Grain-boundary segregation and superior mechanical properties in a multicomponent L12 Ni46.5Co24Fe8Al12.5Ti9 superlattice alloy
Ni3Al superlattice alloys with the L12 structure have garnered much attention due to their attractive high-temperature mechanical properties; however, their grain-boundary brittleness and low ductility in the ambient temperature range have greatly restricted their widespread application. In this stu...
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Frontiers Media S.A.
2023-02-01
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| Series: | Frontiers in Materials |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmats.2023.1058762/full |
| _version_ | 1797897231604383744 |
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| author | Weihong Liu Keyu Chen Chunyan Yu |
| author_facet | Weihong Liu Keyu Chen Chunyan Yu |
| author_sort | Weihong Liu |
| collection | DOAJ |
| description | Ni3Al superlattice alloys with the L12 structure have garnered much attention due to their attractive high-temperature mechanical properties; however, their grain-boundary brittleness and low ductility in the ambient temperature range have greatly restricted their widespread application. In this study, we developed an L12 structure multicomponent Ni46.5Co24Fe8Al12.5Ti9 (at. %) superlattice alloy that notably suppressed the room-temperature intergranular brittleness and exhibited a large tensile elongation of 17.1% ± 5.2% together with a high ultimate tensile strength of 1,080.2 ± 57.4 MPa. Multiple microstructural examinations reveal an L12 equiaxed-grain microstructure, with the presence of a minor B2 phase. Moreover, the co-segregation of Fe and Co atoms, and the associated reduction or elimination of the L12 chemical order at the grain-boundary regions were characterized, which were proved to be the root cause of the suppression of intergranular brittleness and the high tensile ductility. Further theoretical calculations show that alloying of Fe and Co to binary Ni3Al reduced the ordering energy, which promoted intergranular segregation and associated disordering. This observation demonstrated that the elimination or reduction of interfacial chemical order is an effective ductilizing method for superlattice alloys. |
| first_indexed | 2024-04-10T07:54:15Z |
| format | Article |
| id | doaj.art-6c7094a8750c4d5ea580ec93f017db47 |
| institution | Directory Open Access Journal |
| issn | 2296-8016 |
| language | English |
| last_indexed | 2024-04-10T07:54:15Z |
| publishDate | 2023-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Materials |
| spelling | doaj.art-6c7094a8750c4d5ea580ec93f017db472023-02-23T05:48:25ZengFrontiers Media S.A.Frontiers in Materials2296-80162023-02-011010.3389/fmats.2023.10587621058762Grain-boundary segregation and superior mechanical properties in a multicomponent L12 Ni46.5Co24Fe8Al12.5Ti9 superlattice alloyWeihong Liu0Keyu Chen1Chunyan Yu2School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, ChinaCollege of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, ChinaNi3Al superlattice alloys with the L12 structure have garnered much attention due to their attractive high-temperature mechanical properties; however, their grain-boundary brittleness and low ductility in the ambient temperature range have greatly restricted their widespread application. In this study, we developed an L12 structure multicomponent Ni46.5Co24Fe8Al12.5Ti9 (at. %) superlattice alloy that notably suppressed the room-temperature intergranular brittleness and exhibited a large tensile elongation of 17.1% ± 5.2% together with a high ultimate tensile strength of 1,080.2 ± 57.4 MPa. Multiple microstructural examinations reveal an L12 equiaxed-grain microstructure, with the presence of a minor B2 phase. Moreover, the co-segregation of Fe and Co atoms, and the associated reduction or elimination of the L12 chemical order at the grain-boundary regions were characterized, which were proved to be the root cause of the suppression of intergranular brittleness and the high tensile ductility. Further theoretical calculations show that alloying of Fe and Co to binary Ni3Al reduced the ordering energy, which promoted intergranular segregation and associated disordering. This observation demonstrated that the elimination or reduction of interfacial chemical order is an effective ductilizing method for superlattice alloys.https://www.frontiersin.org/articles/10.3389/fmats.2023.1058762/fullsuperlattice alloysL12 chemical ordergrain-boundary brittlenessgrain-boundary segregationchemical disordering |
| spellingShingle | Weihong Liu Keyu Chen Chunyan Yu Grain-boundary segregation and superior mechanical properties in a multicomponent L12 Ni46.5Co24Fe8Al12.5Ti9 superlattice alloy Frontiers in Materials superlattice alloys L12 chemical order grain-boundary brittleness grain-boundary segregation chemical disordering |
| title | Grain-boundary segregation and superior mechanical properties in a multicomponent L12 Ni46.5Co24Fe8Al12.5Ti9 superlattice alloy |
| title_full | Grain-boundary segregation and superior mechanical properties in a multicomponent L12 Ni46.5Co24Fe8Al12.5Ti9 superlattice alloy |
| title_fullStr | Grain-boundary segregation and superior mechanical properties in a multicomponent L12 Ni46.5Co24Fe8Al12.5Ti9 superlattice alloy |
| title_full_unstemmed | Grain-boundary segregation and superior mechanical properties in a multicomponent L12 Ni46.5Co24Fe8Al12.5Ti9 superlattice alloy |
| title_short | Grain-boundary segregation and superior mechanical properties in a multicomponent L12 Ni46.5Co24Fe8Al12.5Ti9 superlattice alloy |
| title_sort | grain boundary segregation and superior mechanical properties in a multicomponent l12 ni46 5co24fe8al12 5ti9 superlattice alloy |
| topic | superlattice alloys L12 chemical order grain-boundary brittleness grain-boundary segregation chemical disordering |
| url | https://www.frontiersin.org/articles/10.3389/fmats.2023.1058762/full |
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