Mechanical behavior of Cu54Ni6Zr22Ti18 bulk amorphous alloy during multi-pass warm rolling

Cu-Ni-Zr-Ti bulk amorphous thin strips were produced by multi-pass warm rolling of the amorphous powder at temperatures in the supercooled liquid region. Process variables for rolling of the bulk amorphous strips were properly controlled to prevent onset of crystallization and failure during rolling up to three passes. During rolling of the amorphous powder, both the deformation and densification took place and the newly developed surface on the deformed amorphous particles enhances the consolidation leading to an increase in the strength. The strain state during rolling was analyzed by use of the finite element method. FEM results indicate that a high strain rate larger than 10s-1 prevails during rolling and gradients of the tensile strain rate in the rolling direction may initiate cracks.