Formation and growth mechanism of the α2 lath within the γ phase in high Nb containing TiAl alloy
A high Nb containing TiAl alloy exhibiting near fully lamellar microstructure with nano-lamellar spacing was obtained via heat treatment. The lamellar structure exhibits an average spacing of approximately 75 nm and comprises both γ/α₂ and γ/γ interfaces. Subsequent multiaxial compression led to the...
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| 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/S2238785425001310 |
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| author | Gengwu Ge Gang Yang Yingchao Guo Yongfeng Liang Junpin Lin |
| author_facet | Gengwu Ge Gang Yang Yingchao Guo Yongfeng Liang Junpin Lin |
| author_sort | Gengwu Ge |
| collection | DOAJ |
| description | A high Nb containing TiAl alloy exhibiting near fully lamellar microstructure with nano-lamellar spacing was obtained via heat treatment. The lamellar structure exhibits an average spacing of approximately 75 nm and comprises both γ/α₂ and γ/γ interfaces. Subsequent multiaxial compression led to the development of a basketweave microstructure composed of crisscross α₂ laths within γ grains. The α2 phase exhibit different orientations, resulting from the precipitation along the equivalent planes {111}γ within the equiaxed γ grains. The growth of the α2 phase proceeds through the “terrace-ledge-kinking” mechanism. The long periodic stacking ordered structure, 6H, is an intermediate structure during the γ→α phase transformation. The γ phase, α2 phase and 6H satisfy the orientation relationship: (111)γ//(0001)α2//(0006)6H, [1‾ 10]γ//[11 2‾ 0]α2//[01 1‾ 0]6H. The microhardness of the alloy with basketweave microstructure is higher than the as-cast alloy. |
| format | Article |
| id | doaj-art-728da5972b4e4fbb8bbc21a6fac60511 |
| 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-728da5972b4e4fbb8bbc21a6fac605112025-01-30T05:14:20ZengElsevierJournal of Materials Research and Technology2238-78542025-03-013522982303Formation and growth mechanism of the α2 lath within the γ phase in high Nb containing TiAl alloyGengwu Ge0Gang Yang1Yingchao Guo2Yongfeng Liang3Junpin Lin4State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China; China Academy of Machinery Beijing Research Institute of Mechanical & Electrical Technology Co., Ltd., Beijing, 100083, ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China; China Nonferrous Metals Innovation Institute (Tianjin) Co., Ltd., Tianjin, 300393, ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China; Corresponding author.State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China; Corresponding author.A high Nb containing TiAl alloy exhibiting near fully lamellar microstructure with nano-lamellar spacing was obtained via heat treatment. The lamellar structure exhibits an average spacing of approximately 75 nm and comprises both γ/α₂ and γ/γ interfaces. Subsequent multiaxial compression led to the development of a basketweave microstructure composed of crisscross α₂ laths within γ grains. The α2 phase exhibit different orientations, resulting from the precipitation along the equivalent planes {111}γ within the equiaxed γ grains. The growth of the α2 phase proceeds through the “terrace-ledge-kinking” mechanism. The long periodic stacking ordered structure, 6H, is an intermediate structure during the γ→α phase transformation. The γ phase, α2 phase and 6H satisfy the orientation relationship: (111)γ//(0001)α2//(0006)6H, [1‾ 10]γ//[11 2‾ 0]α2//[01 1‾ 0]6H. The microhardness of the alloy with basketweave microstructure is higher than the as-cast alloy.http://www.sciencedirect.com/science/article/pii/S2238785425001310TiAl alloyα2 lathPhase transformationLong periodic stacking ordered structure |
| spellingShingle | Gengwu Ge Gang Yang Yingchao Guo Yongfeng Liang Junpin Lin Formation and growth mechanism of the α2 lath within the γ phase in high Nb containing TiAl alloy Journal of Materials Research and Technology TiAl alloy α2 lath Phase transformation Long periodic stacking ordered structure |
| title | Formation and growth mechanism of the α2 lath within the γ phase in high Nb containing TiAl alloy |
| title_full | Formation and growth mechanism of the α2 lath within the γ phase in high Nb containing TiAl alloy |
| title_fullStr | Formation and growth mechanism of the α2 lath within the γ phase in high Nb containing TiAl alloy |
| title_full_unstemmed | Formation and growth mechanism of the α2 lath within the γ phase in high Nb containing TiAl alloy |
| title_short | Formation and growth mechanism of the α2 lath within the γ phase in high Nb containing TiAl alloy |
| title_sort | formation and growth mechanism of the α2 lath within the γ phase in high nb containing tial alloy |
| topic | TiAl alloy α2 lath Phase transformation Long periodic stacking ordered structure |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425001310 |
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