Compositional origin of unusual beta-relaxation properties in La-Ni-Al metallic glasses
文献类型：期刊论文
| 作者 | Zhu, ZG ; Li, YZ ; Wang, Z ; Gao, XQ ; Wen, P ; Bai, HY ; Ngai, KL ; Wang, WH |
| 刊名 | JOURNAL OF CHEMICAL PHYSICS
 |
| 出版日期 | 2014 |
| 卷号 | 141期号:8 |
| ISSN号 | 0021-9606 |
| 通讯作者 | Wang, WH (reprint author), Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China. |
| 中文摘要 | The beta-relaxation of metallic glasses (MGs) bears nontrivial connections to their microscopic and macroscopic properties. In an effort to elucidate the mechanism of the beta-relaxation, we studied by dynamical mechanical measurements the change of its properties on varying the composition of La60Ni15Al25 in various ways. The properties of the beta-relaxation turn out to be very sensitive to the composition. It is found that the isochronal loss peak temperature of beta-relaxation, T-beta ,T-peak, is effectively determined by the total (La + Ni) content. When Cu is added into the alloy to replace either La, Ni, or Al, the T-beta ,T-peak increases with decrease of the (La + Ni) content. The trend is in accordance with data of binary and ternary MGs formed from La, Ni, Al, and Cu. Binary La-Ni MGs have pronounced beta-relaxation loss peaks, well separated from the alpha-relaxation. In contrast, the beta-relaxation is not resolved in La-Al and La-Cu MGs, showing up as an excess wing. For the ternary La-Ni-Al MGs, increase of La or Ni content is crucial to lower the T-beta,T-peak. Keeping the Al content fixed, increase of La content lowers the T-beta ,T-peak further, indicating the more important role La plays in lowering T-beta,T-peak than Ni. The observed effects on changing the composition of La60Ni15Al25 lead to the conclusion that the properties of the beta-relaxation are mainly determined by the interaction between the largest solvent element, La, and the smallest element, Ni. From our data, it is further deduced that La and Ni have high mobility in the MGs, and this explains why the beta-relaxation in this La-based MGs is prominent and well resolved from the alpha-relaxation as opposed to Pd- and Zr-based MGs where the solvent and largest atoms, Pd and Zr, are the least mobile. (C) 2014 AIP Publishing LLC. |
| 资助信息 | NSF of China [51271195, 11274353] |
| 语种 | 英语 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/59176]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Zhu, ZG,Li, YZ,Wang, Z,et al. Compositional origin of unusual beta-relaxation properties in La-Ni-Al metallic glasses[J]. JOURNAL OF CHEMICAL PHYSICS,2014,141(8). |
| APA | Zhu, ZG.,Li, YZ.,Wang, Z.,Gao, XQ.,Wen, P.,...&Wang, WH.(2014).Compositional origin of unusual beta-relaxation properties in La-Ni-Al metallic glasses.JOURNAL OF CHEMICAL PHYSICS,141(8). |
| MLA | Zhu, ZG,et al."Compositional origin of unusual beta-relaxation properties in La-Ni-Al metallic glasses".JOURNAL OF CHEMICAL PHYSICS 141.8(2014). |
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来源：物理研究所
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