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Indexed by:期刊论文

Date of Publication:2011-06-15

Journal:JOURNAL OF APPLIED PHYSICS

Included Journals:SCIE、EI

Volume:109

Issue:12

ISSN No.:0021-8979

Abstract:We have performed ab initio molecular dynamics simulation of Cu64Zr36 alloy at descending temperatures (from 2000 K to 400 K) and discussed the evolution of short-range order with temperature. The pair-correlation functions, coordination numbers, and chemical compositions of the most abundant local clusters have been analyzed. We found that icosahedral short-range order exists in the liquid, undercooled, and glass states, and it becomes dominant in the glass states. Moreover, we demonstrated the existence of Cu-centered Cu8Zr5 icosahedral clusters as the major local structural unit in the Cu64Zr36 amorphous alloy. This finding agrees well with our previous cluster model of Cu-Zr-based BMG as well as experimental evidences from synchrotron x ray and neutron diffraction measurements. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3599882]