Inhomogeneous elastic deformation of nanofilms and nanowires of NiAl and FeAl alloys

The molecular dynamics study of the uniaxial tension of nanofilms and nanowires of NiAl and FeAl intermetallide alloys has been performed. It has been shown that such samples are elastically deformed until failure at a strain of $\varepsilon_{xx}\approx 0.35$. There is an $\varepsilon_{xx}$ interval where the homogeneous deformation is thermodynamically unstable, leading to the formation of domains with different strains. The strain-stress dependence in the thermodynamically unstable region is almost linear, but has different slopes for a nanofilm and a nanowire because of the difference in the dynamics of domain walls.