Polyamorphism in a metallic glass

doi:10.1038/nmat1839

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	Polyamorphism in a metallic glass
	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
	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
内容类型	期刊论文
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.