Production and characterization of the Cr35Fe35V16.5Mo6Ti7.5 high entropy alloy
The microstructure, thermal stability, and mechanical properties of a novel Cr35Fe35V16.5Mo6Ti7.5 high-entropy alloy were studied. The mechanical properties were mapped by nanoindentation, and the results correlated with the microstructure and the Vickers microhardness measurements. The alloy was pr...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-03-01
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| Series: | Nuclear Materials and Energy |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179122000357 |
| _version_ | 1819121670360662016 |
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| author | Y. Ortega M.A. Monge B. Savoini A. Muñoz P. Pérez |
| author_facet | Y. Ortega M.A. Monge B. Savoini A. Muñoz P. Pérez |
| author_sort | Y. Ortega |
| collection | DOAJ |
| description | The microstructure, thermal stability, and mechanical properties of a novel Cr35Fe35V16.5Mo6Ti7.5 high-entropy alloy were studied. The mechanical properties were mapped by nanoindentation, and the results correlated with the microstructure and the Vickers microhardness measurements. The alloy was produced by arc melting in a low pressure He atmosphere. Thermal treatments were performed to study the thermal stability of the alloy. The as-cast microstructure of the alloy exhibited a body-centered cubic phase with morphology of dendrites, outlined by a very thin interdendritic phase with a crystallographic structure compatible with Fe2Ti. The presence of the intermetallic particles was predicted by a free-energy based model, in contrast with the single solid solution alloy predicted by a parameter-based model. The volume fraction of the dendrites in the alloy is ∼ 94 % after arc melting. A small fraction of sparse Ti-rich particles, ∼0.4 vol%, was observed. The thermal treatments produced an increase of the population of Ti-rich particles, the formation of a σ-phase and nucleation of precipitates enriched with Fe and Ti into the previous dendrites. The material in as-cast condition exhibited a microhardness value of 6.2 ± 0.3 GPa, while the alloy aged at 960 °C resulted in 7.1 ± 0.4 GPa. Nanoindentations maps showed an excellent correlation with the microstructure, and their statistical analyses yielded a nanohardness mean value of 8.2 ± 0.4 GPa in the dendritic BCC regions of the as-cast and thermal treated samples and 14.1 ± 0.6 GPa for the σ-phase. The onset of the plastic behavior has been studied by analyzing the pop-in phenomenon observed in the nanoindentation loading curves. For the as-cast alloy, this analysis showed that the elastic-to-plastic transition seems to be triggered by dislocation nucleation. The alloy has a low thermal diffusivity in the measured temperature range that increases on increasing temperature. |
| first_indexed | 2024-12-22T06:40:15Z |
| format | Article |
| id | doaj.art-7201d74d0ff84bf0a35d65363a6a221a |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-12-22T06:40:15Z |
| publishDate | 2022-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-7201d74d0ff84bf0a35d65363a6a221a2022-12-21T18:35:26ZengElsevierNuclear Materials and Energy2352-17912022-03-0130101148Production and characterization of the Cr35Fe35V16.5Mo6Ti7.5 high entropy alloyY. Ortega0M.A. Monge1B. Savoini2A. Muñoz3P. Pérez4Universidad Complutense de Madrid, Facultad de CC. Físicas, Dpto. Física de Materiales, Plz. de Ciencias 1, Ciudad Universitaria 28040, Madrid, SpainUniversidad Carlos III de Madrid, Dpto. de Física, Avda. de la Universidad 30, Leganés 28911, Spain; Corresponding author.Universidad Carlos III de Madrid, Dpto. de Física, Avda. de la Universidad 30, Leganés 28911, SpainUniversidad Carlos III de Madrid, Dpto. de Física, Avda. de la Universidad 30, Leganés 28911, SpainCentro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Departamento de Metalurgia Física, Avd. Gregorio del Amo 8, 28040 Madrid, SpainThe microstructure, thermal stability, and mechanical properties of a novel Cr35Fe35V16.5Mo6Ti7.5 high-entropy alloy were studied. The mechanical properties were mapped by nanoindentation, and the results correlated with the microstructure and the Vickers microhardness measurements. The alloy was produced by arc melting in a low pressure He atmosphere. Thermal treatments were performed to study the thermal stability of the alloy. The as-cast microstructure of the alloy exhibited a body-centered cubic phase with morphology of dendrites, outlined by a very thin interdendritic phase with a crystallographic structure compatible with Fe2Ti. The presence of the intermetallic particles was predicted by a free-energy based model, in contrast with the single solid solution alloy predicted by a parameter-based model. The volume fraction of the dendrites in the alloy is ∼ 94 % after arc melting. A small fraction of sparse Ti-rich particles, ∼0.4 vol%, was observed. The thermal treatments produced an increase of the population of Ti-rich particles, the formation of a σ-phase and nucleation of precipitates enriched with Fe and Ti into the previous dendrites. The material in as-cast condition exhibited a microhardness value of 6.2 ± 0.3 GPa, while the alloy aged at 960 °C resulted in 7.1 ± 0.4 GPa. Nanoindentations maps showed an excellent correlation with the microstructure, and their statistical analyses yielded a nanohardness mean value of 8.2 ± 0.4 GPa in the dendritic BCC regions of the as-cast and thermal treated samples and 14.1 ± 0.6 GPa for the σ-phase. The onset of the plastic behavior has been studied by analyzing the pop-in phenomenon observed in the nanoindentation loading curves. For the as-cast alloy, this analysis showed that the elastic-to-plastic transition seems to be triggered by dislocation nucleation. The alloy has a low thermal diffusivity in the measured temperature range that increases on increasing temperature.http://www.sciencedirect.com/science/article/pii/S2352179122000357High entropy alloysComplex alloysThermal diffusivityNanoindentationAlloys |
| spellingShingle | Y. Ortega M.A. Monge B. Savoini A. Muñoz P. Pérez Production and characterization of the Cr35Fe35V16.5Mo6Ti7.5 high entropy alloy Nuclear Materials and Energy High entropy alloys Complex alloys Thermal diffusivity Nanoindentation Alloys |
| title | Production and characterization of the Cr35Fe35V16.5Mo6Ti7.5 high entropy alloy |
| title_full | Production and characterization of the Cr35Fe35V16.5Mo6Ti7.5 high entropy alloy |
| title_fullStr | Production and characterization of the Cr35Fe35V16.5Mo6Ti7.5 high entropy alloy |
| title_full_unstemmed | Production and characterization of the Cr35Fe35V16.5Mo6Ti7.5 high entropy alloy |
| title_short | Production and characterization of the Cr35Fe35V16.5Mo6Ti7.5 high entropy alloy |
| title_sort | production and characterization of the cr35fe35v16 5mo6ti7 5 high entropy alloy |
| topic | High entropy alloys Complex alloys Thermal diffusivity Nanoindentation Alloys |
| url | http://www.sciencedirect.com/science/article/pii/S2352179122000357 |
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