Effect of dual scale Fe3Si phase regulation on microstructure and properties of Cu-2.5Fe-0.2Si alloy
The precipitation behaviors of submicron Fe3Si phase and nanometer Fe3Si phase were controlled by adding Si into Cu-Fe alloy and using three-stage thermomechanical treatment.The results show that a large number of fine recrystallized grains form in the aged Cu-2.5Fe-0.2Si alloy,and the tensile strength,conductivity and elongation are 401 MPa,69.25％IACS and 12.50％,respectively.The orientation relationship of nanoscale Fe3Si phase with Cu matrix is[01(1)]Cu//[11(1)]Fe3Si.The Fe3Si phases with two scales contribute to the increase of yield strength of the alloy.The contribution value of nano precipitates is greater,which is about 6 times of that of the submicron second phase.The addition of Si promotes the precipitation of iron phase in the alloy matrix,the refinement of iron phase and the dynamic recrystallization during the working process,thereby achieving the synergistic improvements of the strength,conductivity and plasticity of the alloy.
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