Achieving excellent strength-ductility synergy by adding carbon to a BCC structured low-cost Fe-based medium entropy alloy
The microstructure and tensile properties of C-doped Fe-based medium entropy alloys with a single BCC structure were studied in this work. The addition of 0.25 at.% and 0.5 at.% C induces a significant transformation of the Fe64Ni11Cr15Si7Al3 alloy from a single-phase BCC to a dual-phase FCC + BCC s...
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Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425011913 |
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| author | Chengfu Han Zhenyu Du Suo Zhang Zhenyan Zhang Shaojie Wu Tan Wang Yongfu Cai Chen Chen Ran Wei Fushan Li |
| author_facet | Chengfu Han Zhenyu Du Suo Zhang Zhenyan Zhang Shaojie Wu Tan Wang Yongfu Cai Chen Chen Ran Wei Fushan Li |
| author_sort | Chengfu Han |
| collection | DOAJ |
| description | The microstructure and tensile properties of C-doped Fe-based medium entropy alloys with a single BCC structure were studied in this work. The addition of 0.25 at.% and 0.5 at.% C induces a significant transformation of the Fe64Ni11Cr15Si7Al3 alloy from a single-phase BCC to a dual-phase FCC + BCC structure, accompanied by the precipitation of B2 (NiAl) nanoparticles within the BCC phase. Following thermomechanical treatment, the (Fe64Ni11Cr15Si7Al3)99.75C0.25 alloy shows excellent tensile properties at 77 K, achieving a yield strength (YS) of 1550 ± 34 MPa, ultimate tensile strength (UTS) of 1926 ± 33 MPa, and uniform elongation (UE) of 25 ± 6 %. These properties are attributed to ultrafine grains, carbon solution, high-density dislocations, B2 (NiAl) nano precipitates, and transformation - induced plasticity (TRIP). At 298 K, the same alloy retains substantial mechanical performance with a YS of 1054 ± 14 MPa, UTS of 1203 ± 6 MPa, and UE of 15 ± 1 %, without the TRIP effect. In contrast, the (Fe64Ni11Cr15Si7Al3)99.5C0.5 alloy exhibits sudden fracture at 77 K, likely due to carbide formation. This work provides a novel strategy for overcoming cold working challenges in single BCC alloys, thereby promoting their development and potential applications in structural materials. |
| format | Article |
| id | doaj-art-c2bfe5a7cab24b058ef0789df5dfdf8c |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-05-01 |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-c2bfe5a7cab24b058ef0789df5dfdf8c2025-08-20T01:50:49ZengElsevierJournal of Materials Research and Technology2238-78542025-05-01367913792410.1016/j.jmrt.2025.05.037Achieving excellent strength-ductility synergy by adding carbon to a BCC structured low-cost Fe-based medium entropy alloyChengfu Han0Zhenyu Du1Suo Zhang2Zhenyan Zhang3Shaojie Wu4Tan Wang5Yongfu Cai6Chen Chen7Ran Wei8Fushan Li9School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, ChinaSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, ChinaSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, ChinaSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, ChinaSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, ChinaSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, ChinaSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, ChinaCorresponding author.; School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, ChinaCorresponding author.; School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, ChinaCorresponding author.; School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, ChinaThe microstructure and tensile properties of C-doped Fe-based medium entropy alloys with a single BCC structure were studied in this work. The addition of 0.25 at.% and 0.5 at.% C induces a significant transformation of the Fe64Ni11Cr15Si7Al3 alloy from a single-phase BCC to a dual-phase FCC + BCC structure, accompanied by the precipitation of B2 (NiAl) nanoparticles within the BCC phase. Following thermomechanical treatment, the (Fe64Ni11Cr15Si7Al3)99.75C0.25 alloy shows excellent tensile properties at 77 K, achieving a yield strength (YS) of 1550 ± 34 MPa, ultimate tensile strength (UTS) of 1926 ± 33 MPa, and uniform elongation (UE) of 25 ± 6 %. These properties are attributed to ultrafine grains, carbon solution, high-density dislocations, B2 (NiAl) nano precipitates, and transformation - induced plasticity (TRIP). At 298 K, the same alloy retains substantial mechanical performance with a YS of 1054 ± 14 MPa, UTS of 1203 ± 6 MPa, and UE of 15 ± 1 %, without the TRIP effect. In contrast, the (Fe64Ni11Cr15Si7Al3)99.5C0.5 alloy exhibits sudden fracture at 77 K, likely due to carbide formation. This work provides a novel strategy for overcoming cold working challenges in single BCC alloys, thereby promoting their development and potential applications in structural materials.http://www.sciencedirect.com/science/article/pii/S2238785425011913C-dopingFe-based medium entropy alloyDual-phaseB2 precipitationsTensile properties |
| spellingShingle | Chengfu Han Zhenyu Du Suo Zhang Zhenyan Zhang Shaojie Wu Tan Wang Yongfu Cai Chen Chen Ran Wei Fushan Li Achieving excellent strength-ductility synergy by adding carbon to a BCC structured low-cost Fe-based medium entropy alloy Journal of Materials Research and Technology C-doping Fe-based medium entropy alloy Dual-phase B2 precipitations Tensile properties |
| title | Achieving excellent strength-ductility synergy by adding carbon to a BCC structured low-cost Fe-based medium entropy alloy |
| title_full | Achieving excellent strength-ductility synergy by adding carbon to a BCC structured low-cost Fe-based medium entropy alloy |
| title_fullStr | Achieving excellent strength-ductility synergy by adding carbon to a BCC structured low-cost Fe-based medium entropy alloy |
| title_full_unstemmed | Achieving excellent strength-ductility synergy by adding carbon to a BCC structured low-cost Fe-based medium entropy alloy |
| title_short | Achieving excellent strength-ductility synergy by adding carbon to a BCC structured low-cost Fe-based medium entropy alloy |
| title_sort | achieving excellent strength ductility synergy by adding carbon to a bcc structured low cost fe based medium entropy alloy |
| topic | C-doping Fe-based medium entropy alloy Dual-phase B2 precipitations Tensile properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425011913 |
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