Structural origin for composition-dependent nearest atomic distance in Cu-Zr metallic glass

doi:10.1088/1674-1056/acce99

Abstract We systematically investigate the structures of Cu-Zr metallic glass (MG) by varying the Cu concentration in classic molecular-dynamics simulation. From the pair distribution functions (PDFs), it is found that the nearest atomic distance between Zr atom and Zr atom increases significantly after adding Cu, which is related to the composition-dependent coordination behavior between Cu atom and Zr atom in the nearest neighbors. The portion of PDF related to the nearest connection is decomposed into the contributions from quadrilateral structure, pentagonal structure, hexagonal structure, and heptagonal bipyramid structure. Although the population of denser structures, i.e. 5-, 6-, and 7-number sharing ones, increases with Cu addition increasing, the connection distances between the central atoms in all these bipyramids increase for Zr-Zr pairs, leading to the expansion of Zr-Zr nearest atomic distance. These results unveil the effect of the interplay between chemical interaction and geometric packing on the atomic-level structure in Cu-Zr metallic glasses.

Keywords: metallic glass structure molecular dynamics

Received: 11 March 2023
Revised: 03 April 2023
Accepted manuscript online: 20 April 2023

PACS:	61.43.Dq	(Amorphous semiconductors, metals, and alloys)
	64.70.pe	(Metallic glasses)

Fund: Project supported by the Open Research Fund of Songshan Lake Materials Laboratory, China (Grant No. 2022SLABFN14).

Corresponding Authors: Hai-Long Peng
E-mail: hailong.peng@csu.edu.cn

Cite this article:

Chi Zhang(张驰), Hua-Shan Liu(刘华山), and Hai-Long Peng(彭海龙) Structural origin for composition-dependent nearest atomic distance in Cu-Zr metallic glass 2023 Chin. Phys. B 32 116101

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Structural origin for composition-dependent nearest atomic distance in Cu-Zr metallic glass

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