| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
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Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
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| Presentation Title |
Tailoring Grain Boundaries and Precipitates in the Refractory Compositionally Complex Alloy NbMoCrTiAl Via Selective Laser Melting |
| Author(s) |
Jin Wang, Nicolas J. Peter, Liuliu Han, Alisson Kwiatkowski da Silva, Fiona Schutz, Eric Jägle, Ruth Schwaiger |
| On-Site Speaker (Planned) |
Jin Wang |
| Abstract Scope |
Al-containing refractory compositionally complex alloys such as NbMoCrTiAl were designed as materials with low density and superior mechanical performance for lightweight applications at elevated temperatures. While the Al addition reduces the alloy density, NbMoCrTiAl tends to form brittle intermetallic compounds and secondary phases including the ordered BCC phase (B2 type), Laves, and A15 phases. This is related to the limited cooling rate in conventional processing, e.g., arc-melting and casting.
We applied selective laser melting (SLM) to tailor the microstructure of NbMoCrTiAl without reducing the amount of Al, thereby maintaining the reduced density. 4D-STEM and APT confirmed that the initial microstructure consisting of the B2 matrix with grain boundary precipitates was replaced by a homogeneous BCC phase (A2 type) after SLM treatment. Correlative microstructural and mechanical characterization, i.e., EBSD and high-throughput nanoindentation analyses, were applied to understand the dependence of the microstructures on the process parameters and the resulting properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Additive Manufacturing, Mechanical Properties |