Abstract Ti-6Al-4V gyroid scaffolds with high porosities in the range of 82–85% and three different unit cell sizes 2, 2.5 and 3 mm were manufactured by electron beam melting (EBM) for bone implant applications. The microstructure, mechanical properties and failure mode of the scaffolds with different sample orientations were evaluated. The as-built struts showed orthogonally orientated martensite α′ needles in columnar grains along the building direction with an average hardness of 3.89 GPa and the elastic modulus and yield strength of scaffolds ranged from 637 to 1084 MPa and from 13.1 to 19.2 MPa, respectively. The elastic modulus and yield strength along the build direction and perpendicular to building direction varied by ~ 70% and 49%, respectively, depending on the amount of structural anisotropy and unit cell size. The ratio of elastic modulus anisotropy in orthogonal directions was comparable to those of trabecular bone and could be in favor of bone implant applications. Furthermore, as-built scaffolds showed a mixed mode of ductile and brittle behavior under compression, and the dominant failure mode was by forming orthogonal crush bonds at the peak loads with an angle of ~ 45° with compression axis.

中文翻译：

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通过电子束熔化 (EBM) 制造的用于骨植入物的各向异性 Ti-6Al-4V 陀螺支架

摘要 Ti-6Al-4V 陀螺支架具有 82-85% 的高孔隙率和三种不同的晶胞尺寸 2、2.5 和 3 mm，通过电子束熔化 (EBM) 制造，用于骨植入物应用。评估了具有不同样品取向的支架的微观结构、力学性能和失效模式。建成后的支杆沿构建方向呈柱状晶粒中正交取向的马氏体α′针，平均硬度为3.89 GPa，支架的弹性模量和屈服强度分别为637～1084 MPa和13.1～19.2 MPa。沿构建方向和垂直于构建方向的弹性模量和屈服强度分别变化约 70% 和 49%，具体取决于结构各向异性的量和晶胞尺寸。正交方向上的弹性模量各向异性比率与骨小梁的比率相当，可能有利于骨植入物的应用。此外，竣工的脚手架在压缩下表现出韧性和脆性的混合模式，主要的失效模式是在峰值载荷下形成与压缩轴成约 45° 角的正交压碎粘合。