Breaking the high-temperature strength-ductility trade-off in TiAl alloys through microstructural optimization

doi:10.1016/j.ijplas.2023.103756

IMR OpenIR

	Breaking the high-temperature strength-ductility trade-off in TiAl alloys through microstructural optimization
	Zheng, Guoming 1; Tang, Bin 1,2; Zhao, Songkuan 1; Wang, Jun 3; Xie, Yizhen 1; Chen, Xiaofei 1; Wang, William Yi 1,2; Liu, Dong 4; Yang, Rui 4; Li, Jinshan 1,2
通讯作者	Tang, Bin(toby@nwpu.edu.cn) ; Li, Jinshan(ljsh@nwpu.edu.cn)
	2023-11-01
发表期刊	INTERNATIONAL JOURNAL OF PLASTICITY
ISSN	0749-6419
卷号	170 页码:20
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.
关键词	TiAl alloys Pearlitic-like microstructure Microstructure design High-temperature mechanical properties
资助者	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
DOI	10.1016/j.ijplas.2023.103756
收录类别	SCI
语种	英语
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
WOS类目	Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
WOS记录号	WOS:001082463400001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：33[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/179504
专题	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, State Key Lab Solidificat Proc, Xian 710072, Peoples R China 2.Northwestern Polytech Univ, Chongqing Innovat Ctr, Chongqing 401135, Peoples R China 3.Deakin Univ, Inst Frontier Mat, Geelong, Vic 3216, Australia 4.Chinese Acad Sci, Inst Met Res, Shenyang 110016, 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.