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

增材制造结构具有固有的各向异性，这是由于该工艺的分层性质导致层间缺陷的形成，以及由于沿构建方向的外延生长而产生的首选晶体取向。点阵结构在三维中还存在与杆或特征的排列有关的进一步的各向异性。在这项工作中，评估了拓扑设计和微结构控制在Ti-6Al-4V三周期最小表面（TPMS）晶格结构激光粉末床熔合（L-PBF）中的应用，以控制各向异性的水平。该研究将强调通过定制的拓扑和微观结构控制，在增材制造的晶格结构中实现近各向同性特性的潜力，作为改善生物医学骨科植入物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.