Degradation of the mechanical properties of NbMoTaW refractory high-entropy alloy in tension
文献类型：期刊论文
| 作者 | Kumar, Punit1,2; Gou, Xueqian3,4; Cook, David H.1,2; Payne, Madelyn I.1,2; Morrison, Nathaniel J.1; Wang, Wenqing1,2; Zhang, Mingwei5; Asta, Mark1,2; Minor, Andrew M.1,2,6; Cao, Ruqing4 |
| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2024-10-15 |
| 卷号 | 279页码:11 |
| 关键词 | Multiple principal element alloys Refractory alloys High-temperature deformation Tensile behavior Intergranular fracture |
| ISSN号 | 1359-6454 |
| DOI | 10.1016/j.actamat.2024.120297 |
| 通讯作者 | Ritchie, Robert O.(roritchie@lbl.gov) |
| 英文摘要 | The mechanical properties of the bcc refractory high-entropy alloy (RHEA) NbMoTaW with columnar and equiaxed microstructures and a nanoscale metal oxide layer on the grain boundaries are investigated at ambient temperatures (RT) to 1200 degrees C. Under compression, the alloy shows a yield strength, sigma(y), of similar to 1390 +/- 20 MPa at RT and retains a high yield strength, sigma(y), of similar to 301.5 MPa at 1200 degrees C. However, in tension, the fracture strengths, sigma(f), of both columnar and equiaxed microstructures are far lower - below 70 MPa - and the material fails in the elastic regime without showing any measurable ductility at all temperatures. The fracture mechanisms in tension transition from transgranular cleavage at RT to a mixture of transgranular and intergranular fracture at 800 degrees C to a complete intergranular fracture at 1200 degrees C due to selective weakening of the metal oxide layer on the grain boundaries driven by a structural change. The transition in the fracture mechanism in the equiaxed microstructure promotes extrinsic toughening at higher temperatures, resulting in a similar to 6.4 times higher fracture toughness (K-Ic similar to 10.3 MPa root m) at 1200 degrees C compared to that at RT. NbMoTaW is a well-known RHEA, but the poor tensile strength and fracture toughness measured in this study highlight the critical importance of investigating the mechanical properties of these high-temperature RHEAs in tension. |
| 资助项目 | U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division[DE-AC02-05-CH11231] ; Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy ; NSF Graduate Fellowship from the National Science Foundation[DGE 2146752] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001301615400001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division ; Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy ; NSF Graduate Fellowship from the National Science Foundation |
| 源URL |  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Ritchie, Robert O. |
| 作者单位 | 1.Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA 2.Mat Sci Div, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang, Peoples R China 4.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang, Peoples R China 5.Univ Calif Davis, Dept Mat Sci & Engn, Davis, CA USA 6.Natl Ctr Electron Microscopy, Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA USA |
| 推荐引用方式 GB/T 7714 | Kumar, Punit,Gou, Xueqian,Cook, David H.,et al. Degradation of the mechanical properties of NbMoTaW refractory high-entropy alloy in tension[J]. ACTA MATERIALIA,2024,279:11. |
| APA | Kumar, Punit.,Gou, Xueqian.,Cook, David H..,Payne, Madelyn I..,Morrison, Nathaniel J..,...&Ritchie, Robert O..(2024).Degradation of the mechanical properties of NbMoTaW refractory high-entropy alloy in tension.ACTA MATERIALIA,279,11. |
| MLA | Kumar, Punit,et al."Degradation of the mechanical properties of NbMoTaW refractory high-entropy alloy in tension".ACTA MATERIALIA 279(2024):11. |
入库方式： OAI收割
来源：金属研究所
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