Microstructures, mechanical properties, and strengthening mechanisms of the (NbMoTa)100-x Cx refractory medium-entropy alloys
文献类型：期刊论文
| 作者 | Gou, Xueqian1,2; Cao, Ruqing1; Zhou, Weihua1; Shen, Zheling1,2; Li, Yi1 |
| 刊名 | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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| 出版日期 | 2025-04-10 |
| 卷号 | 214页码:105-119 |
| 关键词 | Refractory medium-entropy alloys Carbon Microstructures Mechanical properties Strengthening mechanisms |
| ISSN号 | 1005-0302 |
| DOI | 10.1016/j.jmst.2024.06.034 |
| 通讯作者 | Li, Yi(liyi@imr.ac.cn) |
| 英文摘要 | 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. |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:001302495900001 |
| 出版者 | JOURNAL MATER SCI TECHNOL |
| 资助机构 | Na-tional Natural Science Foundation of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China |
| 源URL |  |
| 专题 | 金属研究所_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 Cx 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 Cx 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 Cx refractory medium-entropy alloys".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 214(2025):105-119. |
入库方式： OAI收割
来源：金属研究所
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