A multi-component diffusion multiple approach based synergistic regulation of γ' phase stability and mechanical properties in CoTiVNi-based superalloys
Enhanced fuel efficiency and engine performance have driven interest in Co-based superalloys reinforced by coherent γ′ dispersed in the matrix with low stacking fault energy (SFE). However, poor microstructure stability due to thermodynamically unstable γ′ phases limits their application. A (multi-c...
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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/S2238785425013286 |
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| author | J.J. Ruan H.C. Sun J.S. Yan S. Yang Y. Li Z.W. Zhang L.L. Zhu H. Zhang N. Ueshima K. Oikawa L. Jiang |
| author_facet | J.J. Ruan H.C. Sun J.S. Yan S. Yang Y. Li Z.W. Zhang L.L. Zhu H. Zhang N. Ueshima K. Oikawa L. Jiang |
| author_sort | J.J. Ruan |
| collection | DOAJ |
| description | Enhanced fuel efficiency and engine performance have driven interest in Co-based superalloys reinforced by coherent γ′ dispersed in the matrix with low stacking fault energy (SFE). However, poor microstructure stability due to thermodynamically unstable γ′ phases limits their application. A (multi-component diffusion multiple) MCDM approach was employed to efficiently explore composition-microstructure-property relationships of the novel Co–Ti–V–Ni alloys in the present work. Two alloy groups (A: high Ni, B: low Ni) with varying V/Ti ratios were designed, homogenized, and analyzed via EPMA, FE-SEM, in situ XRD, TEM, and mechanical testing. Results revealed that γ′ phase stability decreased with increasing Ni, contrasting prior studies where Ni improved γ′ stability in Al-containing systems. In situ XRD demonstrated temperature-dependent γ/γ′ lattice misfit, with Group A exhibiting higher misfits than Group B, and the lattice misfit decreased with rising V/Ti ratio. Alloy 4# showed anomalous strength increase at 750 °C, attributed to dislocation cross-slip. The deformation mechanisms of the alloy exhibit a temperature-dependent evolution: at room temperature, the matrix primarily undergoes deformation through SFs, Lomer-Cottrell locks (LCs), and HCP phase formation. As the temperature increases to 750 °C, deformation twins progressively dominate in the matrix. However, upon further heating to 800 °C, the deformation behavior reverts to a combination of SFs and LC locks as the primary mechanisms. SFE calculations indicated a high-temperature chemical segregation-assisted SF formation. This work highlights the efficiency of MCDM in alloy design and underscores the prominent roles of V in optimizing Co-based superalloys, providing insights for future development of thermally stable, high-performance materials. |
| format | Article |
| id | doaj-art-69a54b70ecc04a02b06aa41b7a9411a5 |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-69a54b70ecc04a02b06aa41b7a9411a52025-08-20T02:29:20ZengElsevierJournal of Materials Research and Technology2238-78542025-05-01369539954810.1016/j.jmrt.2025.05.172A multi-component diffusion multiple approach based synergistic regulation of γ' phase stability and mechanical properties in CoTiVNi-based superalloysJ.J. Ruan0H.C. Sun1J.S. Yan2S. Yang3Y. Li4Z.W. Zhang5L.L. Zhu6H. Zhang7N. Ueshima8K. Oikawa9L. Jiang10Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China; Shandong Key Laboratory of Advanced Structural Materials Genome Engineering, Yantai University, Yantai, 264005, China; Corresponding author. Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China.Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China; Shandong Key Laboratory of Advanced Structural Materials Genome Engineering, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China; Shandong Key Laboratory of Advanced Structural Materials Genome Engineering, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China; Shandong Key Laboratory of Advanced Structural Materials Genome Engineering, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China; Shandong Key Laboratory of Advanced Structural Materials Genome Engineering, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China; Shandong Key Laboratory of Advanced Structural Materials Genome Engineering, Yantai University, Yantai, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China; Shandong Key Laboratory of Advanced Structural Materials Genome Engineering, Yantai University, Yantai, 264005, China; Corresponding author. Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China.Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China; Shandong Key Laboratory of Advanced Structural Materials Genome Engineering, Yantai University, Yantai, 264005, ChinaDepartment of Metallurgy, Graduate School of Engineering, Tohoku University, Aramaki-aza Aoba 6-6-02, Aoba-ku, Sendai, 980-8579, JapanDepartment of Metallurgy, Graduate School of Engineering, Tohoku University, Aramaki-aza Aoba 6-6-02, Aoba-ku, Sendai, 980-8579, JapanInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China; Shandong Key Laboratory of Advanced Structural Materials Genome Engineering, Yantai University, Yantai, 264005, China; Corresponding author. Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China.Enhanced fuel efficiency and engine performance have driven interest in Co-based superalloys reinforced by coherent γ′ dispersed in the matrix with low stacking fault energy (SFE). However, poor microstructure stability due to thermodynamically unstable γ′ phases limits their application. A (multi-component diffusion multiple) MCDM approach was employed to efficiently explore composition-microstructure-property relationships of the novel Co–Ti–V–Ni alloys in the present work. Two alloy groups (A: high Ni, B: low Ni) with varying V/Ti ratios were designed, homogenized, and analyzed via EPMA, FE-SEM, in situ XRD, TEM, and mechanical testing. Results revealed that γ′ phase stability decreased with increasing Ni, contrasting prior studies where Ni improved γ′ stability in Al-containing systems. In situ XRD demonstrated temperature-dependent γ/γ′ lattice misfit, with Group A exhibiting higher misfits than Group B, and the lattice misfit decreased with rising V/Ti ratio. Alloy 4# showed anomalous strength increase at 750 °C, attributed to dislocation cross-slip. The deformation mechanisms of the alloy exhibit a temperature-dependent evolution: at room temperature, the matrix primarily undergoes deformation through SFs, Lomer-Cottrell locks (LCs), and HCP phase formation. As the temperature increases to 750 °C, deformation twins progressively dominate in the matrix. However, upon further heating to 800 °C, the deformation behavior reverts to a combination of SFs and LC locks as the primary mechanisms. SFE calculations indicated a high-temperature chemical segregation-assisted SF formation. This work highlights the efficiency of MCDM in alloy design and underscores the prominent roles of V in optimizing Co-based superalloys, providing insights for future development of thermally stable, high-performance materials.http://www.sciencedirect.com/science/article/pii/S2238785425013286SuperalloysHigh-throughput techniqueIn situ XRDDeformation mechanicsStacking fault energy |
| spellingShingle | J.J. Ruan H.C. Sun J.S. Yan S. Yang Y. Li Z.W. Zhang L.L. Zhu H. Zhang N. Ueshima K. Oikawa L. Jiang A multi-component diffusion multiple approach based synergistic regulation of γ' phase stability and mechanical properties in CoTiVNi-based superalloys Journal of Materials Research and Technology Superalloys High-throughput technique In situ XRD Deformation mechanics Stacking fault energy |
| title | A multi-component diffusion multiple approach based synergistic regulation of γ' phase stability and mechanical properties in CoTiVNi-based superalloys |
| title_full | A multi-component diffusion multiple approach based synergistic regulation of γ' phase stability and mechanical properties in CoTiVNi-based superalloys |
| title_fullStr | A multi-component diffusion multiple approach based synergistic regulation of γ' phase stability and mechanical properties in CoTiVNi-based superalloys |
| title_full_unstemmed | A multi-component diffusion multiple approach based synergistic regulation of γ' phase stability and mechanical properties in CoTiVNi-based superalloys |
| title_short | A multi-component diffusion multiple approach based synergistic regulation of γ' phase stability and mechanical properties in CoTiVNi-based superalloys |
| title_sort | multi component diffusion multiple approach based synergistic regulation of γ phase stability and mechanical properties in cotivni based superalloys |
| topic | Superalloys High-throughput technique In situ XRD Deformation mechanics Stacking fault energy |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425013286 |
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