The Morphology and Solute Segregation of Dendrite Growth in Ti-4.5% Al Alloy: A Phase-Field Study
Ti-Al alloys have excellent high-temperature performance and are often used in the manufacture of high-pressure compressors and low-pressure turbine blades for military aircraft engines. However, solute segregation is easy to occur in the solidification process of Ti-Al alloys, which will affect the...
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MDPI AG
2021-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/23/7257 |
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| author | Yongmei Zhang Xiaona Wang Shuai Yang Weipeng Chen Hua Hou |
| author_facet | Yongmei Zhang Xiaona Wang Shuai Yang Weipeng Chen Hua Hou |
| author_sort | Yongmei Zhang |
| collection | DOAJ |
| description | Ti-Al alloys have excellent high-temperature performance and are often used in the manufacture of high-pressure compressors and low-pressure turbine blades for military aircraft engines. However, solute segregation is easy to occur in the solidification process of Ti-Al alloys, which will affect their properties. In this study, we used the quantitative phase-field model developed by Karma to study the equiaxed dendrite growth of Ti-4.5% Al alloy. The effects of supersaturation, undercooling and thermal disturbance on the dendrite morphology and solute segregation were studied. The results showed that the increase of supersaturation and undercooling will promote the growth of secondary dendrite arms and aggravate the solute segregation. When the undercooling is large, the solute in the root of the primary dendrite arms is seriously enriched, and when the supersaturation is large, the time for the dendrite tips to reach a steady-state will be shortened. The thermal disturbance mainly affects the morphology and distribution of the secondary dendrite arms but has almost no effect on the steady-state of the primary dendrite tips. This is helpful to understand the cause of solute segregation in Ti-Al alloy theoretically. |
| first_indexed | 2024-03-10T04:49:41Z |
| format | Article |
| id | doaj.art-c056bc2613964906a43b61eda88950a5 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T04:49:41Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-c056bc2613964906a43b61eda88950a52023-11-23T02:40:41ZengMDPI AGMaterials1996-19442021-11-011423725710.3390/ma14237257The Morphology and Solute Segregation of Dendrite Growth in Ti-4.5% Al Alloy: A Phase-Field StudyYongmei Zhang0Xiaona Wang1Shuai Yang2Weipeng Chen3Hua Hou4School of Science, North University of China, Taiyuan 030051, ChinaSchool of Science, North University of China, Taiyuan 030051, ChinaSchool of Materials Science and Engineering, North University of China, Taiyuan 030051, ChinaSchool of Materials Science and Engineering, North University of China, Taiyuan 030051, ChinaSchool of Materials Science and Engineering, North University of China, Taiyuan 030051, ChinaTi-Al alloys have excellent high-temperature performance and are often used in the manufacture of high-pressure compressors and low-pressure turbine blades for military aircraft engines. However, solute segregation is easy to occur in the solidification process of Ti-Al alloys, which will affect their properties. In this study, we used the quantitative phase-field model developed by Karma to study the equiaxed dendrite growth of Ti-4.5% Al alloy. The effects of supersaturation, undercooling and thermal disturbance on the dendrite morphology and solute segregation were studied. The results showed that the increase of supersaturation and undercooling will promote the growth of secondary dendrite arms and aggravate the solute segregation. When the undercooling is large, the solute in the root of the primary dendrite arms is seriously enriched, and when the supersaturation is large, the time for the dendrite tips to reach a steady-state will be shortened. The thermal disturbance mainly affects the morphology and distribution of the secondary dendrite arms but has almost no effect on the steady-state of the primary dendrite tips. This is helpful to understand the cause of solute segregation in Ti-Al alloy theoretically.https://www.mdpi.com/1996-1944/14/23/7257Ti-4.5% Al alloyphase-field methoddendritesolute segregation |
| spellingShingle | Yongmei Zhang Xiaona Wang Shuai Yang Weipeng Chen Hua Hou The Morphology and Solute Segregation of Dendrite Growth in Ti-4.5% Al Alloy: A Phase-Field Study Materials Ti-4.5% Al alloy phase-field method dendrite solute segregation |
| title | The Morphology and Solute Segregation of Dendrite Growth in Ti-4.5% Al Alloy: A Phase-Field Study |
| title_full | The Morphology and Solute Segregation of Dendrite Growth in Ti-4.5% Al Alloy: A Phase-Field Study |
| title_fullStr | The Morphology and Solute Segregation of Dendrite Growth in Ti-4.5% Al Alloy: A Phase-Field Study |
| title_full_unstemmed | The Morphology and Solute Segregation of Dendrite Growth in Ti-4.5% Al Alloy: A Phase-Field Study |
| title_short | The Morphology and Solute Segregation of Dendrite Growth in Ti-4.5% Al Alloy: A Phase-Field Study |
| title_sort | morphology and solute segregation of dendrite growth in ti 4 5 al alloy a phase field study |
| topic | Ti-4.5% Al alloy phase-field method dendrite solute segregation |
| url | https://www.mdpi.com/1996-1944/14/23/7257 |
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