A Review on the High Temperature Strengthening Mechanisms of High Entropy Superalloys (HESA)
The studies following HEA inceptions were apparently motivated to search for single-phase solid solution over intermetallic phases, accordingly made possible by the concept of high configurational entropy. However, it was realised that the formation of intermetallic phases in HEAs is prevalent due t...
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| Format: | Article |
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MDPI AG
2021-10-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/19/5835 |
| _version_ | 1797516040916172800 |
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| author | Malefane Joele Wallace Rwisayi Matizamhuka |
| author_facet | Malefane Joele Wallace Rwisayi Matizamhuka |
| author_sort | Malefane Joele |
| collection | DOAJ |
| description | The studies following HEA inceptions were apparently motivated to search for single-phase solid solution over intermetallic phases, accordingly made possible by the concept of high configurational entropy. However, it was realised that the formation of intermetallic phases in HEAs is prevalent due to other criterions that determine stable phases. Nonetheless, recent efforts have been directed towards attributes of microstructural combinations. In this viewpoint, the techniques used to predict microstructural features and methods of microstructural characterisation are elucidated in HESA fields. The study further analyses shortcomings regarding the design approaches of HESAs. A brief history is given into how HESAs were developed since their birth, to emphasize the evaluation techniques used to elucidate high temperature properties of HESAs, and the incentive thereof that enabled further pursuit of HESAs in the direction of optimal microstructure and composition. The theoretical models of strengthening mechanisms in HEAs are explained. The impact of processing route on the HESAs performance is analysed from previous studies. Thereafter, the future of HESAs in the market is conveyed from scientific opinion. Previous designs of HEAs/HESAs were more based on evaluation experiments, which lead to an extended period of research and considerable use of resources; currently, more effort is directed towards computational and theoretical methods to accelerate the exploration of huge HEA composition space. |
| first_indexed | 2024-03-10T06:55:44Z |
| format | Article |
| id | doaj.art-270a367c31aa4eb4adf2aa1a02b44e53 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T06:55:44Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-270a367c31aa4eb4adf2aa1a02b44e532023-11-22T16:27:52ZengMDPI AGMaterials1996-19442021-10-011419583510.3390/ma14195835A Review on the High Temperature Strengthening Mechanisms of High Entropy Superalloys (HESA)Malefane Joele0Wallace Rwisayi Matizamhuka1Department of Chemical and Metallurgical Engineering, Vaal University of Technology, Vanderbijlpark 1911, South AfricaDepartment of Chemical and Metallurgical Engineering, Vaal University of Technology, Vanderbijlpark 1911, South AfricaThe studies following HEA inceptions were apparently motivated to search for single-phase solid solution over intermetallic phases, accordingly made possible by the concept of high configurational entropy. However, it was realised that the formation of intermetallic phases in HEAs is prevalent due to other criterions that determine stable phases. Nonetheless, recent efforts have been directed towards attributes of microstructural combinations. In this viewpoint, the techniques used to predict microstructural features and methods of microstructural characterisation are elucidated in HESA fields. The study further analyses shortcomings regarding the design approaches of HESAs. A brief history is given into how HESAs were developed since their birth, to emphasize the evaluation techniques used to elucidate high temperature properties of HESAs, and the incentive thereof that enabled further pursuit of HESAs in the direction of optimal microstructure and composition. The theoretical models of strengthening mechanisms in HEAs are explained. The impact of processing route on the HESAs performance is analysed from previous studies. Thereafter, the future of HESAs in the market is conveyed from scientific opinion. Previous designs of HEAs/HESAs were more based on evaluation experiments, which lead to an extended period of research and considerable use of resources; currently, more effort is directed towards computational and theoretical methods to accelerate the exploration of huge HEA composition space.https://www.mdpi.com/1996-1944/14/19/5835strengthening mechanismshigh entropy superalloyssolid solutionconfiguration entropythermodynamic of phase stabilities |
| spellingShingle | Malefane Joele Wallace Rwisayi Matizamhuka A Review on the High Temperature Strengthening Mechanisms of High Entropy Superalloys (HESA) Materials strengthening mechanisms high entropy superalloys solid solution configuration entropy thermodynamic of phase stabilities |
| title | A Review on the High Temperature Strengthening Mechanisms of High Entropy Superalloys (HESA) |
| title_full | A Review on the High Temperature Strengthening Mechanisms of High Entropy Superalloys (HESA) |
| title_fullStr | A Review on the High Temperature Strengthening Mechanisms of High Entropy Superalloys (HESA) |
| title_full_unstemmed | A Review on the High Temperature Strengthening Mechanisms of High Entropy Superalloys (HESA) |
| title_short | A Review on the High Temperature Strengthening Mechanisms of High Entropy Superalloys (HESA) |
| title_sort | review on the high temperature strengthening mechanisms of high entropy superalloys hesa |
| topic | strengthening mechanisms high entropy superalloys solid solution configuration entropy thermodynamic of phase stabilities |
| url | https://www.mdpi.com/1996-1944/14/19/5835 |
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