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A large tensile plastic deformation was achieved in ZrCu-based metallic glass composites with a metastable B2 phase. It was found that the B2 phase can effectively promote the density of the stress concentration sites and enhance the formation and interaction of multiple shear bands, which significantly stabilize the tensile plastic deformation of metallic glass composites. Based on the concept of the normalized strain-hardening rate, the critical volume fraction for the stable tensile plastic deformation of metallic glass composites was determined. [ABSTRACT FROM AUTHOR]

High-entropy alloys (HEAs) are considered as promising structural materials. Usually, HEAs with face-centered cubic (FCC) structure exhibit excellent ductility but low strength, while HEAs with body-centered cubic (BCC) structure indicate relatively high fracture strength and low ductility. In this paper, a new transformable FeCoCrNiMn HEA with dual FCC and BCC phases is prepared. Under tensile loading, this HEA undergoes strong strain-hardening, exhibiting low yield strength, high ultimate tensile strength and large tensile elongation. This HEA can maintain stable plastic deformation in a wide strain region with a high constant normalized strain hardening rate, which is far different from the continuous decrease of that for the famous Cantor HEA. The strong strain-hardening capability and large tensile ductility of this HEA can be attributed to the strain-induced FCC-BCC transformation. [ABSTRACT FROM AUTHOR]