Artículo
Mechanical Alloying as a Way to Produce Metastable Single-Phase High-Entropy Alloys beyond the Stability Criteria
Autor/es | Santiago Andrades, Lucía
Vidal Crespo, Antonio Blázquez Gámez, Javier Sebastián Ipus Bados, Jhon Jairo Conde Amiano, Clara Francisca |
Departamento | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2023-12 |
Fecha de depósito | 2023-12-29 |
Publicado en |
|
Resumen | Various stability criteria developed for high-entropy alloys are applied to compositions
produced by mechanical alloying. While they agree with the annealed samples, these criteria fail
to describe the as-milled metastable ... Various stability criteria developed for high-entropy alloys are applied to compositions produced by mechanical alloying. While they agree with the annealed samples, these criteria fail to describe the as-milled metastable systems, highlighting the ability of mechanical alloying to overcome the limitations imposed by these criteria. The criteria are based on atomic size (Ω ≥ 1.1 and δr ≤ 6.6%) and/or electronegativity misfit, as well as on mixing enthalpy (Λ > 0.95 J mol−1K −1 and −5 kJ mol−1 < ∆Hmix < 0), or purely thermodynamic (ϕYe > 20; ϕKing > 1; Te f f < 500 K). These criteria are applied to several compositions found in the literature and to two metastable fcc solid solutions produced by mechanical alloying with compositions Al0.75CoXFeNi with X = Cr and Mn. Single-phase microstructures are stable up to above 600 K, leading to more stable multiphase systems after annealing above this temperature. Mössbauer spectrometry shows that, whereas the alloy with Cr is paramagnetic in the as-milled and annealed state, the alloy with Mn changes from paramagnetic to ferromagnetic behavior (Curie temperature ~700 K) after annealing. Thermomagnetic experiments on annealed samples show for both compositions some hysteretic events at high temperatures (850 to 1000 K), probably ascribed to reversible ordering phenomena. |
Agencias financiadoras | Universidad de Sevilla |
Identificador del proyecto | USE VII-PPITU |
Cita | Santiago Andrades, L., Vidal Crespo, A., Blázquez Gámez, J.S., Ipus Bados, J.J. y Conde Amiano, C.F. (2023). Mechanical Alloying as a Way to Produce Metastable Single-Phase High-Entropy Alloys beyond the Stability Criteria. Nanomaterials, 14 (1), 27. https://doi.org/10.3390/nano14010027. |
Ficheros | Tamaño | Formato | Ver | Descripción |
---|---|---|---|---|
nanomaterials-14-00027-v2.pdf | 2.682Mb | [PDF] | Ver/ | |