visible. This area of the amorphous state of the material with increasing deformation to 0.7 gradually spreads over the entire aluminum matrix, as can be seen from Fig. 7 с. The structure of the nanoparticle remains crystalline and practically does not change during the shift. The failure of an aluminum nanocomposite with an iron nanoparticle during shear begins directly in the region of contact between the iron nanoparticle and the aluminum matrix as a result of the detachment of the aluminum matrix from the nanoparticle surface due to the mutual shear of the contacting surfaces of the nanoparticle and matrix. An interesting result was obtained by studying the shear strain for a nanocomposite from an aluminum matrix and a nanofiber from iron. The deformation patterns of this material are shown in Fig. 8. In the process of increasing the shear strain from 0.035 (Fig. 8 a) to 0.315 (Fig. 8 b) and to 0.7 (Fig. 8 c), the changes in the crystal structure of the nanocomposite are insignificant. The amorphous phase is practically absent and no damage to the material is found in the