OXIDATION BEHAVIOR OF OXIDE PARTICULATE REINFORCED TITANIUM COMPOSITES FABRICATED BY SELECTIVE LASER MELTING
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Authors
Reinhart, Andrew J.
Subjects
additive manufacturing
AM
titanium
oxides
scanning electron microscope
an-isotropic
AM
titanium
oxides
scanning electron microscope
an-isotropic
Advisors
Nieto, Andy
Date of Issue
2020-06
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
This thesis project mixed additive manufacturing (AM) feedstock powders of Ti-6Al-4V with 1% and 3% by volume reinforcements of Al2O3 and Ta2O5. These powders were printed using the MAE selective laser melting (SLM) printer, after which they were subjected to mechanical testing such as indentation testing and isothermal oxidation testing. Microstructural characterization was conducted using optical microscopes and scanning electron microscope (SEM) capabilities, and energy dispersive x-ray spectroscopy (EDS) maps were produced to determine homogeneity of the composite microstructure. Imaging in the SEM revealed that the sample of Ti-6Al-4V reinforced with 1% by volume of Ta2O5 experienced about 50% less oxidation in terms of oxidation layer thickness than the control sample fabricated using only commercial Ti-6Al-4V feedstock powder. Furthermore, this titanium-tantalum oxide composite exhibited a higher hardness and higher elastic modulus during both nano and micro indentation testing when compared to the control sample. Both Ti-6Al-4V Al2O5 specimens and the Ta2O5 3% sample had worse mechanical properties than the control sample; however the work spent fabricating these new materials revealed many of the potential pitfalls in composite additive manufacturing and offered insight into how to produce titanium composites via SLM for future work.
Type
Thesis
Description
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release. distribution is unlimited
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.