About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
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Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Combinatorial Thin Film Screening of Non-equiatomic Refractory High Entropy Alloy |
Author(s) |
Taohid Bin Nur Tuhser, Daryl Chrzan, Andrew Minor, Mark Asta, Thomas John Balk |
On-Site Speaker (Planned) |
Taohid Bin Nur Tuhser |
Abstract Scope |
The intrinsic mechanical properties of a single-phase solid solution depend on composition. The hardness of a refractory high entropy alloy (RHEA) is related to the lattice strain stemming from atomic mismatch, and ductility can be improved by reducing the valence electron concentration (VEC). In this work, the wide non-equiatomic configurational space of VNbMoTaW was studied with the combinatorial thin-film approach. 2D gradient thin film of this alloy system was prepared by magnetron sputtering. The alloy phase map was constructed using EDS and XRD. Nanoindentation was performed at three different strain rates to compare hardness, elastic modulus, and strain rate sensitivity. In-situ fragmentation testing was done on different compositions to investigate the VEC effect on the tensile properties. Configurations with enhanced ductility were suggested based on the crack onset strain and fracture morphology. Finally, bulk samples of screened alloys were prepared, and corresponding properties were compared with the thin-film counterparts. |
Proceedings Inclusion? |
Undecided |