| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
|
| Presentation Title |
Mechanical Properties and Microstructure Evolution of a Nanoparticle Reinforced Medium Entropy CoCrFeNi Alloy Produced by LPBF |
| Author(s) |
Gerhard Dehm, Vivek Devulapalli, Schulz Fiona, Erika Soares Barreto, Nils Ellendt, Eric A. Jägle |
| On-Site Speaker (Planned) |
Gerhard Dehm |
| Abstract Scope |
We printed dispersion strengthened CoCrFeNi alloys by adding nanoparticles to the metal powder feed, which has dual effect: improved powder flowability for LPBF printing and nano-dispersion strengthening for the printed structures. TiN nanoparticles of different sizes and volume contents were added to the powder and densely LPBF structures printed. Low volume contents of 0.5 vol% TiN nanoparticles solidified as anatase TiO2. In contrast, 5 vol% TiN formed core-shell nanoparticles with a TiOx core and a TiN shell uniformly dispersed in the matrix. We performed bulk tensile tests and nanoindentation measurements for all the alloys. Interestingly, bulk tensile testing revealed that the nano-dispersion strengthened alloys maintained a high strain to failure even at low temperature, while small differences in the hardness were allocated to the particle size distributions and volume content. The results reveal a leap forward in the LPBF fabrication of high-performance alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Mechanical Properties |