Abstract
For the first time, the possibility of Ti6Al4V/5%Cu multi-material production by electron-beam additive technology (EBAM) with simultaneous feeding of two wires has been shown. The work shows the influence of Cu on the evolution of microstructure, phase composition and mechanical properties of Ti6Al4V/5%Cu. The simultaneous feeding of Ti and Cu wires during EBAM allows the refinement of coarse columnar grains and the formation of equiaxed ones. The Ti6Al4V/5%Cu microstructure is represented by a supersaturated solid solution of Cu (up to 5 at.%) in the α/β Widmanstätten structure. There is precipitation of Ti2Cu particles in the Ti6Al4V/5%Cu structure. Together with the effects of fine grain, solid solution, dispersion hardening and grain boundary wetting, the ultimate tensile strength of Ti6Al4V/5%Cu increased by about 20%, while the tensile strain decreased by three times.
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