Al-Cu approximants and associated B2 chemical-twinning modes
文献类型：期刊论文
| 作者 | C. Dong ; Q. H. Zhang ; D. H. Wang ; Y. M. Wang |
| 刊名 | Micron
 |
| 出版日期 | 2000 |
| 卷号 | 31期号:5页码:507-514 |
| 关键词 | Al-Cu system quasicrystals approximants chemical twinning electron microscopy quasi-crystals system |
| ISSN号 | 0968-4328 |
| 中文摘要 | The Al3Cu4 alloy, with an ela ratio of 1.86 being close to ternary AI-Cu-TM (transition metal) quasicrystals, has been chosen for the search of AI-Cu approximants. Phase structures and compositions were studied using TEM, X-ray diffraction and EPMA techniques. Two new phases were found: face-centered orthorhombic oF-Al43.2Cu56.8 (a = 0.816(6), b = 1.414(9), c = 0.999(5) nm) and body-centered orthorhombic oI-Al41.3Cu58.7 (oI, a = 0.408(3), b = 0.707(4), c = 0.9995 nm). Their ela ratios are the same as that of the Al-Cu-Fe icosahedral quasicrystal. Both are B2 superstructures and their unit cell components can be expressed approximately as oF-Al(36)Cu(48)n square(12) and oI-Al(8)Cu(12)square(4) (square: vacancies). They both exist in twinning variants of the types 120 degrees/[001] and 180 degrees/[310]. Such twinning modes indicate that these orthorhombic phases are the decomposition products of a high-temperature parent phase epsilon 2-Al2Cu3, the atomic structure of which shows pentagonal atomic arrangements. Further analysis on the twinning modes of of and oI leads to the recognition of the chemical-twinning mode of the basic B2 structure as 180 degrees/[111](B2) This kind of chemical twinning mode is responsible for the pentagonal atomic configuration in the AI-Cu approximants as well as for the pseudo-5-fold B2 twinning. (C) 2000 Elsevier Science Ltd. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/37019]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | C. Dong,Q. H. Zhang,D. H. Wang,et al. Al-Cu approximants and associated B2 chemical-twinning modes[J]. Micron,2000,31(5):507-514. |
| APA | C. Dong,Q. H. Zhang,D. H. Wang,&Y. M. Wang.(2000).Al-Cu approximants and associated B2 chemical-twinning modes.Micron,31(5),507-514. |
| MLA | C. Dong,et al."Al-Cu approximants and associated B2 chemical-twinning modes".Micron 31.5(2000):507-514. |
入库方式： OAI收割
来源：金属研究所
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