Deformation Behavior of Cu-6.5 wt.% Al Alloy Under Quasi-Static Tensile Loading

Wire-arc additive manufacturing (WAAM) based on cold metal transfer (CMT) welding process has been used to fabricate Cu-6.5 wt.% Al alloy by simultaneously feeding two separate wires. The deformation behavior of as-fabricated Cu-6.5 wt.% Al alloy and heat-treated Cu-6.5 wt.% Al alloy under quasi-static (0.1 s⁻¹) tension was investigated. The obtained tensile results show that the heat treatment can improve the mechanical properties. The enhancements of strength and ductility originate from the work-hardening capacity and fine grain due to solid solution strengthening. The TEM characterization of the samples has shown the existence of deformation twinning. The optical micrographs have shown that during the tensile process, cracks are first formed inside the large grains, and then the cracks propagate, which cause dendritic columnar structure are broken into fragments.