Anisotropy of Compressive Deformation Behavior in Cold Sprayed Cu Bulk Material.

This study is related to cold spray 3D printing (kinetic metallization) capable of manufacturing near-net shape material. Anisotropy on the compressive deformation behavior of pure copper materials manufactured using cold spray process was investigated. In addition, the deformed microstructures that change according to strain were analyzed with different direction (spraying direction, perpendicular direction). Cu bulk material manufactured through cold spray processes showed distinctive structures wherein high-density dislocations had been accumulated because individual powder particles collided at high speed. After compression with different direction, spraying direction showed 330 MPa yield strength, 437 MPa compressive peak stress and perpendicular direction showed 327 MPa (Y.S.), 422 MPa (C.P.S). In low strain condition, dynamic recovery occurred in internal dislocation structures, thereby showing strain softening phenomena even at room temperature. For a closed examine of anisotropy on the compressive deformation and fracture behavior, we used SEM, FE-SEM, XRD, EBSD and observed microstructure and fractography with different direction.