A systematic investigation on microstructure evolution, phase transformation and dynamic recrystallization mechanisms of hot isostatic pressed Ti–45Al–2Mn–2Nb–1B alloy during hot deformation
A titanium aluminum alloy (Ti–45Al–2Mn–2Nb–1B, at%) was prepared using hot isostatic pressing (HIP). Thermal simulation compression were carried out at an elevated temperature of 1100–1250 °C, strain rate between 0.001 and 1 s−1, and a reduction in height of 50%. The thermal deformation behaviors, m...
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2025-03-01
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| author | Meiyi Ba Hongkui Tang Lianxi Hu Yu Sun Fei Gao |
| author_facet | Meiyi Ba Hongkui Tang Lianxi Hu Yu Sun Fei Gao |
| author_sort | Meiyi Ba |
| collection | DOAJ |
| description | A titanium aluminum alloy (Ti–45Al–2Mn–2Nb–1B, at%) was prepared using hot isostatic pressing (HIP). Thermal simulation compression were carried out at an elevated temperature of 1100–1250 °C, strain rate between 0.001 and 1 s−1, and a reduction in height of 50%. The thermal deformation behaviors, microstructural evolution, and dynamic recrystallization (DRX) mechanisms were investigated. The results show that stress-induced phase transformation from γ (L10) to α2 (hcp) is facilitated through the successive glide of a/6 [11-2] Shockley partial dislocations across alternating {111} planes of γ phase. The DRX were analyzed using Geometrically necessary dislocations (GND). In the α + γ phase region, the DRX becomes more abundant at an increase in temperature to 1250 °C and a decrease in strain rate to 0.001 s−1. The misorientation analysis showed that continuous dynamic recrystallization (CDRX), which occurs through subgrain rotation and misorientation accumulation, weakens at elevated temperatures and low strain rates. However, discontinuous dynamic recrystallization (DDRX), characterized by the dominance of strain-induced boundary migration mechanism (SIBM) and bulging nucleation, develops more extensively under the same parameters. The microstructure after thermal deformation contains true twins (TT) and pseudo twins (PT) and the DRX grains near twin boundaries (TBs) show a peak misorientation angle of 89 ± 3°, driven by high strain energy at twin intersections. Among the various DRX mechanisms, DDRX emerges as the dominant. This comprehensive analysis offers novel insights into DRX mechanisms, providing valuable guidance for optimizing the hot working process of Ti–45Al–2Mn–2Nb–1B (at%) alloy. |
| format | Article |
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| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-8c2f20bdbda7445ba2d7b8a83e8b58be2025-01-27T04:21:59ZengElsevierJournal of Materials Research and Technology2238-78542025-03-013520232036A systematic investigation on microstructure evolution, phase transformation and dynamic recrystallization mechanisms of hot isostatic pressed Ti–45Al–2Mn–2Nb–1B alloy during hot deformationMeiyi Ba0Hongkui Tang1Lianxi Hu2Yu Sun3Fei Gao4National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; Corresponding author. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China.Sino-Euro Materials Technologies of Xi'an Co., Ltd., Xi'an 710018, ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; Corresponding author. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China.National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; Corresponding author. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China.National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaA titanium aluminum alloy (Ti–45Al–2Mn–2Nb–1B, at%) was prepared using hot isostatic pressing (HIP). Thermal simulation compression were carried out at an elevated temperature of 1100–1250 °C, strain rate between 0.001 and 1 s−1, and a reduction in height of 50%. The thermal deformation behaviors, microstructural evolution, and dynamic recrystallization (DRX) mechanisms were investigated. The results show that stress-induced phase transformation from γ (L10) to α2 (hcp) is facilitated through the successive glide of a/6 [11-2] Shockley partial dislocations across alternating {111} planes of γ phase. The DRX were analyzed using Geometrically necessary dislocations (GND). In the α + γ phase region, the DRX becomes more abundant at an increase in temperature to 1250 °C and a decrease in strain rate to 0.001 s−1. The misorientation analysis showed that continuous dynamic recrystallization (CDRX), which occurs through subgrain rotation and misorientation accumulation, weakens at elevated temperatures and low strain rates. However, discontinuous dynamic recrystallization (DDRX), characterized by the dominance of strain-induced boundary migration mechanism (SIBM) and bulging nucleation, develops more extensively under the same parameters. The microstructure after thermal deformation contains true twins (TT) and pseudo twins (PT) and the DRX grains near twin boundaries (TBs) show a peak misorientation angle of 89 ± 3°, driven by high strain energy at twin intersections. Among the various DRX mechanisms, DDRX emerges as the dominant. This comprehensive analysis offers novel insights into DRX mechanisms, providing valuable guidance for optimizing the hot working process of Ti–45Al–2Mn–2Nb–1B (at%) alloy.http://www.sciencedirect.com/science/article/pii/S2238785425001620Hot isostatic pressingDeformation behaviorDynamic recrystallizationγ → α2 phase transformationTwin and twin intersections |
| spellingShingle | Meiyi Ba Hongkui Tang Lianxi Hu Yu Sun Fei Gao A systematic investigation on microstructure evolution, phase transformation and dynamic recrystallization mechanisms of hot isostatic pressed Ti–45Al–2Mn–2Nb–1B alloy during hot deformation Journal of Materials Research and Technology Hot isostatic pressing Deformation behavior Dynamic recrystallization γ → α2 phase transformation Twin and twin intersections |
| title | A systematic investigation on microstructure evolution, phase transformation and dynamic recrystallization mechanisms of hot isostatic pressed Ti–45Al–2Mn–2Nb–1B alloy during hot deformation |
| title_full | A systematic investigation on microstructure evolution, phase transformation and dynamic recrystallization mechanisms of hot isostatic pressed Ti–45Al–2Mn–2Nb–1B alloy during hot deformation |
| title_fullStr | A systematic investigation on microstructure evolution, phase transformation and dynamic recrystallization mechanisms of hot isostatic pressed Ti–45Al–2Mn–2Nb–1B alloy during hot deformation |
| title_full_unstemmed | A systematic investigation on microstructure evolution, phase transformation and dynamic recrystallization mechanisms of hot isostatic pressed Ti–45Al–2Mn–2Nb–1B alloy during hot deformation |
| title_short | A systematic investigation on microstructure evolution, phase transformation and dynamic recrystallization mechanisms of hot isostatic pressed Ti–45Al–2Mn–2Nb–1B alloy during hot deformation |
| title_sort | systematic investigation on microstructure evolution phase transformation and dynamic recrystallization mechanisms of hot isostatic pressed ti 45al 2mn 2nb 1b alloy during hot deformation |
| topic | Hot isostatic pressing Deformation behavior Dynamic recrystallization γ → α2 phase transformation Twin and twin intersections |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425001620 |
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