High temperature deformation of a fully amorphous and partially crystallized bulk metallic glass

The mechanical behaviour, of fully amorphous and partially crystallized Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass (BMG) was studied in the supercooled liquid region. In the studied experimental domain, Newtonian flow can be obtained in the fully amorphous state but as the strain rate is increased, a transition from Newtonian to non-Newtonian behaviour is detected. After primary crystallization, the apparent viscosity is significantly increased but the deformability of the composite residual glass / nanocrystals is still large. However, in such conditions, non-Newtonian behaviours; are promoted.