About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys V: Mechanical Behavior
|
| Presentation Title |
Micromechanical fracture and strength testing of sputtered high entropy nitrides up to 1000 °C |
| Author(s) |
Thomas E. J. Edwards, Aleksandr V. Pshyk, Fedor Klimashin, Takahito Ohmura |
| On-Site Speaker (Planned) |
Thomas E. J. Edwards |
| Abstract Scope |
We investigated the fracture toughness and compressive strength of different high/medium entropy nitrides (HENs) at temperatures up to 1000 °C by in-SEM micromechanical testing. The composition of equimolar (TiHfNbVZr)N thin films was varied either by equimolar addition of Ta & TaW, or by alloying with different Al content, requiring a novel hybrid method combining high-power impulse magnetron sputtering (HiPIMS) of Al with direct current MS or pre-alloyed targets, and a negative substrate bias synchronized to metal-rich portions of the HiPIMS pulses. Careful attention was paid to ensuring the Ga FIB milling of microcantilever notches did not affect the measured fracture toughness despite the elevated temperature testing and the large number of potentially reactive elements present. The mechanical properties were interpreted in relation to the microstructure, phase composition, and phase changes upon annealing, e.g. spinodal decomposition, and contextualised relative to competitor hard materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Mechanical Properties, Other |