Abstract
The layer-by-layer ultrasonic peening treatment (UPT) was utilized to refine the coarse microstructure and decrease the pore number and size in the Al alloy of the Ti6Al4V/Al6.21Cu bimetallic structure with Nb interlayer manufactured by cold metal transfer additive manufacturing. After UPT, the pore in the deposited Al layer was compressed. Grains were compressed and refined significantly in the transition layer under the effect of UPT. The Nb interlayer still acted as the diffusion barrier and impeded the formation of harmful Ti-Al intermetallic compounds after UPT. The mean ultimate tensile strength of the bimetallic structure with Nb interlayer after UPT was 164.5 MPa, and increased by 36.1% compared to that of the bimetallic structure without UPT. The fracture occurred at brittle Al3Nb reaction layer for all samples.
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