High-throughput screening of MoNbTaW-based Refractory High-Entropy Alloys through Direct Energy Deposition in-situ alloying

• Tipo: Artigo em Revista Científica Internacional
• Data: 2024

Autores

Ribeiro, BL (Autor) Outra; Monclús, MA (Autor) Outra; Barbosa, M (Autor) Outra; Torralba, JM (Autor) Outra; Malheiros, LF (Autor) Outra; Santos, RF (Autor) Outra; E. W. Sequeiros (Autor) FEUP

Revista

Título: Materials Characterization

Vol. 217

ISSN: 1044-5803

Editora: Elsevier

Indexação

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Scopus - 0 Citações

Outras Informações

ID Authenticus: P-017-47C

DOI: 10.1016/j.matchar.2024.114346

Abstract (EN): Refractory High-Entropy Alloys (RHEAs) have been presented as attractive materials for high-temperature applications, such as combustion engines for the aerospace sector, due to the possible service temperature increase, which can result in superior yield of the combustion itself. This work presents the combination of CALPHAD simulations with the in-situ alloying of the MoNbTaW system by Direct Energy Deposition (DED) for a high-throughput screening of RHEAs. CALPHAD simulations show that the addition of V and Ti allows a single-phase BCC structure to be kept. For the DED setup available, MoNbTaW single-track deposits were optimised through Response Surface Methodology. Afterwards, in-situ alloying with V was conducted. Microstructural characterisation was assessed at room temperature through SEM/EDS, and the mechanical characterisation was performed at room temperature (RT), 350 degrees C and 700 degrees C, through nanoindentation tests. The microstructural characterisation shows that alloying up to 40 at.% V to the base system allows to keep a single-phase structure; however, some segregations are observed. Mechanical characterisation revealed that V alloying of 22 % promotes a 93 % increase in hardness at RT and a 150 % increase at 700 degrees C. This study contributes to increasing the practical knowledge of RHEAs, thus accelerating the application of these alloys in aerospace applications.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 17