γ′′ Phase transformation, precipitation hardening, hetero-deformation induced hardening and deformation mechanisms in a Nb-alloyed medium-entropy alloy
In present work, a novel γ′′-strengthened Nb-alloyed medium-entropy alloy (MEA) was successfully fabricated and systematically investigated. Our results evidence that the γ′′ phase brings out significant precipitation hardening effect (∼10.2 %volume fraction contributes ∼ 685 MPa strength enhancemen...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-01-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127522011005 |
| _version_ | 1811175478004809728 |
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| author | Wenjie Lu Xian Luo Yafeng Wang Bin Huang Zhijun Wang Yanqing Yang |
| author_facet | Wenjie Lu Xian Luo Yafeng Wang Bin Huang Zhijun Wang Yanqing Yang |
| author_sort | Wenjie Lu |
| collection | DOAJ |
| description | In present work, a novel γ′′-strengthened Nb-alloyed medium-entropy alloy (MEA) was successfully fabricated and systematically investigated. Our results evidence that the γ′′ phase brings out significant precipitation hardening effect (∼10.2 %volume fraction contributes ∼ 685 MPa strength enhancement). The metastable γ′′ phase could abnormally transform to ε phase, and the morphology and distribution of ε phase shows great impacts on mechanical properties. A hetero-lamellae grain coupling with dual-precipitation (HLG + dual-P) structure was successfully constructed in this Nb-alloyed MEA, which could effectively combine precipitation hardening and hetero-deformation induced (HDI) hardening effects. Deformation characters investigations reveals that the absence of mechanical twinning in γ′′-strengthened MEA originates from the improved critical twinning stress related to the fine dislocation source size and the difficulty of high-energy complex SFs reordering. The combination of massive stacking-faults, Lomer-Cottrell locks and dynamically reinforced HDI hardening contribute to the excellent ductility and work-hardening capacity at high-level strength in the HLG + dual-P structural alloy. Our work provides a useful insight and helpful guidance for developing high-performance precipitation-hardened multi-principal element alloys. |
| first_indexed | 2024-04-10T19:37:40Z |
| format | Article |
| id | doaj.art-658758fbc4464aaa9e3dfe48d7f0bdaa |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-10T19:37:40Z |
| publishDate | 2023-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-658758fbc4464aaa9e3dfe48d7f0bdaa2023-01-30T04:12:07ZengElsevierMaterials & Design0264-12752023-01-01225111477γ′′ Phase transformation, precipitation hardening, hetero-deformation induced hardening and deformation mechanisms in a Nb-alloyed medium-entropy alloyWenjie Lu0Xian Luo1Yafeng Wang2Bin Huang3Zhijun Wang4Yanqing Yang5State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR China; Langu Institute for Materials Analysis Co. Ltd, Weihai 264207, PR ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR China; Corresponding authors.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR China; Langu Institute for Materials Analysis Co. Ltd, Weihai 264207, PR China; Corresponding authors.In present work, a novel γ′′-strengthened Nb-alloyed medium-entropy alloy (MEA) was successfully fabricated and systematically investigated. Our results evidence that the γ′′ phase brings out significant precipitation hardening effect (∼10.2 %volume fraction contributes ∼ 685 MPa strength enhancement). The metastable γ′′ phase could abnormally transform to ε phase, and the morphology and distribution of ε phase shows great impacts on mechanical properties. A hetero-lamellae grain coupling with dual-precipitation (HLG + dual-P) structure was successfully constructed in this Nb-alloyed MEA, which could effectively combine precipitation hardening and hetero-deformation induced (HDI) hardening effects. Deformation characters investigations reveals that the absence of mechanical twinning in γ′′-strengthened MEA originates from the improved critical twinning stress related to the fine dislocation source size and the difficulty of high-energy complex SFs reordering. The combination of massive stacking-faults, Lomer-Cottrell locks and dynamically reinforced HDI hardening contribute to the excellent ductility and work-hardening capacity at high-level strength in the HLG + dual-P structural alloy. Our work provides a useful insight and helpful guidance for developing high-performance precipitation-hardened multi-principal element alloys.http://www.sciencedirect.com/science/article/pii/S0264127522011005Medium-entropy alloyγ′′ phasePrecipitation behaviorPrecipitation hardeningHetero-deformation induced hardening |
| spellingShingle | Wenjie Lu Xian Luo Yafeng Wang Bin Huang Zhijun Wang Yanqing Yang γ′′ Phase transformation, precipitation hardening, hetero-deformation induced hardening and deformation mechanisms in a Nb-alloyed medium-entropy alloy Materials & Design Medium-entropy alloy γ′′ phase Precipitation behavior Precipitation hardening Hetero-deformation induced hardening |
| title | γ′′ Phase transformation, precipitation hardening, hetero-deformation induced hardening and deformation mechanisms in a Nb-alloyed medium-entropy alloy |
| title_full | γ′′ Phase transformation, precipitation hardening, hetero-deformation induced hardening and deformation mechanisms in a Nb-alloyed medium-entropy alloy |
| title_fullStr | γ′′ Phase transformation, precipitation hardening, hetero-deformation induced hardening and deformation mechanisms in a Nb-alloyed medium-entropy alloy |
| title_full_unstemmed | γ′′ Phase transformation, precipitation hardening, hetero-deformation induced hardening and deformation mechanisms in a Nb-alloyed medium-entropy alloy |
| title_short | γ′′ Phase transformation, precipitation hardening, hetero-deformation induced hardening and deformation mechanisms in a Nb-alloyed medium-entropy alloy |
| title_sort | γ phase transformation precipitation hardening hetero deformation induced hardening and deformation mechanisms in a nb alloyed medium entropy alloy |
| topic | Medium-entropy alloy γ′′ phase Precipitation behavior Precipitation hardening Hetero-deformation induced hardening |
| url | http://www.sciencedirect.com/science/article/pii/S0264127522011005 |
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