Extreme rejuvenation and softening in a bulk metallic glass
文献类型：期刊论文
| 作者 | Pan, J; Wang, YX; Guo, Q; Zhang, D; Greer, AL; Li, Y; Li, Y (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.; Greer, AL (reprint author), Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England. |
| 刊名 | NATURE COMMUNICATIONS
 |
| 出版日期 | 2018-02-08 |
| 卷号 | 9页码:- |
| 关键词 | Structural Relaxation Plastic-deformation Amorphous-alloys Stored Energy Shear Bands Free-volume Hardness Diffusion Stress State |
| ISSN号 | 2041-1723 |
| 英文摘要 | Rejuvenation of metallic glasses, bringing them to higher-energy states, is of interest in improving their plasticity. The mechanisms of rejuvenation are poorly understood, and its limits remain unexplored. We use constrained loading in compression to impose substantial plastic flow on a zirconium-based bulk metallic glass. The maximum measured effects are that the hardness of the glass decreases by 36%, and its excess enthalpy (above the relaxed state) increases to 41% of the enthalpy of melting. Comparably high degrees of rejuvenation have been reported only on microscopic scales at the centre of shear bands confined to low volume fractions. This extreme rejuvenation of a bulk glass gives a state equivalent to that obtainable by quenching the liquid at similar to 10(10) K s(-1), many orders of magnitude faster than is possible for bulk specimens. The contrast with earlier results showing relaxation in similar tests under tension emphasizes the importance of hydrostatic stress.; Rejuvenation of metallic glasses, bringing them to higher-energy states, is of interest in improving their plasticity. The mechanisms of rejuvenation are poorly understood, and its limits remain unexplored. We use constrained loading in compression to impose substantial plastic flow on a zirconium-based bulk metallic glass. The maximum measured effects are that the hardness of the glass decreases by 36%, and its excess enthalpy (above the relaxed state) increases to 41% of the enthalpy of melting. Comparably high degrees of rejuvenation have been reported only on microscopic scales at the centre of shear bands confined to low volume fractions. This extreme rejuvenation of a bulk glass gives a state equivalent to that obtainable by quenching the liquid at similar to 10(10) K s(-1), many orders of magnitude faster than is possible for bulk specimens. The contrast with earlier results showing relaxation in similar tests under tension emphasizes the importance of hydrostatic stress. |
| 学科主题 | Multidisciplinary Sciences |
| 语种 | 英语 |
| 资助机构 | National Natural Science Foundation of China [51401220, 51471165]; European Research Council under the European Union's Horizon research and innovation programme [ERC-2015-AdG-695487: ExtendGlass] |
| 公开日期 | 2018-06-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/79513]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Li, Y (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.; Greer, AL (reprint author), Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England. |
| 推荐引用方式 GB/T 7714 | Pan, J,Wang, YX,Guo, Q,et al. Extreme rejuvenation and softening in a bulk metallic glass[J]. NATURE COMMUNICATIONS,2018,9:-. |
| APA | Pan, J.,Wang, YX.,Guo, Q.,Zhang, D.,Greer, AL.,...&Greer, AL .(2018).Extreme rejuvenation and softening in a bulk metallic glass.NATURE COMMUNICATIONS,9,-. |
| MLA | Pan, J,et al."Extreme rejuvenation and softening in a bulk metallic glass".NATURE COMMUNICATIONS 9(2018):-. |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。