Fe-based Amorphous Alloy Composites Fabricated By Additive Manufacturing

Amorphous alloys have excellent properties due to their specific atomic structure.The Fe-based amorphous system has broad application prospects due to their low cost.However,a Fe-based BMGs with complex shape and large dimension size cannot be prepared by the traditional methods,which severely limits the development and application of Fe-based amorphous alloys.In recent years,the additive manufacturing technology（AM）,layer-by-layer shaping and consolidation process,is expected to solve the problem of forming bulk Fe-based amorphous alloys.Owing to the low fracture toughness of Fe-based amorphous,an amorphous composite material is prepared by adding a toughness phase to improve the toughness and plasticity of the Fe-based amorphous alloy.In this study,bulk Fe₃₅Cr₃₀C₁₄B₁₈Si₃（at%）amorphous alloys and composites were fabricated by AM processes.The morphology,structural characteristics,and mechanical properties of bulk Fe-based amorphous alloys and composite were systematically characterized using SEM,XRD,universal material testing machine.The micro-cracks of Fe-based amorphous alloys caused by excessive thermal stress,which cannot be completely suppressed by adjusting laser power and using laser in-situ re-scanning strategy during 3D printing.to suppress the micro-crack of Fe-based amorphous alloys,by introducing 316L SS powders with toughness phase in Fe-based amorphous powders to form composites,a crack-free Fe-based BMGC was successfully fabricated by AM processes.The 316L SS phase and the Fe-based structure were mutually wrapped.The sample showed excellent compression strength.With 316L SS content increased,the fracture mode gradually changed from brittle fracture to pure shear fracture,The Fe-based amorphous composites reinforced by 50 wt%316L SS showed a plastic strain of 18.6%.In the tensile tests,Fe-based amorphous composites did not exhibit plastic deformation,but all exhibited good fracture strength（up to 786 MPa）.