Polyamorphism in a metallic glass
文献类型：期刊论文
| 作者 | Sheng, H. W.; Liu, H. Z.; Cheng, Y. Q.; Wen, J.; Lee, P. L.; Luo, W. K.; Shastri, S. D.; Ma, E. |
| 刊名 | NATURE MATERIALS
 |
| 出版日期 | 2007-03-01 |
| 卷号 | 6期号:3页码:192-197 |
| ISSN号 | 1476-1122 |
| DOI | 10.1038/nmat1839 |
| 通讯作者 | Sheng, H. W.(hwsheng@jhu.edu) |
| 英文摘要 | A metal, or an alloy, can often exist in more than one crystal structure. The face-centred-cubic and body-centred-cubic forms of iron (or steel) are a familiar example of such polymorphism. When metallic materials are made in the amorphous form, is a parallel 'polyamorphism' possible? So far, polyamorphic phase transitions(1-7) in the glassy state have been observed only in glasses involving directional and open (such as tetrahedral(4,5)) coordination environments. Here, we report an in situ X-ray diffraction observation of a pressure-induced transition between two distinct amorphous polymorphs in a Ce(55)Al(45) metallic glass. The large density difference observed between the two polyamorphs is attributed to their different electronic and atomic structures, in particular the bond shortening revealed by ab initio modelling of the effects of f-electron delocalization(8-10). This discovery offers a new perspective of the amorphous state of metals, and has implications for understanding the structure, evolution and properties of metallic glasses and related liquids. Our work also opens a new avenue towards technologically useful amorphous alloys that are compositionally identical but with different thermodynamic, functional and rheological properties(11) due to different bonding and structural characteristics. |
| WOS研究方向 | Chemistry ; Materials Science ; Physics |
| 语种 | 英语 |
| 出版者 | NATURE PUBLISHING GROUP |
| WOS记录号 | WOS:000244570700016 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/92473]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Sheng, H. W. |
| 作者单位 | 1.Argonne Natl Lab, Adv Photon Source, XOR, Argonne, IL 60439 USA 2.Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA 3.Carnegie Inst Washington, HPCAT, Geophys Lab, Argonne, IL 60439 USA 4.Harbin Inst Technol, Ctr Condensed Matter Sci & Technol, Harbin 150080, Peoples R China 5.Chinese Acad Sci, Met Res Inst, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sheng, H. W.,Liu, H. Z.,Cheng, Y. Q.,et al. Polyamorphism in a metallic glass[J]. NATURE MATERIALS,2007,6(3):192-197. |
| APA | Sheng, H. W..,Liu, H. Z..,Cheng, Y. Q..,Wen, J..,Lee, P. L..,...&Ma, E..(2007).Polyamorphism in a metallic glass.NATURE MATERIALS,6(3),192-197. |
| MLA | Sheng, H. W.,et al."Polyamorphism in a metallic glass".NATURE MATERIALS 6.3(2007):192-197. |
入库方式： OAI收割
来源：金属研究所
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