Breakdown of the Hall-Petch relationship in extremely fine nanograined body-centered cubic Mo alloys
文献类型：期刊论文
| 作者 | Duan, F. H.1; Naunheim, Y.2; Schuh, C. A.2; Li, Y.1 |
| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2021-07-01 |
| 卷号 | 213页码:9 |
| ISSN号 | 1359-6454 |
| 关键词 | Nanocrystalline materials Hall-Petch breakdown Refractory bcc alloys Grain boundary Deformation behavior |
| DOI | 10.1016/j.actamat.2021.116950 |
| 通讯作者 | Schuh, C. A.(schuh@mit.edu) ; Li, Y.(liyi@imr.ac.cn) |
| 英文摘要 | Mechanical properties and deformation behavior have been studied in face-centered cubic (fcc) metals with extremely fine grain sizes, even below about 20 nm, but this range is rarely studied in the body centered cubic (bcc) metals. Here, we study the hardness and deformation behavior of bcc Mo(O) alloys with grain sizes from 120 to 4 nm, covering the range of classical Hall-Petch behavior as well as the regime where that scaling law breaks down, between about 11 and 4 nm. A hardness as high as 17.3 GPa was achieved at the strongest grain size of 11 nm, and the breakdown at smaller grain sizes is associated with a number of changes in behavior: an inflection in activation volume (associated with a change in rate dependence of deformation) and increasing shear localization. At coarser grain sizes this is associated with shear offsets at grain boundaries, pointing to an increasing prevalence of intergranular deformation (by sliding or grain rotation). At finer grain sizes localization is associated with the formation of large shear bands at scales far greater than the grain size. These behaviors are suggestive of a crossover from crystal-like to glass-like deformation behaviors at the finest grain sizes, consistent with the increasing fraction of disordered regions in the structure. (c) 2021 Published by Elsevier Ltd on behalf of Acta Materialia Inc. |
| 资助项目 | Shenyang National Laboratory for Materials Science[E01SL102] ; US National Science Foundation[DMR-2002860] ; NASA[80MSFC19C0050] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| WOS记录号 | WOS:000670106400003 |
| 资助机构 | Shenyang National Laboratory for Materials Science ; US National Science Foundation ; NASA |
| 源URL | [http://ir.imr.ac.cn/handle/321006/159922]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Schuh, C. A.; Li, Y. |
| 作者单位 | 1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang, Peoples R China 2.MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA |
| 推荐引用方式 GB/T 7714 | Duan, F. H.,Naunheim, Y.,Schuh, C. A.,et al. Breakdown of the Hall-Petch relationship in extremely fine nanograined body-centered cubic Mo alloys[J]. ACTA MATERIALIA,2021,213:9. |
| APA | Duan, F. H.,Naunheim, Y.,Schuh, C. A.,&Li, Y..(2021).Breakdown of the Hall-Petch relationship in extremely fine nanograined body-centered cubic Mo alloys.ACTA MATERIALIA,213,9. |
| MLA | Duan, F. H.,et al."Breakdown of the Hall-Petch relationship in extremely fine nanograined body-centered cubic Mo alloys".ACTA MATERIALIA 213(2021):9. |
入库方式： OAI收割
来源：金属研究所
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