Deformation behavior of a Cu-based amorphous alloy under different strain rates.

The compressive deformation behavior of (Cu50Zr50)92Al8 BMG under the different strain rates ranging from 6.25 × 10-4s-1 to 2 × 10-2s-1 within the super-cooled liquid region was characterized, and the effect of the plastic deformation on the mechanical properties of the alloy was investigated. It was found that the plastic flow behavior was strongly dependent on the test temperature and applied strain rates. The BMG exhibited nearly Newtonian behavior below the strain rate of 5 × 10-3s-1 at 750K, but non-Newtonian at the high strain rates and low temperatures. The non-Newtonian plastic deformation promoted the formation of nano-crystalline in the amorphous matrix, which reduced the fracture strength of (Cu50Zr50)92Al8 BMG at room temperature. [ABSTRACT FROM AUTHOR]