About this Abstract |
| Meeting |
TMS Specialty Congress 2025
|
| Symposium
|
8th World Congress on Integrated Computational Materials Engineering (ICME 2025)
|
| Presentation Title |
Computationally Guided Alloy Design for Refractory Complex Concentrated Alloys With Tensile Ductility Made by Laser Powder Bed Fusion |
| Author(s) |
Dillon Jobes, Daniel Rubio-Ejchel, Jacob Hochhalter, Amit Misra, Liang Qi, Yong-Jie Hu, Jerard Gordon |
| On-Site Speaker (Planned) |
Liang Qi |
| Abstract Scope |
Single-phase body-centered cubic refractory complex concentrated alloys (RCCAs) retain strength at high temperatures but typically lack room-temperature ductility, causing cracking and premature failure when processed by laser-based additive manufacturing (AM). We developed an alloy design framework for enhancing tensile ductility in non-equimolar RCCAs within the Ti–V–Cr–Nb–Zr–Ta system. Density functional theory (DFT) and machine learning screened ~10⁶ alloy compositions for ductility, followed by Scheil solidification modeling to exclude compositions prone to micro-segregation and cracking. Two alloys, Ti0.4Zr0.4Nb0.1Ta0.1 and Ti0.486V0.375Ta0.028Cr0.111, were selected, fabricated via laser powder bed fusion (L-PBF) AM, and evaluated for solidification defects, microstructure, and mechanical properties. Both alloys achieved tensile yield strengths >800 MPa and failure strains >5%. Premature failure due to un-melted high melting point elements was observed, highlighting areas for further optimization. These results demonstrate the framework's effectiveness in designing ductile RCCAs for AM applications. |
| Proceedings Inclusion? |
Undecided |