Abstract
The unique flexibilities of additive manufacturing (AM) to build complex-geometry components have been well investigated; however, the potential in AM of components with high complexity in material distribution lacks exploration. To fully leverage the material-complexity capability of AM, this work processed layerwise heterostructured materials (LHM) and voxelized heterostructured material (VHM) by laser directed energy deposition (LDED) of two materials with configurable spatial architectures. The microstructure, multi-scale mechanical properties, deformation behaviour and mechanism of VHM were studied. The 3D view of VHM discloses spatially voxelized heterostructures with two materials intertwined together, following the designed pattern. The hierarchical heterogeneous phase distributions are observed across melt pools (macro-scale) and within melt pool (micro-scale) in VHM. The VHM achieves a true tensile strength of 845 MPa and a true strain of about 29%, demonstrating better mechanical properties than LHM. The tensile and compression tests of bulk samples substantiate the tensile-compression symmetry in VHM. Localized mechanical properties measurements by micropillar compressions suggest that the back stress induced by incompatible deformation between hard and soft regions enhanced the overall strength of VHM. Massive twins and stress-induced phase transformation behaviour in the soft regions are observed in the deformed sample due to the blocking of dislocations by hard regions. This work demonstrates the capability of AM in processing complex-architectured multi-materials, which highlights the potential to inherit merits from constitutive materials for better performance and functionality.
Published Version
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