Microstructures, mechanical properties, and strengthening mechanisms of the (NbMoTa)<sub>100-x</sub> C<sub>x</sub> refractory medium-entropy alloys

doi:10.1016/j.jmst.2024.06.034

IMR OpenIR

	Microstructures, mechanical properties, and strengthening mechanisms of the (NbMoTa)_100-x C_x refractory medium-entropy alloys
	Gou, Xueqian 1,2; Cao, Ruqing 1; Zhou, Weihua 1; Shen, Zheling 1,2; Li, Yi 1
通讯作者	Li, Yi(liyi@imr.ac.cn)
	2025-04-10
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	214 页码:105-119
摘要	Refractory high/medium-entropy alloys (RH/MEAs) are known for their outstanding performance at elevated temperatures; however, they usually exhibit poor room-temperature plasticity, which can be attributed to the non-uniform deformation that occurs at room temperature. Once cracks nucleate, they will rapidly propagate into vertical splitting cracks. Here, we introduce multiple phases including FCC and HCP phases into the NbMoTa RMEA via appropriate addition of carbon. The results show that multiple-phase synergy effectively suppresses non-uniform deformation, thereby delaying the onset of vertical splitting cracks. An optimal combination of compressive strength-plasticity is achieved by the (NbMoTa)(92.5) C-7.5 alloy. The significant improvement in room-temperature mechanical properties can be attributed to its hierarchical microstructure: in the mesoscale, the BCC matrix is divided by eutectic structures; while at the microscale, the BCC matrix is further refined by abundant lath-like FCC precipitates. The FCC precipitates contain high-density stacking faults, acting as a dislocation source under compressive loading. The HCP phase in the eutectic microstructures, in turn, acts as a strong barrier to dislocation movement and simultaneously increases the dislocation storage capacity. These findings open a new route to tailor the microstructure and mechanical properties of RH/MEAs. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Refractory medium-entropy alloys Carbon Microstructures Mechanical properties Strengthening mechanisms
资助者	Na-tional Natural Science Foundation of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China
DOI	10.1016/j.jmst.2024.06.034
收录类别	SCI
语种	英语
资助项目	Na-tional Natural Science Foundation of China[52231006] ; National Key Research and Development Program of China[2017YFB0702003] ; National Natural Science Foundation of China[51871217]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001302495900001
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：3[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/321006/189474
专题	中国科学院金属研究所
通讯作者	Li, Yi
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Gou, Xueqian,Cao, Ruqing,Zhou, Weihua,et al. Microstructures, mechanical properties, and strengthening mechanisms of the (NbMoTa)_100-x C_x refractory medium-entropy alloys[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2025,214:105-119.
APA	Gou, Xueqian,Cao, Ruqing,Zhou, Weihua,Shen, Zheling,&Li, Yi.(2025).Microstructures, mechanical properties, and strengthening mechanisms of the (NbMoTa)_100-x C_x refractory medium-entropy alloys.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,214,105-119.
MLA	Gou, Xueqian,et al."Microstructures, mechanical properties, and strengthening mechanisms of the (NbMoTa)_100-x C_x refractory medium-entropy alloys".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 214(2025):105-119.