Master of Science
Additively manufactured Ti-6Al-4V cellular structures are the most popular metallic choices for bonetissue engineering (BTE) applications. In this work, laser-based powder bed fusion (PBF) technologywas employed to fabricate Ti-6Al-4V cellular structures with geometries mimicking human cancellousbone properties. This study introduces novel laser scanning strategies with their associated laserbased PBF processing parameters for the fabrication of fine resolution Ti-6Al-4V cellular structureswith tailored mechanical properties to improve their mechanical performance. Two distinct designedgeometries, diamond and dodecahedron, in four different pore sizes were manufactured byemploying three different laser-based PBF scanning strategies in combination with various laserpower and scanning speeds while the laser spot size (~80μm), average powder size (34μm), andlayer thickness (30μm) remained unchanged throughout the study. The observed finest resolution ofstruts for the manufactured cellular structures was 120μm. Later, correlations between laser-basedPBF processing parameters/scanning strategies and physical/mechanical properties wereinvestigated in this study. The properties of several fabricated dodecahedron structuresdemonstrated the ability to mimic human cancellous bone properties by exhibiting compressivestrength, modulus of elasticity, and porosity in the range of 0.1-30MPa, 0.01-3GPa, and 72.6-87.4%,respectively. The concluding remarks on conceivable propriety for BTE applications incorporated thesets of scanning strategies and particular unit cell sizes of dodecahedron cellular structure.
Dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.
Salam, Muhammad Abdus, "Characterization of Ti-6Al-4V Cellular Structures for Bone Scaffolds Application" (2020). Electronic Theses and Dissertations. 2149.