Nanoindentation and orientation imaging analysis of high entropy Ti-Nb-Zr-Ta-Mo alloys exhibiting dendrite microstructure
[EN] Refractory high entropy alloys (RHEAs), particularly Ti¿Nb¿Zr¿Ta¿Mo, are promising materials because of their high mechanical properties at elevated temperatures. Although a unique solid-solution phase characterizes these materials, the dendrite structure exhibits a clear element segregation wh...
| Autores: | , , , , , |
|---|---|
| Tipo de documento: | artigo |
| Data de publicação: | 2025 |
| País: | España |
| Recursos: | Universitat Politècnica de València (UPV) |
| Repositório: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglês |
| OAI Identifier: | oai:dnet:riunet______::0425e705acbc53054328012cabcd8c8b |
| Acesso em linha: | https://riunet.upv.es/handle/10251/234702 |
| Access Level: | Acceso aberto |
| Palavra-chave: | High entropy alloys TNZT Mo effect EBSD Nanoindentation Dendrite microstructure 07.- Asegurar el acceso a energías asequibles, fiables, sostenibles y modernas para todos 08.- Fomentar el crecimiento económico sostenido, inclusivo y sostenible, el empleo pleno y productivo, y el trabajo decente para todos 09.- Desarrollar infraestructuras resilientes, promover la industrialización inclusiva y sostenible, y fomentar la innovación 16.- Promover sociedades pacíficas e inclusivas para el desarrollo sostenible, facilitar acceso a la justicia para todos y crear instituciones eficaces, responsables e inclusivas a todos los niveles 17.- Fortalecer los medios de ejecución y reavivar la alianza mundial para el desarrollo sostenible |
| Resumo: | [EN] Refractory high entropy alloys (RHEAs), particularly Ti¿Nb¿Zr¿Ta¿Mo, are promising materials because of their high mechanical properties at elevated temperatures. Although a unique solid-solution phase characterizes these materials, the dendrite structure exhibits a clear element segregation when prepared by liquid route, leading to a different composition between dendrite and interdendrite. This study investigates the local mechanical properties of dendritic and interdendritic regions and the effect of adding Mo on the segregation and hardness. Two alloy compositions, i.e., Ti25 Nb25 Zr25 Ta25 and Ti30 Nb20 Zr20Ta20 Mo10 (at.%), were produced by copper mold suction casting. Characterization was carried out by XRD, EBSD, and nanoindentation mapping. It was observed that Mo reduces the lattice difference between the dendrite and interdendrite; both play different roles during plastic deformation, as interdendrites accumulate higher dislocation density. The alloys did not show any strain hardening after the compression test. Finally, Mo plays a key role in increasing the mechanical properties by solid solution hardening. |
|---|