Topological design and microstructural control of Additively manufactured Ti-6Al-4V Lattices for biomedical implants

由于导致层间缺陷形成的工艺的层状性质，以及由于沿构建方向的外延生长而产生的优选的晶体取向，附加制造的结构本质上是各向异性的。格子结构遭受与3D中的支柱或特征的排列相关联的进一步各向异性。在这项工作中，评估了拓扑设计和微结构控制在Ti-6Al-4V三周期极小表面(TPMS)结构的激光粉床融合(L-PBF)中的应用，以控制各向异性水平。这项研究将强调通过量身定制的拓扑和微结构控制在附加制造的晶格结构中实现近乎各向同性性能的潜力，以此作为改善生物医学矫形植入物的结构和功能要求的手段。

Additively manufactured structures are inherently anisotropic due to the layered nature of the process that result in the formation of inter-layer defects and a preferred crystallographic orientation due to the epitaxial growth along the build direction. Lattice structures suffer from a further anisotropy associated with the arrangement of the struts or features in 3D. In this work, the utility of topological design and microstructural control in Laser Powder Bed Fusion (L-PBF) of Ti-6Al-4V Triply Periodic Minimal Surface (TPMS) lattice structures is assessed to control the levels of anisotropy. The study will highlight the potential for achieving near isotropic properties in additively manufactured lattice structures through tailored topological and microstructural control as means of improving the structural and functional requirements of biomedical orthopaedic implants.