Breaking the high-temperature strength-ductility trade-off in TiAl alloys through microstructural optimization
文献类型：期刊论文
| 作者 | Zheng, Guoming4; Tang, Bin1,4; Zhao, Songkuan4; Wang, Jun2; Xie, Yizhen4; Chen, Xiaofei4; Wang, William Yi1,4; Liu, Dong3; Yang, Rui3; Li, Jinshan1,4 |
| 刊名 | INTERNATIONAL JOURNAL OF PLASTICITY
 |
| 出版日期 | 2023-11-01 |
| 卷号 | 170页码:20 |
| 关键词 | TiAl alloys Pearlitic-like microstructure Microstructure design High-temperature mechanical properties |
| ISSN号 | 0749-6419 |
| DOI | 10.1016/j.ijplas.2023.103756 |
| 通讯作者 | Tang, Bin(toby@nwpu.edu.cn) ; Li, Jinshan(ljsh@nwpu.edu.cn) |
| 英文摘要 | Designing a novel microstructure with higher strength-ductility than lamellar microstructure (LM), which has been considered the most valuable engineering application in the service temperature range, is desired for lightweight TiAl alloys. Our prior publication reported a three-phase tri-modal (T-T) structure for Ti-43.5Al-4Nb-1Mo-0.1B(.at%) with superior mechanical properties than LM at room temperature (Ref: Acta Mater. 225 (2022) 117,585). However, its strength-ductility at working temperature has yet to be fully exploited. This work fills the much-needed gap. The qualitative and quantitative optimizations indicate that the T-T structure's yield strength increases first and then decreases with increasing pearlitic-like microstructure (PM, which consist of three-phase (alpha(2), gamma and beta(o) phase) with clear orientation relationships that form in a lamellar/cellular manner) content while the ductility keeps rising. When the T-T structure contains similar to 20 % PMs, it exhibits a yield strength about 130MPa higher than LM coupling with doubled ductility at 750 degrees C. PMs can induce a prominent twinning induced plasticity and dislocation jog dragging (TWIP&DJD) effect, resulting in better strength-ductility below 700 degrees C; above this temperature, the TWIP&DJD effect significantly plasticizes the alloys. The higher strength of the T-T structure at 750 degrees C is caused by hetero-deformation-induced strengthening between LMs and PMs, which cannot be offset by the plasticizing caused by PM when the volume fraction of PMs is less than 50 %. This study demonstrates that introducing an appropriate amount of plasticizing structures (similar to PM) with excellent work hardening capacity is a promising strategy for enhancing the strength-ductility synergy of TiAl and possibly other brittle materials. |
| 资助项目 | National Key Research and Development Program of China[2021YFB3702603] ; National Natural Science Foundation of China[52174377] ; Research Fund of the State Key Laboratory of Solidification Processing (NPU) , China[2022-TS-06] |
| WOS研究方向 | Engineering ; Materials Science ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:001082463400001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Key Research and Development Program of China ; National Natural Science Foundation of China ; Research Fund of the State Key Laboratory of Solidification Processing (NPU) , China |
| 源URL | [http://ir.imr.ac.cn/handle/321006/179503]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Tang, Bin; Li, Jinshan |
| 作者单位 | 1.Northwestern Polytech Univ, Chongqing Innovat Ctr, Chongqing 401135, Peoples R China 2.Deakin Univ, Inst Frontier Mat, Geelong, Vic 3216, Australia 3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 4.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zheng, Guoming,Tang, Bin,Zhao, Songkuan,et al. Breaking the high-temperature strength-ductility trade-off in TiAl alloys through microstructural optimization[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2023,170:20. |
| APA | Zheng, Guoming.,Tang, Bin.,Zhao, Songkuan.,Wang, Jun.,Xie, Yizhen.,...&Li, Jinshan.(2023).Breaking the high-temperature strength-ductility trade-off in TiAl alloys through microstructural optimization.INTERNATIONAL JOURNAL OF PLASTICITY,170,20. |
| MLA | Zheng, Guoming,et al."Breaking the high-temperature strength-ductility trade-off in TiAl alloys through microstructural optimization".INTERNATIONAL JOURNAL OF PLASTICITY 170(2023):20. |
入库方式： OAI收割
来源：金属研究所
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