Anisotropic Ti-6Al-4V gyroid scaffolds manufactured by electron beam melting (EBM) for bone implant applications

Ataee, A, Li, Y, Fraser, D, Song, G and Wen, C 2018, 'Anisotropic Ti-6Al-4V gyroid scaffolds manufactured by electron beam melting (EBM) for bone implant applications', Materials and Design, vol. 137, pp. 345-354.


Document type: Journal Article
Collection: Journal Articles

Title Anisotropic Ti-6Al-4V gyroid scaffolds manufactured by electron beam melting (EBM) for bone implant applications
Author(s) Ataee, A
Li, Y
Fraser, D
Song, G
Wen, C
Year 2018
Journal name Materials and Design
Volume number 137
Start page 345
End page 354
Total pages 10
Publisher Elsevier
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.
Subject Metals and Alloy Materials
Biomaterials
Keyword(s) Additive manufacturing
Electron beam melting (EBM)
Gyroid scaffold
Porous material
Structural anisotropy
Ti-6Al-4V
DOI - identifier 10.1016/j.matdes.2017.10.040
Copyright notice © 2017 Elsevier Ltd
ISSN 0264-1275
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