Influence of Microstructure and Texture on Tensile Properties of an As-Rolled Ti<sub>2</sub>AlNb-Based Alloy
Ti<sub>2</sub>AlNb-based alloys are widely used in aerospace applications due to their excellent high-temperature mechanical properties. This study aims to investigate the texture, microstructural evolution, and phase transformation behavior of Ti<sub>2</sub>AlNb-based alloy...
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2025-06-01
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| author | Caihong Jing Shoujiang Qu Aihan Feng Hao Wang Daolun Chen |
| author_facet | Caihong Jing Shoujiang Qu Aihan Feng Hao Wang Daolun Chen |
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| description | Ti<sub>2</sub>AlNb-based alloys are widely used in aerospace applications due to their excellent high-temperature mechanical properties. This study aims to investigate the texture, microstructural evolution, and phase transformation behavior of Ti<sub>2</sub>AlNb-based alloy sheets during heat treatment and their effects on tensile properties. During heat treatment, B2 → O phase transformation occurs at 550 °C and 650 °C, while Ostwald ripening takes place at 700 °C and 850 °C. The α<sub>2</sub> phase undergoes spheroidization around 1000 °C due to grain boundary separation and recrystallization. Additionally, the B2, O, and α<sub>2</sub> phases all exhibit strong textures. The B2-phase texture follows a cubic orientation ({100}<001>), rotated ~30° around the normal direction (ND). The O-phase texture consists of a strong {100}<010> rolling texture and a weaker texture component <001>//RD, influenced by the B2-phase texture, rolling deformation, and variant selection during O-phase precipitation. Each B2 grain generates four variants, forming distinct O-phase textures within the same grain. The α<sub>2</sub>-phase texture exhibits typical rolling textures, [0001]//TD, <<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mn>1</mn></mrow><mo>¯</mo></mover></mrow></semantics></math></inline-formula>2<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mn>1</mn></mrow><mo>¯</mo></mover></mrow></semantics></math></inline-formula>0>//ND, and {11<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mn>2</mn></mrow><mo>¯</mo></mover></mrow></semantics></math></inline-formula>0}<01<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mn>1</mn></mrow><mo>¯</mo></mover></mrow></semantics></math></inline-formula>0>, remaining stable after heat treatment. Tensile tests show that the rolled sheet has better ductility along the rolling direction (RD), while the transverse direction (TD) demonstrates higher yield strength (up to 1136 MPa). The anisotropy in tensile properties is mainly attributed to the O-phase texture, with minor contributions from the α<sub>2</sub>-phase and B2-phase textures. These findings provide a theoretical basis for optimizing the mechanical properties of Ti<sub>2</sub>AlNb-based alloys. |
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| spelling | doaj-art-801640decd8248c89a12e08aab5f3aa42025-08-20T03:27:35ZengMDPI AGMetals2075-47012025-06-0115663110.3390/met15060631Influence of Microstructure and Texture on Tensile Properties of an As-Rolled Ti<sub>2</sub>AlNb-Based AlloyCaihong Jing0Shoujiang Qu1Aihan Feng2Hao Wang3Daolun Chen4Shanghai Key Laboratory of D&A for Metal-Functional Materials, School of Materials Science & Engineering, Tongji University, Shanghai 201804, ChinaShanghai Key Laboratory of D&A for Metal-Functional Materials, School of Materials Science & Engineering, Tongji University, Shanghai 201804, ChinaShanghai Key Laboratory of D&A for Metal-Functional Materials, School of Materials Science & Engineering, Tongji University, Shanghai 201804, ChinaInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaDepartment of Mechanical, Industrial and Mechatronics Engineering, Toronto Metropolitan University, Toronto, ON M5B 2K3, CanadaTi<sub>2</sub>AlNb-based alloys are widely used in aerospace applications due to their excellent high-temperature mechanical properties. This study aims to investigate the texture, microstructural evolution, and phase transformation behavior of Ti<sub>2</sub>AlNb-based alloy sheets during heat treatment and their effects on tensile properties. During heat treatment, B2 → O phase transformation occurs at 550 °C and 650 °C, while Ostwald ripening takes place at 700 °C and 850 °C. The α<sub>2</sub> phase undergoes spheroidization around 1000 °C due to grain boundary separation and recrystallization. Additionally, the B2, O, and α<sub>2</sub> phases all exhibit strong textures. The B2-phase texture follows a cubic orientation ({100}<001>), rotated ~30° around the normal direction (ND). The O-phase texture consists of a strong {100}<010> rolling texture and a weaker texture component <001>//RD, influenced by the B2-phase texture, rolling deformation, and variant selection during O-phase precipitation. Each B2 grain generates four variants, forming distinct O-phase textures within the same grain. The α<sub>2</sub>-phase texture exhibits typical rolling textures, [0001]//TD, <<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mn>1</mn></mrow><mo>¯</mo></mover></mrow></semantics></math></inline-formula>2<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mn>1</mn></mrow><mo>¯</mo></mover></mrow></semantics></math></inline-formula>0>//ND, and {11<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mn>2</mn></mrow><mo>¯</mo></mover></mrow></semantics></math></inline-formula>0}<01<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mn>1</mn></mrow><mo>¯</mo></mover></mrow></semantics></math></inline-formula>0>, remaining stable after heat treatment. Tensile tests show that the rolled sheet has better ductility along the rolling direction (RD), while the transverse direction (TD) demonstrates higher yield strength (up to 1136 MPa). The anisotropy in tensile properties is mainly attributed to the O-phase texture, with minor contributions from the α<sub>2</sub>-phase and B2-phase textures. These findings provide a theoretical basis for optimizing the mechanical properties of Ti<sub>2</sub>AlNb-based alloys.https://www.mdpi.com/2075-4701/15/6/631Ti<sub>2</sub>AlNb-based alloysrolling texturespheroidizationvariant selectiontensile properties |
| spellingShingle | Caihong Jing Shoujiang Qu Aihan Feng Hao Wang Daolun Chen Influence of Microstructure and Texture on Tensile Properties of an As-Rolled Ti<sub>2</sub>AlNb-Based Alloy Metals Ti<sub>2</sub>AlNb-based alloys rolling texture spheroidization variant selection tensile properties |
| title | Influence of Microstructure and Texture on Tensile Properties of an As-Rolled Ti<sub>2</sub>AlNb-Based Alloy |
| title_full | Influence of Microstructure and Texture on Tensile Properties of an As-Rolled Ti<sub>2</sub>AlNb-Based Alloy |
| title_fullStr | Influence of Microstructure and Texture on Tensile Properties of an As-Rolled Ti<sub>2</sub>AlNb-Based Alloy |
| title_full_unstemmed | Influence of Microstructure and Texture on Tensile Properties of an As-Rolled Ti<sub>2</sub>AlNb-Based Alloy |
| title_short | Influence of Microstructure and Texture on Tensile Properties of an As-Rolled Ti<sub>2</sub>AlNb-Based Alloy |
| title_sort | influence of microstructure and texture on tensile properties of an as rolled ti sub 2 sub alnb based alloy |
| topic | Ti<sub>2</sub>AlNb-based alloys rolling texture spheroidization variant selection tensile properties |
| url | https://www.mdpi.com/2075-4701/15/6/631 |
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