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论文类型：期刊论文

发表时间：2013-07-22

发表刊物：APPLIED PHYSICS LETTERS

收录刊物：SCIE、EI、Scopus

卷号：103

期号：4

ISSN号：0003-6951

摘要：We show by molecular dynamics simulations that symmetrical quasi-icosahedral structures can be formed in fivefold twinned metallic nanowires (Cu, Au, and Ag) under dynamic tensile loading. The quasi-icosahedral structure, different from the icosahedral nanoclusters found in the past, consists of a twisted original fivefold twinned axis and ten secondary fivefold deformation twins, with five preexisting prismatic and fifteen tetrahedral subunits joined adjacently. Formation of these structures is observed in the necking region during the plastic deformation with successive twinning processes and is found to be independent on the cross-sectional shape as well as the tensile strain rate of the nanowires. (C) 2013 AIP Publishing LLC.