Reaching unconventionally large Hall-Petch coefficients in face-centered cubic high-entropy alloys
| Autor: | Jiaxiang Li, Kenta Yamanaka, Yongjie Zhang, Tadashi Furuhara, Guoqin Cao, Junhua Hu, Akihiko Chiba |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Materials Research Letters, Vol 12, Iss 6, Pp 399-407 (2024) |
| Druh dokumentu: | article |
| ISSN: | 21663831 2166-3831 |
| DOI: | 10.1080/21663831.2024.2337211 |
| Popis: | ABSTRACTThe Hall-Petch strengthening coefficient of face-centered cubic alloys has the potential to increase. Herein, we experimentally determined an unconventionally large Hall-Petch coefficient equal to 1100 MPa·µm1/2 and a large lattice friction stress for novel Co0.95Cr0.8Fe0.25Ni1.8Mo0.475 high-entropy alloys (Mo0.475 HEAs). Detailed microstructural characterizations showed Mo segregation at grain boundaries (GBs) and no apparent nano-clustering in the matrix. With the increased Mo content, Mo segregating at GBs is an unexpected outcome. The unconventionally large Hall-Petch coefficient is ascribed to the newly generated effect due to Mo segregation at GBs, besides the factors in the grain interior, e.g. the increased solid-solution strengthening. This study is dedicated to enriching the diversity of Hall-Petch strengthening mechanisms for the development of high-strength materials. |
| Databáze: | Directory of Open Access Journals |
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