Ultrahigh-strength titanium gyroid scaffolds manufactured by selective laser melting (SLM) for bone implant applications

Ataee, A, Li, Y, Brandt, M and Wen, C 2018, 'Ultrahigh-strength titanium gyroid scaffolds manufactured by selective laser melting (SLM) for bone implant applications', Acta Materialia, vol. 158, pp. 354-368.


Document type: Journal Article
Collection: Journal Articles

Title Ultrahigh-strength titanium gyroid scaffolds manufactured by selective laser melting (SLM) for bone implant applications
Author(s) Ataee, A
Li, Y
Brandt, M
Wen, C
Year 2018
Journal name Acta Materialia
Volume number 158
Start page 354
End page 368
Total pages 15
Publisher Elsevier
Abstract Commercially pure titanium (CPTi) gyroid scaffolds with interconnected pores and high porosities in the range of 6873% and three different unit cell sizes of 2, 2.5, and 3 mm were manufactured by selective laser melting (SLM) for bone implant applications. The microstructure and mechanical properties of the scaffolds with different unit cell sizes and sample orientations were evaluated. The microstructure of as-built struts was dominated by massive martensite and the average microhardness of the struts was 2.27 GPa, which is ∼50% higher than that of dense cast CPTi. The elastic modulus and yield strength of the as-built scaffolds ranged from 1465 to 2676 MPa and from 44.9 to 56.5 MPa, respectively, values which are close to the elastic modulus of trabecular bone and presumably strong enough to bear the physiological loading of implants. The as-built scaffolds exhibited excellent ductility up to 50% strain and no sign of fracture up to 2030% strain under compression. The dominant compressive response of the scaffolds was observed by formation of a plastic hinge which led to rotation of the struts about the plastic hinges followed by development of local shear bands in struts in the long plateau region. These SLM-manufactured gyroid CPTi scaffolds with significantly enhanced hardness and compressive strength exhibited an elastic modulus close to that of trabecular bone and offer a promising improvement on CPTi scaffolds for bone implant applications.
Subject Biomechanical Engineering
Biomaterials
Manufacturing Engineering not elsewhere classified
Keyword(s) Titanium
Anisotropy
Porous material
Selective laser melting
DOI - identifier 10.1016/j.actamat.2018.08.005
Copyright notice © 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved
ISSN 1359-6454
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