Microstructural stability of the cocrfe2ni2 high entropy alloys with additions of cu and mo
New High Entropy Alloys based on the CoCrFeNi system have been developed by adding up to 10 at. % of Cu, Mo, and Cu + Mo in different amounts. These alloys showed a single face-centred cubic (FCC) structure after homogenization at 1200C. In order to evaluate their thermal stability, aging heat treat...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/265089 |
| Acceso en línea: | http://hdl.handle.net/10261/265089 |
| Access Level: | acceso abierto |
| Palabra clave: | High entropy alloys Alloy design Thermal treatments Microstructural characterization |
| Sumario: | New High Entropy Alloys based on the CoCrFeNi system have been developed by adding up to 10 at. % of Cu, Mo, and Cu + Mo in different amounts. These alloys showed a single face-centred cubic (FCC) structure after homogenization at 1200C. In order to evaluate their thermal stability, aging heat treatments at 500, 700, and 900C for 8 h were applied to study the possible precipitation phenomena. In the alloys where only Cu or Mo was added, we found the precipitation of an FCC Cu-rich phase or the µ phase rich in Mo, respectively, in agreement with some of the results previously shown in the literature. Nevertheless, we have observed that when both elements are present, Cu precipitation does not occur, and the formation of the Mo-rich phase is inhibited (or delayed). This is a surprising result as Cu and Mo have a positive enthalpy of mixing, being immiscible in a binary system, while added together they improve the stability of this system and maintain a single FCC crystal structure from medium to high temperatures. |
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