Strong and ductile CoCrFeNi high-entropy alloy microfibers at ambient and cryogenic temperatures
Exploring metallic microfibers with an excellent combination of high strength and ductility is a challenge for structural applications under extreme conditions. In this work, a heterogeneous gradient structure was introduced into CoCrFeNi high-entropy alloy (HEA) microfibers via thermomechanical pro...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127523006652 |
| _version_ | 1797671467656151040 |
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| author | Xiaoyu Gao Jian Liu Wujing Fu Yongjiang Huang Zhiliang Ning Zhixiong Zhang Jianfei Sun Wen Chen |
| author_facet | Xiaoyu Gao Jian Liu Wujing Fu Yongjiang Huang Zhiliang Ning Zhixiong Zhang Jianfei Sun Wen Chen |
| author_sort | Xiaoyu Gao |
| collection | DOAJ |
| description | Exploring metallic microfibers with an excellent combination of high strength and ductility is a challenge for structural applications under extreme conditions. In this work, a heterogeneous gradient structure was introduced into CoCrFeNi high-entropy alloy (HEA) microfibers via thermomechanical processing. The annealed CoCrFeNi microfiber displays an ultrahigh yield strength of ∼ 1 GPa, an ultimate tensile strength of 1.45 GPa, and an outstanding uniform elongation of 75% at 150 K. These excellent properties originate from the ultrafine grains and heterogeneous gradient structure, as well as the activation of multiple deformation mechanisms including deformation twins, dense dislocations, stacking faults, Lomer-Cottrell locks, phase transformation and 9R phase. Our work not only suggests that HEA microfibers have great potential for structural applications in cryogenic environments, but also sheds light on the design of advanced multi-component metallic microfibers with superior mechanical properties. |
| first_indexed | 2024-03-11T21:15:58Z |
| format | Article |
| id | doaj.art-722742ae9e8743f8a5b5af140effe7d5 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-03-11T21:15:58Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-722742ae9e8743f8a5b5af140effe7d52023-09-29T04:43:32ZengElsevierMaterials & Design0264-12752023-09-01233112250Strong and ductile CoCrFeNi high-entropy alloy microfibers at ambient and cryogenic temperaturesXiaoyu Gao0Jian Liu1Wujing Fu2Yongjiang Huang3Zhiliang Ning4Zhixiong Zhang5Jianfei Sun6Wen Chen7School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaDepartment of Mechanical and Industrial Engineering, University of Massachusetts Amherst, MA 01003, USASchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; Corresponding authors.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaCollege of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaDepartment of Mechanical and Industrial Engineering, University of Massachusetts Amherst, MA 01003, USA; Corresponding authors.Exploring metallic microfibers with an excellent combination of high strength and ductility is a challenge for structural applications under extreme conditions. In this work, a heterogeneous gradient structure was introduced into CoCrFeNi high-entropy alloy (HEA) microfibers via thermomechanical processing. The annealed CoCrFeNi microfiber displays an ultrahigh yield strength of ∼ 1 GPa, an ultimate tensile strength of 1.45 GPa, and an outstanding uniform elongation of 75% at 150 K. These excellent properties originate from the ultrafine grains and heterogeneous gradient structure, as well as the activation of multiple deformation mechanisms including deformation twins, dense dislocations, stacking faults, Lomer-Cottrell locks, phase transformation and 9R phase. Our work not only suggests that HEA microfibers have great potential for structural applications in cryogenic environments, but also sheds light on the design of advanced multi-component metallic microfibers with superior mechanical properties.http://www.sciencedirect.com/science/article/pii/S0264127523006652High entropy alloyMicrofiberMechanical propertiesCryogenic temperatureMicrostructure |
| spellingShingle | Xiaoyu Gao Jian Liu Wujing Fu Yongjiang Huang Zhiliang Ning Zhixiong Zhang Jianfei Sun Wen Chen Strong and ductile CoCrFeNi high-entropy alloy microfibers at ambient and cryogenic temperatures Materials & Design High entropy alloy Microfiber Mechanical properties Cryogenic temperature Microstructure |
| title | Strong and ductile CoCrFeNi high-entropy alloy microfibers at ambient and cryogenic temperatures |
| title_full | Strong and ductile CoCrFeNi high-entropy alloy microfibers at ambient and cryogenic temperatures |
| title_fullStr | Strong and ductile CoCrFeNi high-entropy alloy microfibers at ambient and cryogenic temperatures |
| title_full_unstemmed | Strong and ductile CoCrFeNi high-entropy alloy microfibers at ambient and cryogenic temperatures |
| title_short | Strong and ductile CoCrFeNi high-entropy alloy microfibers at ambient and cryogenic temperatures |
| title_sort | strong and ductile cocrfeni high entropy alloy microfibers at ambient and cryogenic temperatures |
| topic | High entropy alloy Microfiber Mechanical properties Cryogenic temperature Microstructure |
| url | http://www.sciencedirect.com/science/article/pii/S0264127523006652 |
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