Thesis
MULTI-MATERIAL STRUCTURES OF TI6AL4V AND TI6AL4V-B4C THROUGH DIRECTED ENERGY DEPOSITION-BASED ADDITIVE MANUFACTURING
Washington State University
Master of Science (MS), Washington State University
12/2024
DOI:
https://doi.org/10.7273/000007242
Abstract
The demand for advanced materials has driven innovation in titanium alloy design, particularly in the aerospace, automotive, and biomedical sectors. Additive manufacturing (AM) enables the construction of multi-material structures, offering potential improvements in mechanical properties such as wear resistance and high temperature capabilities, thus extending the service life of components such as Ti6Al4V. Directed energy deposition (DED)-based metal AM was used to manufacture radial multi-material structures with a Ti6Al4V (Ti64) core and a Ti6Al4V-5 wt.% B4C composite outer layer. X-ray diffraction analysis and microstructural observation suggest that distinct B4C particles are strongly bonded to the Ti6Al4V matrix. The addition of B4C increased the average hardness from 313 HV for Ti6Al4V to 538 HV for the composites. The addition of 5 wt.% B4C in Ti6Al4V increased the average compressive yield strength (YS) to 1440 MPa from 972 MPa for the control Ti6Al4V, i.e., ~50% increase without any significant change in the elastic modulus. The radial multi-material structures did not change the compressive modulus compared to Ti6Al4V but displayed an increase in the average compressive YS to 1422 MPa, i.e., ~45% higher than Ti6Al4V. Microstructural characterization revealed a smooth transition from the Ti6Al4V at the core to the Ti64-B4C composite outer layer. No interfacial failure was observed during compressive deformation, indicating a strong metallurgical bonding during multi-material radial composite processing. Our results
demonstrated that a significant improvement in mechanical properties can be achieved in one AM build operation through designing and processing innovative multi-material structures using DED-based metal AM.
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Details
- Title
- MULTI-MATERIAL STRUCTURES OF TI6AL4V AND TI6AL4V-B4C THROUGH DIRECTED ENERGY DEPOSITION-BASED ADDITIVE MANUFACTURING
- Creators
- Nathaniel W. Zuckschwerdt
- Contributors
- Amit Bandyopadhyay (Chair)Susmita Bose (Committee Member)Kaiyan Qiu (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- School of Mechanical and Materials Engineering
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Number of pages
- 60
- Identifiers
- 99901195539701842
- Language
- English
- Resource Type
- Thesis