Refinement of αs phase and formation of nano-twins of Ti–7Mo–4Al–3Nb–2Cr alloyed by Zr element
To refine the αs phase and form the nano twins, different contents of Zr were added to as-cast Ti–7Mo–4Al–3Nb–2Cr-xZr alloys. Phase and microstructure evolution, mechanical properties and related mechanisms were systematically studied. Results show that as the Zr increases from 0 to 8 wt%, only α an...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422016684 |
| _version_ | 1797980407492247552 |
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| author | Yili Li Hongze Fang Shichen Sun Xiaofu Zhang Xiang Xue Ruirun Chen |
| author_facet | Yili Li Hongze Fang Shichen Sun Xiaofu Zhang Xiang Xue Ruirun Chen |
| author_sort | Yili Li |
| collection | DOAJ |
| description | To refine the αs phase and form the nano twins, different contents of Zr were added to as-cast Ti–7Mo–4Al–3Nb–2Cr-xZr alloys. Phase and microstructure evolution, mechanical properties and related mechanisms were systematically studied. Results show that as the Zr increases from 0 to 8 wt%, only α and β phases exist and the peak of β (110) shifts from 39.5 to 39.1° by XRD. The volume fraction of the αs phase changes from 75.4 to 73.9%, and its length decreases from 0.62 to 0.22 μm. More dislocations appear in the α/β interface and the growth twin of {10 1¯ 1}α < 11 2¯ 0> type with a width of ∼20 nm forms in α phase as observed by TEM. The refinement of the αs phase is due to the addition of Zr to promote nucleation and inhibit the growth rate. With increasing Zr content from 0 to 8 wt%, the strength increases from 961 to 1303 MPa, while the toughness decreases from 77 to 62 MPa m1/2. The fracture toughness decreases by 19.5%, while the strength increases by 35.6%. The refinement of αs phase, the solubilization of the Zr in the matrix, the increase of dislocation in the α/β interface, and the formation of nano twins are the main reasons for improving the strength and toughness of the studied alloys. |
| first_indexed | 2024-04-11T05:53:53Z |
| format | Article |
| id | doaj.art-0d9b8072f6454c27acf5ddaa05a400d5 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-11T05:53:53Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-0d9b8072f6454c27acf5ddaa05a400d52022-12-22T04:41:58ZengElsevierJournal of Materials Research and Technology2238-78542022-11-012133433356Refinement of αs phase and formation of nano-twins of Ti–7Mo–4Al–3Nb–2Cr alloyed by Zr elementYili Li0Hongze Fang1Shichen Sun2Xiaofu Zhang3Xiang Xue4Ruirun Chen5National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China; Corresponding author.National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China; Corresponding author.To refine the αs phase and form the nano twins, different contents of Zr were added to as-cast Ti–7Mo–4Al–3Nb–2Cr-xZr alloys. Phase and microstructure evolution, mechanical properties and related mechanisms were systematically studied. Results show that as the Zr increases from 0 to 8 wt%, only α and β phases exist and the peak of β (110) shifts from 39.5 to 39.1° by XRD. The volume fraction of the αs phase changes from 75.4 to 73.9%, and its length decreases from 0.62 to 0.22 μm. More dislocations appear in the α/β interface and the growth twin of {10 1¯ 1}α < 11 2¯ 0> type with a width of ∼20 nm forms in α phase as observed by TEM. The refinement of the αs phase is due to the addition of Zr to promote nucleation and inhibit the growth rate. With increasing Zr content from 0 to 8 wt%, the strength increases from 961 to 1303 MPa, while the toughness decreases from 77 to 62 MPa m1/2. The fracture toughness decreases by 19.5%, while the strength increases by 35.6%. The refinement of αs phase, the solubilization of the Zr in the matrix, the increase of dislocation in the α/β interface, and the formation of nano twins are the main reasons for improving the strength and toughness of the studied alloys.http://www.sciencedirect.com/science/article/pii/S2238785422016684Titanium alloyMechanical propertyNano twinsZrMicrostructure evolution |
| spellingShingle | Yili Li Hongze Fang Shichen Sun Xiaofu Zhang Xiang Xue Ruirun Chen Refinement of αs phase and formation of nano-twins of Ti–7Mo–4Al–3Nb–2Cr alloyed by Zr element Journal of Materials Research and Technology Titanium alloy Mechanical property Nano twins Zr Microstructure evolution |
| title | Refinement of αs phase and formation of nano-twins of Ti–7Mo–4Al–3Nb–2Cr alloyed by Zr element |
| title_full | Refinement of αs phase and formation of nano-twins of Ti–7Mo–4Al–3Nb–2Cr alloyed by Zr element |
| title_fullStr | Refinement of αs phase and formation of nano-twins of Ti–7Mo–4Al–3Nb–2Cr alloyed by Zr element |
| title_full_unstemmed | Refinement of αs phase and formation of nano-twins of Ti–7Mo–4Al–3Nb–2Cr alloyed by Zr element |
| title_short | Refinement of αs phase and formation of nano-twins of Ti–7Mo–4Al–3Nb–2Cr alloyed by Zr element |
| title_sort | refinement of αs phase and formation of nano twins of ti 7mo 4al 3nb 2cr alloyed by zr element |
| topic | Titanium alloy Mechanical property Nano twins Zr Microstructure evolution |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422016684 |
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