Obtaining Composite Materials from Copper‐Based Alloy CuAl9Mn2 with the Addition of Different Volume Fractions of Low‐Alloyed Steel 13Mn6 by Multiwire‐Feed Electron Beam Additive Manufacturing

Composite materials based on a matrix copper alloy (CuAl9Mn2) have been obtained through the addition of low‐alloyed steel (13Mn6) in a volume fraction ranging from 5% to 95% by means of multiwire‐feed electron beam additive manufacturing. At the optimal manufacturing parameters, the samples exhibit no evidence of porosity, inclusions, imperfections, or delamination. It is shown that the addition of 13Mn6 steel, ranging from 5% to 95% by volume, influences the dendritic grain size, morphology, and mechanical properties. The primary factors influencing structure formation are the solidification of bronze inclusions in interdendritic regions or along the boundaries of steel dendrites, particularly when a smaller volume fraction of steel is added. In addition, the precipitation of small steel inclusions from the solid solution of copper in γ‐Fe is observed during cooling. In composites with a close ratio of bronze to steel, a homogeneous structure of bronze grains and steel dendrites is formed. The strength properties of the composites obtained are significantly superior to those of the matrix bronze. A moderate degree of anisotropy is observed between samples tested by static stretching in perpendicular directions.