Ordered nitrogen complexes overcoming strength–ductility trade-off in an additively manufactured high-entropy alloy
| Title: | Ordered nitrogen complexes overcoming strength–ductility trade-off in an additively manufactured high-entropy alloy |
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| Authors: | Dandan Zhao, Quan Yang, Dawei Wang, Ming Yan, Pei Wang, Mingguang Jiang, Changyong Liu, Dongfeng Diao, Changshi Lao, Zhangwei Chen, Zhiyuan Liu, Yuan Wu, Zhaoping Lu |
| Source: | Virtual and Physical Prototyping, Vol 15, Iss S1, Pp 532-542 (2020) |
| Publisher Information: | Taylor & Francis Group, 2020. |
| Publication Year: | 2020 |
| Collection: | LCC:Science LCC:Manufactures |
| Subject Terms: | high-entropy alloys, laser powder bed fusion, reactive atmosphere, ordered nitrogen complexes, Science, Manufactures, TS1-2301 |
| More Details: | Strength and ductility were simultaneously enhanced in the additively manufactured CoCrFeMnNi high-entropy alloy by laser powder bed fusion (LBPF) under reactive N2 atmosphere. It was found that nitrogen atoms picked up during additive manufacturing line-up to form ordered nitrogen complexes (ONCs) in the octahedral interstitial position of the HEA matrix. Dislocation multiplication is then facilitated by the formation of ONCs during LPBF, leading to a higher dislocation density with smaller dislocation cells. Dislocation strengthening, combined with interstitial strengthening, endows the additively manufactured HEA with the yielding strength of 690 MPa, 15% higher than that of the counterparts fabricated under inert atmosphere. More interestingly, the ONCs stimulate dislocation nucleation and engender more heterogeneous microstructure, giving rise to an outstanding ductility of 15.3%, with an increment of 34%. As a result, the strength–ductility trade-off was successfully reversed by the nitrogen doping during LPBF under reactive atmosphere. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 1745-2759 1745-2767 17452759 |
| Relation: | https://doaj.org/toc/1745-2759; https://doaj.org/toc/1745-2767 |
| DOI: | 10.1080/17452759.2020.1840783 |
| Access URL: | https://doaj.org/article/2e4a8a1d98bc47c5afff90630f4ec7e2 |
| Accession Number: | edsdoj.2e4a8a1d98bc47c5afff90630f4ec7e2 |
| Database: | Directory of Open Access Journals |
| ISSN: | 17452759 17452767 |
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| DOI: | 10.1080/17452759.2020.1840783 |
| Published in: | Virtual and Physical Prototyping |
| Language: | English |