Exceptional superelasticity via heterogeneity-driven texture optimization in equiaxed CuAlMn alloys
Achieving high superelasticity in polycrystalline shape memory alloys is fundamentally limited by strain incompatibilities arising from grain orientation. Realizing high martensitic transformation strain ( ${\varepsilon _{{\text{TS}}}}$ ) orientations that are favorable for superelasticity in equiax...
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| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | Materials Futures |
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| Online Access: | https://doi.org/10.1088/2752-5724/adf3d1 |
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| author | Xinghao Li Ye Cui Guangda Zhao Lixin Sun Yang Zhang Zhongwu Zhang |
| author_facet | Xinghao Li Ye Cui Guangda Zhao Lixin Sun Yang Zhang Zhongwu Zhang |
| author_sort | Xinghao Li |
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| description | Achieving high superelasticity in polycrystalline shape memory alloys is fundamentally limited by strain incompatibilities arising from grain orientation. Realizing high martensitic transformation strain ( ${\varepsilon _{{\text{TS}}}}$ ) orientations that are favorable for superelasticity in equiaxed microstructures remains a major challenge. Here, a novel heterogeneity-driven texture optimization strategy is reported to enhance superelasticity in CuAlMn alloys through controlling high- ${\varepsilon _{{\text{TS}}}}$ orientations. Controlled deformation imprints dislocation density heterogeneity in differently oriented grains, leading to the gradients of sub-boundary energy. These gradients drive selective grain boundary migration, facilitating the preferential growth of grains with the high- ${\varepsilon _{{\text{TS}}}}$ <015> orientation. As a result, the fraction of <015>-oriented grains increases significantly from ∼19% to ∼70%, yielding a unprecedent tensile superelastic strain of ∼8.0% in equiaxed CuAlMn alloys, paving the way for practical engineering applications. This microstructural heterogeneity-guided strategy offers a general framework for overcoming texture-related limitations in polycrystalline functional materials. |
| format | Article |
| id | doaj-art-e5e9ea4f649d4b01b68341b3925bc75f |
| institution | Kabale University |
| issn | 2752-5724 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Futures |
| spelling | doaj-art-e5e9ea4f649d4b01b68341b3925bc75f2025-08-20T03:40:00ZengIOP PublishingMaterials Futures2752-57242025-01-014404500110.1088/2752-5724/adf3d1Exceptional superelasticity via heterogeneity-driven texture optimization in equiaxed CuAlMn alloysXinghao Li0Ye Cui1Guangda Zhao2Lixin Sun3Yang Zhang4Zhongwu Zhang5https://orcid.org/0000-0002-2874-2976College of Materials Science and Chemical Engineering, Harbin Engineering University , Harbin 150001, People’s Republic of ChinaCollege of Materials Science and Chemical Engineering, Harbin Engineering University , Harbin 150001, People’s Republic of ChinaCollege of Materials Science and Chemical Engineering, Harbin Engineering University , Harbin 150001, People’s Republic of ChinaCollege of Materials Science and Chemical Engineering, Harbin Engineering University , Harbin 150001, People’s Republic of ChinaCollege of Materials Science and Chemical Engineering, Harbin Engineering University , Harbin 150001, People’s Republic of ChinaCollege of Materials Science and Chemical Engineering, Harbin Engineering University , Harbin 150001, People’s Republic of ChinaAchieving high superelasticity in polycrystalline shape memory alloys is fundamentally limited by strain incompatibilities arising from grain orientation. Realizing high martensitic transformation strain ( ${\varepsilon _{{\text{TS}}}}$ ) orientations that are favorable for superelasticity in equiaxed microstructures remains a major challenge. Here, a novel heterogeneity-driven texture optimization strategy is reported to enhance superelasticity in CuAlMn alloys through controlling high- ${\varepsilon _{{\text{TS}}}}$ orientations. Controlled deformation imprints dislocation density heterogeneity in differently oriented grains, leading to the gradients of sub-boundary energy. These gradients drive selective grain boundary migration, facilitating the preferential growth of grains with the high- ${\varepsilon _{{\text{TS}}}}$ <015> orientation. As a result, the fraction of <015>-oriented grains increases significantly from ∼19% to ∼70%, yielding a unprecedent tensile superelastic strain of ∼8.0% in equiaxed CuAlMn alloys, paving the way for practical engineering applications. This microstructural heterogeneity-guided strategy offers a general framework for overcoming texture-related limitations in polycrystalline functional materials.https://doi.org/10.1088/2752-5724/adf3d1shape memory alloyssuperelasticitytexturegrain boundary migrationdislocation engineering |
| spellingShingle | Xinghao Li Ye Cui Guangda Zhao Lixin Sun Yang Zhang Zhongwu Zhang Exceptional superelasticity via heterogeneity-driven texture optimization in equiaxed CuAlMn alloys Materials Futures shape memory alloys superelasticity texture grain boundary migration dislocation engineering |
| title | Exceptional superelasticity via heterogeneity-driven texture optimization in equiaxed CuAlMn alloys |
| title_full | Exceptional superelasticity via heterogeneity-driven texture optimization in equiaxed CuAlMn alloys |
| title_fullStr | Exceptional superelasticity via heterogeneity-driven texture optimization in equiaxed CuAlMn alloys |
| title_full_unstemmed | Exceptional superelasticity via heterogeneity-driven texture optimization in equiaxed CuAlMn alloys |
| title_short | Exceptional superelasticity via heterogeneity-driven texture optimization in equiaxed CuAlMn alloys |
| title_sort | exceptional superelasticity via heterogeneity driven texture optimization in equiaxed cualmn alloys |
| topic | shape memory alloys superelasticity texture grain boundary migration dislocation engineering |
| url | https://doi.org/10.1088/2752-5724/adf3d1 |
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