| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Influence of Dislocation Structures on Mechanical Response in Additively-manufactured Ta-2.5%W Across Length Scales |
| Author(s) |
Kaila Morgen Bertsch, Marissa Linne, Stephen Burke, Riley Wraith, Joseph McKeown, Hye-Sook Park |
| On-Site Speaker (Planned) |
Kaila Morgen Bertsch |
| Abstract Scope |
Tantalum-tungsten alloys are of increasing research interest for applications such as hypersonics, plasma-facing reactor components, and rocket nozzles due to their high melting temperatures and balance of ductility and strength. Additive manufacturing (AM) offers the geometrical flexibility for potential rapid prototyping of these alloys. However, AM can induce distinctive microstructures that influence material performance, ranging from microcracks and pores to dislocation structures, whose effects remain poorly understood. In this work, the mechanical performance of AM and wrought Ta-2.5%W materials were evaluated under uniaxial tension via in situ SEM straining, demonstrating higher yield strength in AM material but similar failure characteristics. The microstructures were further characterized ex situ via SEM, EBSD, EDS, and TEM before and after loading to analyze the microstructural evolution throughout deformation and failure. By linking observations across length scales, new insights were gained regarding the influence of AM defects, segregation, and particularly dislocation structures on mechanical response. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, High-Temperature Materials |