Abstract:Fe-15Mn-5Si-xCr-0.2C (wt%) amorphous composites were fabricated by water-cooled copper crucible magnetic levitation smelting and copper mold negative pressure suction casting method. Microstructure of alloys was characterized by XRD. Single-sided notch specimen was used to study notch toughness, and morphology of specimen after fracture was analyzed by SEM. The results show that alloy system exhibits deformtion induced phase transition as loading, thus though TRIP effect enhances toughness and plasticity. Notch toughness (KQ) and fracture energy (GC) of Fe-15Mn-5Si-15Cr-0.2C sample are (108.466±5) MPa?m1/2 and 600.25 kJ/m2, respectively. A large amount of dimples and vein pattern areas are formed on fracture surface. The results indicate that appropriate addition of Cr element is beneficial to improve toughness of Fe-based amorphous composites.