Abstract
We report in-situ HRTEM observations that reveal subsequent structural events occurring during deformation of CuZr-based metallic glass. During loading, B2-CuZr nanocrystals precipitate and growth in the amorphous matrix, and consecutively crystals larger than 15nm to 20nm undergo twinning. Results underscore a transition from a deformation mechanism controlled by shear banding in glassy matrix to twinning and dislocations gliding in precipitated and coalesced crystals. These observations provide guidance for designing metallic glasses with twin structures that improve plasticity.
•In-situ tensile straining test in TEM was investigated on CuZr-Based metallic glass.•Transition from a deformation controlled by shear banding to twinning in precipitated crystals•Precipitation, growth of nanocrystals and their subsequent twinning lead to enhanced plasticity.•The TEM observations guide designing of metallic glasses with twin structures.