Mechanical properties of Cu50Zr50 amorphous/B2-CuZr crystalline composites studied by molecular dynamic method

The effects of uniformly distributed spherical B2-CuZr crystal particles on the mechanical properties of Cu50Zr50 amorphous alloy were studied. With the increasing of the radius of B2-CuZr particles, the yield strength of nanocomposites decreases first and then increases. In this study, the material shows the best comprehensive mechanical properties when the radius of B2-CuZr particle is 2.3 nm, corresponding volume fraction is 29.1%. Compared with the Cu50Zr50 amorphous alloy, multiple shear bands were formed in the Cu50Zr50 amorphous/B2 crystalline composites during compression. Analysis of the deformation mechanism show that the amorphouscrystalline interfaces play the key role in this process. B2-CuZr particles retard the rapid expansion and propagation of the single shear band, and it makes the nanocomposites have the better plasticity than the Cu50Zr50 amorphous alloy.

Automated summary

The study found that uniformly distributed spherical B2-CuZr crystal particles in Cu50Zr50 amorphous alloy can affect its mechanical properties, with the best comprehensive performance occurring when the radius of B2-CuZr particles is 2.3 nm. Analysis shows that B2-CuZr particles can delay the expansion and propagation of shear bands, resulting in nanocomposites having better plasticity than the amorphous alloy.