Atomic-scale understanding of the effects of Cr and Ti on γ′ growth kinetics in the Ni–Al-X ternary system: Diffusion couple technique and DFT study
Cr and Ti are essential elements in Ni-based superalloys for γ solid solution strengthening and γ′ precipitation strengthening, respectively, enhancing high-temperature performance. Despite the known benefits of high concentrations, the effects of lower Cr and Ti concentrations on γ′ precipitation k...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425000973 |
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| author | Xinyu Gao Yuan Tian Xin Wen Shichang Qiao Fengzhen Wang Na Li Zhikang Xia Yongqianag Wang Shuai Liu Chao Yuan |
| author_facet | Xinyu Gao Yuan Tian Xin Wen Shichang Qiao Fengzhen Wang Na Li Zhikang Xia Yongqianag Wang Shuai Liu Chao Yuan |
| author_sort | Xinyu Gao |
| collection | DOAJ |
| description | Cr and Ti are essential elements in Ni-based superalloys for γ solid solution strengthening and γ′ precipitation strengthening, respectively, enhancing high-temperature performance. Despite the known benefits of high concentrations, the effects of lower Cr and Ti concentrations on γ′ precipitation kinetics remain unclear. This study investigates the temporal evolution of γ′ phase in Ni–Al-X (X = Cr, Ti) system, utilizing diffusion-couple alongside aberration-corrected transmission electron microscopy to unveil atomic-scale effects. Experimental results demonstrate that Cr and Ti accelerate γ′ phase formation due to competition between lattice misfit and interdiffusion. Moreover, γ′ phase forms through an order-disorder transition, regulated by alloy type. First-principles calculations indicate that Cr and Ti favor γ′ phase formation thermodynamically and kinetically. Al compressibility from Cr and Ti doping promotes γ′ formation. These insights aid in designing Ni-based superalloys with improved microstructural stability and high-temperature performance. |
| format | Article |
| id | doaj-art-3f73dbcee3164e368558848676e39106 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-3f73dbcee3164e368558848676e391062025-01-20T04:17:30ZengElsevierJournal of Materials Research and Technology2238-78542025-03-013513111322Atomic-scale understanding of the effects of Cr and Ti on γ′ growth kinetics in the Ni–Al-X ternary system: Diffusion couple technique and DFT studyXinyu Gao0Yuan Tian1Xin Wen2Shichang Qiao3Fengzhen Wang4Na Li5Zhikang Xia6Yongqianag Wang7Shuai Liu8Chao Yuan9School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaSchool of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; Corresponding author.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; Corresponding author. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China.Cr and Ti are essential elements in Ni-based superalloys for γ solid solution strengthening and γ′ precipitation strengthening, respectively, enhancing high-temperature performance. Despite the known benefits of high concentrations, the effects of lower Cr and Ti concentrations on γ′ precipitation kinetics remain unclear. This study investigates the temporal evolution of γ′ phase in Ni–Al-X (X = Cr, Ti) system, utilizing diffusion-couple alongside aberration-corrected transmission electron microscopy to unveil atomic-scale effects. Experimental results demonstrate that Cr and Ti accelerate γ′ phase formation due to competition between lattice misfit and interdiffusion. Moreover, γ′ phase forms through an order-disorder transition, regulated by alloy type. First-principles calculations indicate that Cr and Ti favor γ′ phase formation thermodynamically and kinetically. Al compressibility from Cr and Ti doping promotes γ′ formation. These insights aid in designing Ni-based superalloys with improved microstructural stability and high-temperature performance.http://www.sciencedirect.com/science/article/pii/S2238785425000973Ni-based alloyDiffusion couplePrecipitation kineticSolid state phase transformationFirst-principles |
| spellingShingle | Xinyu Gao Yuan Tian Xin Wen Shichang Qiao Fengzhen Wang Na Li Zhikang Xia Yongqianag Wang Shuai Liu Chao Yuan Atomic-scale understanding of the effects of Cr and Ti on γ′ growth kinetics in the Ni–Al-X ternary system: Diffusion couple technique and DFT study Journal of Materials Research and Technology Ni-based alloy Diffusion couple Precipitation kinetic Solid state phase transformation First-principles |
| title | Atomic-scale understanding of the effects of Cr and Ti on γ′ growth kinetics in the Ni–Al-X ternary system: Diffusion couple technique and DFT study |
| title_full | Atomic-scale understanding of the effects of Cr and Ti on γ′ growth kinetics in the Ni–Al-X ternary system: Diffusion couple technique and DFT study |
| title_fullStr | Atomic-scale understanding of the effects of Cr and Ti on γ′ growth kinetics in the Ni–Al-X ternary system: Diffusion couple technique and DFT study |
| title_full_unstemmed | Atomic-scale understanding of the effects of Cr and Ti on γ′ growth kinetics in the Ni–Al-X ternary system: Diffusion couple technique and DFT study |
| title_short | Atomic-scale understanding of the effects of Cr and Ti on γ′ growth kinetics in the Ni–Al-X ternary system: Diffusion couple technique and DFT study |
| title_sort | atomic scale understanding of the effects of cr and ti on γ growth kinetics in the ni al x ternary system diffusion couple technique and dft study |
| topic | Ni-based alloy Diffusion couple Precipitation kinetic Solid state phase transformation First-principles |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425000973 |
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