Features of defect nucleation in nanosized crystals with BCC lattice

The atomic mechanisms of nucleation and development of plasticity in an iron nanocrystal under uniaxial uniform tension along different crystallographic directions were studied. It was shown that a twin is formed in the nanocrystal under tension along the [112] direction. The direct and reverse structural transformations of the crystal lattice occur according to the BCC–FCC–BCC scheme on the front of twin propagation. A significant number of twins are formed under tension of the nanocrystal along the [110] direction. In this case, the BCC–FCC–BCC and BCC–HCP– BCC local structural transformations provide the propagation of twins in the nanocrystal body.The atomic mechanisms of nucleation and development of plasticity in an iron nanocrystal under uniaxial uniform tension along different crystallographic directions were studied. It was shown that a twin is formed in the nanocrystal under tension along the [112] direction. The direct and reverse structural transformations of the crystal lattice occur according to the BCC–FCC–BCC scheme on the front of twin propagation. A significant number of twins are formed under tension of the nanocrystal along the [110] direction. In this case, the BCC–FCC–BCC and BCC–HCP– BCC local structural transformations provide the propagation of twins in the nanocrystal body.