Additive manufacturing of fine-grain fully lamellar titanium aluminide alloys
Additive manufacturing (AM), or 3D printing, has attracted increased attention in producing metallic parts with complex geometries, but it has proved difficult to prepare equiaxed fine-grain parts because the high thermal gradient in solidification commonly conduces the formation of coarse columnar...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127523004045 |
| _version_ | 1797807243374100480 |
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| author | Yichao Zhu Zefeng Wang Bing Yu Guochao Li Yunfei Xue Yao-Jian Liang |
| author_facet | Yichao Zhu Zefeng Wang Bing Yu Guochao Li Yunfei Xue Yao-Jian Liang |
| author_sort | Yichao Zhu |
| collection | DOAJ |
| description | Additive manufacturing (AM), or 3D printing, has attracted increased attention in producing metallic parts with complex geometries, but it has proved difficult to prepare equiaxed fine-grain parts because the high thermal gradient in solidification commonly conduces the formation of coarse columnar grains. This work shows a solution to fine-grain titanium aluminide (TiAl) alloys by designing a high-frequency thermal cycling to control the solid-state phase transformations in layer-by-layer AM. After solidification, the specially-designed high-frequency thermal cycling can significantly refine the microstructure by repeatedly inducing the nucleation of new grains and suppressing the growth of these newborn fine grains. Therefore, even if solidification leads to coarse columnar grains, equiaxed fine-grain microstructure can still be obtained by solid-state phase transformations. The resulting TiAl alloys have fine heteromorphic grains (∼50 μm) and a fully lamellar microstructure. These fine grains contribute to good strength-ductility balance at room temperature, and their irregular shape and fully lamellar microstructure restrict the flow and distortion of grains at high temperatures, which stands a chance to significantly increase the operating temperature of TiAl parts. |
| first_indexed | 2024-03-13T06:19:38Z |
| format | Article |
| id | doaj.art-5c78733b50bc460986fe974d4c7b615b |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-03-13T06:19:38Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-5c78733b50bc460986fe974d4c7b615b2023-06-10T04:27:04ZengElsevierMaterials & Design0264-12752023-06-01230111989Additive manufacturing of fine-grain fully lamellar titanium aluminide alloysYichao Zhu0Zefeng Wang1Bing Yu2Guochao Li3Yunfei Xue4Yao-Jian Liang5School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR ChinaSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR ChinaSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR ChinaBeijing Beiye Functional Materials Corporation, 1 Xiaoying East Road, Beijing 100192, PR ChinaSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR ChinaSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China; Corresponding author.Additive manufacturing (AM), or 3D printing, has attracted increased attention in producing metallic parts with complex geometries, but it has proved difficult to prepare equiaxed fine-grain parts because the high thermal gradient in solidification commonly conduces the formation of coarse columnar grains. This work shows a solution to fine-grain titanium aluminide (TiAl) alloys by designing a high-frequency thermal cycling to control the solid-state phase transformations in layer-by-layer AM. After solidification, the specially-designed high-frequency thermal cycling can significantly refine the microstructure by repeatedly inducing the nucleation of new grains and suppressing the growth of these newborn fine grains. Therefore, even if solidification leads to coarse columnar grains, equiaxed fine-grain microstructure can still be obtained by solid-state phase transformations. The resulting TiAl alloys have fine heteromorphic grains (∼50 μm) and a fully lamellar microstructure. These fine grains contribute to good strength-ductility balance at room temperature, and their irregular shape and fully lamellar microstructure restrict the flow and distortion of grains at high temperatures, which stands a chance to significantly increase the operating temperature of TiAl parts.http://www.sciencedirect.com/science/article/pii/S0264127523004045Additive manufacturingTitanium aluminidesGrain refinementSolid state phase transformationMechanical properties |
| spellingShingle | Yichao Zhu Zefeng Wang Bing Yu Guochao Li Yunfei Xue Yao-Jian Liang Additive manufacturing of fine-grain fully lamellar titanium aluminide alloys Materials & Design Additive manufacturing Titanium aluminides Grain refinement Solid state phase transformation Mechanical properties |
| title | Additive manufacturing of fine-grain fully lamellar titanium aluminide alloys |
| title_full | Additive manufacturing of fine-grain fully lamellar titanium aluminide alloys |
| title_fullStr | Additive manufacturing of fine-grain fully lamellar titanium aluminide alloys |
| title_full_unstemmed | Additive manufacturing of fine-grain fully lamellar titanium aluminide alloys |
| title_short | Additive manufacturing of fine-grain fully lamellar titanium aluminide alloys |
| title_sort | additive manufacturing of fine grain fully lamellar titanium aluminide alloys |
| topic | Additive manufacturing Titanium aluminides Grain refinement Solid state phase transformation Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S0264127523004045 |
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