Improved plasticity of iron-based high-strength bulk metallic glasses by copper-induced nanocrystallization

► We achieved an enhancement of plasticity for Fe-based BMGs with the addition of Cu. ► The occurrence of nanocrystallization should be responsible for the enhancement. ► Our results suggest a promising approach enhancing the plasticity of Fe-based BMGs. ► The promising approach is microalloying and nanocrystallization.