High-performing TiAl alloy with lamellar-network two-scale structure via semi-solid forging and its non-equilibrium solidification mechanism
TiAl alloys are lightweight, high-strength, and have good mechanical properties at elevated temperatures, rendering them appealing for high-temperature applications. However, their difficult processing, and limited ductility at ambient temperatures have hindered their widespread application. Here, w...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
|
| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525002485 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849688173837287424 |
|---|---|
| author | Yuan Ye Yuyong Chen Yu Zhang Shuzhi Zhang Jianfei Sun |
| author_facet | Yuan Ye Yuyong Chen Yu Zhang Shuzhi Zhang Jianfei Sun |
| author_sort | Yuan Ye |
| collection | DOAJ |
| description | TiAl alloys are lightweight, high-strength, and have good mechanical properties at elevated temperatures, rendering them appealing for high-temperature applications. However, their difficult processing, and limited ductility at ambient temperatures have hindered their widespread application. Here, we report fabrication of a Ti-43Al-9 V-0.3Y alloy with a novel lamellar-network two-scale structure comprising an inner α2/γ lamellar colony + outer β0/γ phases via semi-solid forging process. The formation of this lamellar-network two-scale structure is elucidated from the perspective of the solute diffusion and redistribution occurring, and occurs due to liquid segregation and a non-equilibrium transition of L → β(β0) + α at late solidification. Compared to the as-cast alloy, the semi-solid forged alloy exhibits significant increases in elongation and tensile strength at room temperature and 800°C. The high density of dislocations and mechanical twins in the β0/γ phases and special α2/γ lamellae during tensile deformation effectively release the plastic deformation potential of the TiAl alloy at room temperature. Moreover, the abundant nano-twins in the β0/γ phase and γ dynamic recrystallization behavior at 800 ℃ significantly enhance the high-temperature plasticity. This approach and microstructure offer a promising solution to the engineering challenges posed by the low room-temperature ductility and limited hot-working ability of TiAl alloys. |
| format | Article |
| id | doaj-art-ba10562c19de4a83adc1aa9ddf88488c |
| institution | DOAJ |
| issn | 0264-1275 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj-art-ba10562c19de4a83adc1aa9ddf88488c2025-08-20T03:22:04ZengElsevierMaterials & Design0264-12752025-05-0125311382810.1016/j.matdes.2025.113828High-performing TiAl alloy with lamellar-network two-scale structure via semi-solid forging and its non-equilibrium solidification mechanismYuan Ye0Yuyong Chen1Yu Zhang2Shuzhi Zhang3Jianfei Sun4School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; The National Key Laboratory for Precision Hot Forming of Metals, Harbin 150001, China; Corresponding authors.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; Corresponding authors.State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China; Corresponding authors.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaTiAl alloys are lightweight, high-strength, and have good mechanical properties at elevated temperatures, rendering them appealing for high-temperature applications. However, their difficult processing, and limited ductility at ambient temperatures have hindered their widespread application. Here, we report fabrication of a Ti-43Al-9 V-0.3Y alloy with a novel lamellar-network two-scale structure comprising an inner α2/γ lamellar colony + outer β0/γ phases via semi-solid forging process. The formation of this lamellar-network two-scale structure is elucidated from the perspective of the solute diffusion and redistribution occurring, and occurs due to liquid segregation and a non-equilibrium transition of L → β(β0) + α at late solidification. Compared to the as-cast alloy, the semi-solid forged alloy exhibits significant increases in elongation and tensile strength at room temperature and 800°C. The high density of dislocations and mechanical twins in the β0/γ phases and special α2/γ lamellae during tensile deformation effectively release the plastic deformation potential of the TiAl alloy at room temperature. Moreover, the abundant nano-twins in the β0/γ phase and γ dynamic recrystallization behavior at 800 ℃ significantly enhance the high-temperature plasticity. This approach and microstructure offer a promising solution to the engineering challenges posed by the low room-temperature ductility and limited hot-working ability of TiAl alloys.http://www.sciencedirect.com/science/article/pii/S0264127525002485TiAl alloySemi-solid forgingMechanical propertiesNon-equilibrium solidification |
| spellingShingle | Yuan Ye Yuyong Chen Yu Zhang Shuzhi Zhang Jianfei Sun High-performing TiAl alloy with lamellar-network two-scale structure via semi-solid forging and its non-equilibrium solidification mechanism Materials & Design TiAl alloy Semi-solid forging Mechanical properties Non-equilibrium solidification |
| title | High-performing TiAl alloy with lamellar-network two-scale structure via semi-solid forging and its non-equilibrium solidification mechanism |
| title_full | High-performing TiAl alloy with lamellar-network two-scale structure via semi-solid forging and its non-equilibrium solidification mechanism |
| title_fullStr | High-performing TiAl alloy with lamellar-network two-scale structure via semi-solid forging and its non-equilibrium solidification mechanism |
| title_full_unstemmed | High-performing TiAl alloy with lamellar-network two-scale structure via semi-solid forging and its non-equilibrium solidification mechanism |
| title_short | High-performing TiAl alloy with lamellar-network two-scale structure via semi-solid forging and its non-equilibrium solidification mechanism |
| title_sort | high performing tial alloy with lamellar network two scale structure via semi solid forging and its non equilibrium solidification mechanism |
| topic | TiAl alloy Semi-solid forging Mechanical properties Non-equilibrium solidification |
| url | http://www.sciencedirect.com/science/article/pii/S0264127525002485 |
| work_keys_str_mv | AT yuanye highperformingtialalloywithlamellarnetworktwoscalestructureviasemisolidforginganditsnonequilibriumsolidificationmechanism AT yuyongchen highperformingtialalloywithlamellarnetworktwoscalestructureviasemisolidforginganditsnonequilibriumsolidificationmechanism AT yuzhang highperformingtialalloywithlamellarnetworktwoscalestructureviasemisolidforginganditsnonequilibriumsolidificationmechanism AT shuzhizhang highperformingtialalloywithlamellarnetworktwoscalestructureviasemisolidforginganditsnonequilibriumsolidificationmechanism AT jianfeisun highperformingtialalloywithlamellarnetworktwoscalestructureviasemisolidforginganditsnonequilibriumsolidificationmechanism |