Polyamorphism in a metallic glass

doi:10.1038/nmat1839

IMR OpenIR

	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.
通讯作者	Sheng, H. W.(hwsheng@jhu.edu)
	2007-03-01
发表期刊	NATURE MATERIALS
ISSN	1476-1122
卷号	6 期号:3 页码:192-197
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.
DOI	10.1038/nmat1839
收录类别	SCI
语种	英语
WOS研究方向	Chemistry ; Materials Science ; Physics
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000244570700016
出版者	NATURE PUBLISHING GROUP
引用统计	被引频次：367[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/92474
专题	中国科学院金属研究所
通讯作者	Sheng, H. W.
作者单位	1.Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA 2.Carnegie Inst Washington, HPCAT, Geophys Lab, Argonne, IL 60439 USA 3.Harbin Inst Technol, Ctr Condensed Matter Sci & Technol, Harbin 150080, Peoples R China 4.Chinese Acad Sci, Met Res Inst, Shenyang 110016, Peoples R China 5.Argonne Natl Lab, Adv Photon Source, XOR, Argonne, IL 60439 USA
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.