Networked interpenetrating connections of icosahedra Effects on shear transformations in metallic glass

被引：216

作者：

Lee, Mirim ^{[1
]}

Lee, Chang-Myeon ^{[1
,2
]}

Lee, Kwang-Ryeol ^{[3
]}

Ma, Evan ^{[4
]}

Lee, Jae-Chul ^{[1
]}

机构：

[1] Korea Univ, Dept Mat Sci & Engn, Seoul 136701, South Korea

[2] Korea Inst Ind Technol, Nano Surface Technol Ctr, Inchon 404254, South Korea

[3] Korea Inst Sci & Technol, Computat Sci Ctr, Seoul 136791, South Korea

[4] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA

来源：

ACTA MATERIALIA | 2011年 / 59卷 / 01期

基金：

美国国家科学基金会; 新加坡国家研究基金会;

关键词：

Amorphous alloy; Metallic glass Short (medium)range order; Plasticity; Molecular dynamics; ZR AMORPHOUS-ALLOYS; MEDIUM-RANGE ORDER; ATOMIC PACKING DENSITY; CU-ZR; MECHANICAL-PROPERTIES; MOLECULAR-DYNAMICS; ELASTOSTATIC STRESS; STRUCTURAL MODEL; DEFORMATION; TEMPERATURE;

D O I：

10.1016/j.actamat.2010.09.020

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The local structures of metallic glasses have been analyzed previously in term of various types of short range order (SRO) However, the SRO alone, neglecting the interconnection of neighboring icosahedra to medium range and beyond, is insufficient to account for the structure property relationship in metallic glasses In this study, we use molecular dynamics (MD) simulations of Cu-Zr binary metallic glasses to examine the effects of the next level of structural hierarchy the interpenetrating connection of icosahedra (ICOI) and the linkage of the medium-range ICOI patches to form networks of icosahedra over extended range The mechanical properties of these metallic glasses, especially the shear transformations that mediate plasticity, are found to be dependent on the degree of ICOI and development of the ICOI network The evolution of the ICOI network during shear deformation, as well as the composition dependence, has been monitored and discussed (C) 2010 Acta Materialia Inc Published by Elsevier Ltd All rights reserved

引用

页码：159 / 170

页数：12

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