OXIDATION BEHAVIOR OF OXIDE PARTICULATE REINFORCED TITANIUM COMPOSITES FABRICATED BY SELECTIVE LASER MELTING
Reinhart, Andrew J.
Hobson, Garth V.
MetadataShow full item record
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.
RightsThis 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.
Showing items related by title, author, creator and subject.
Supe, Gabriel D. (Monterey, CA; Naval Postgraduate School, 2019-06);Research was conducted for the development of formulations for additive manufacturing of metal nanoparticles that produced a 3D printed metal object without oxidation but with material properties and corrosion resistance ...
Oppici, Maria A. (Monterey, California. Naval Postgraduate School, 1995-03);The effects of sodium sulfate hot corrosion on the microstructure of silicon carbide fiber-reinforced calcium aluminosilicate glass-ceramic matrix composite were investigated using optical microscopy, scanning electron ...
Celis-Salazar, Paula; Zea, Hugo; Luhrs, Claudia; Phillips, Jonathan; Ramirez, Jose (2015);Orange II decomposition was studied on a variety of iron/carbon supported catalysts and control studies of the supports alone (carbon), and iron/alumina (non-active support). Variables tested included the impact of ...