| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Evaluation of Additively Manufactured Functionally Graded Titanium Alloys Tailored for Thermal Expansion Applications |
| Author(s) |
Skyler Hilburn, Timothy W. Simpson, Todd A. Palmer |
| On-Site Speaker (Planned) |
Skyler Hilburn |
| Abstract Scope |
Thermal stresses can be generated within a part due to a difference in thermal expansion at the interface with another component. Specific space applications require components to maintain accurate alignment with temperature changes. This research effort employs functional grading to tailor the thermal expansion of titanium through alloying with pure copper or pure silver. Directed energy deposition was used to produce three different compositions in each alloy system, evaluating if a rule-of-mixtures prediction was valid and determining how high the coefficient of thermal expansion could be raised. Post-build analysis showed that the phase fractions were not as predicted. Phase changes were observed after dilatometry testing and hot isostatic pressing, altering the thermal expansion behavior. Using these initial results, a functional gradient was developed to tailor the coefficient of thermal expansion. Mechanical properties were evaluated for individual compositions as well as fully graded samples to asses performance. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |