Atomic structure of shear bands in Cu64Zr36 metallic glasses studied by molecular dynamics simulations

被引：119

作者：

Feng, Shidong ^{[1
]}

Qi, Li ^{[1
]}

Wang, Limin ^{[1
]}

Pan, Shaopeng ^{[2
]}

Ma, Mingzhen ^{[1
]}

Zhang, Xinyu ^{[1
]}

Li, Gong ^{[1
,3
]}

Liu, Riping ^{[1
]}

机构：

[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China

[2] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Peoples R China

[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

来源：

ACTA MATERIALIA | 2015年 / 95卷

基金：

中国国家自然科学基金;

关键词：

Metallic glass; Shear bands; Atomic structure; Molecular dynamics simulations; MEDIUM-RANGE ORDER; MECHANICAL-BEHAVIOR; PLASTIC-FLOW; CU; DEFORMATION; PACKING; ALLOYS; LOCALIZATION; DIFFRACTION; NUCLEATION;

D O I：

10.1016/j.actamat.2015.05.047

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Molecular dynamics simulations on the atomic structure of shear bands (SBs) in Cu64Zr36 metallic glasses are presented. Results show that the atoms in the SB move desultorily, in contrast to those in the matrix. The saturated degree of bonded pairs considering the "liquid-like" character of SB quantitatively provides important details in extending earlier studies on SBs. Zr-centered < 0, 2, 8, 5 > clusters exhibit strong spatial correlations and tendency to connect with each other in short-range order. The < 0, 2, 8, 5 > cluster-type medium-range order is the main feature inside the SB relative to the matrix. The fractal results demonstrate the planar-like fashion of the < 0, 2, 8, 5 > network in SB, forming an interpenetrating solid-like backbone. Such heterogeneous structure provides a fundamental structural perspective of mechanical instability in SB. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：236 / 243

页数：8

共 87 条

[61] Progressive shear band propagation in metallic glasses under compression [J].

Qu, R. T. ;

Liu, Z. Q. ;

Wang, G. ;

Zhang, Z. F. .

ACTA MATERIALIA, 2015, 91 :19-33

[62] Embrittlement of a bulk metallic glass due to low-temperature annealing [J].

Ramamurty, U ;

Lee, ML ;

Basu, J ;

Li, Y .

SCRIPTA MATERIALIA, 2002, 47 (02) :107-111

[63] INTERPRETATION OF PROTEIN STRUCTURES - TOTAL VOLUME, GROUP VOLUME DISTRIBUTIONS AND PACKING DENSITY [J].

RICHARDS, FM .

JOURNAL OF MOLECULAR BIOLOGY, 1974, 82 (01) :1-14

[64] Yield stress in metallic glasses: The jamming-unjamming transition studied through Monte Carlo simulations based on the activation-relaxation technique [J].

Rodney, David ;

Schuh, Christopher A. .

PHYSICAL REVIEW B, 2009, 80 (18)

[65] Distribution of Thermally Activated Plastic Events in a Flowing Glass [J].

Rodney, David ;

Schuh, Christopher .

PHYSICAL REVIEW LETTERS, 2009, 102 (23)

[66] Atomistic basis for the plastic yield criterion of metallic glass [J].

Schuh, CA ;

Lund, AC .

NATURE MATERIALS, 2003, 2 (07) :449-452

[67] Overview No.144 - Mechanical behavior of amorphous alloys [J].

Schuh, Christopher A. ;

Hufnagel, Todd C. ;

Ramamurty, Upadrasta .

ACTA MATERIALIA, 2007, 55 (12) :4067-4109

[68] Atomic packing and short-to-medium-range order in metallic glasses [J].

Sheng, HW ;

Luo, WK ;

Alamgir, FM ;

Bai, JM ;

Ma, E .

NATURE, 2006, 439 (7075) :419-425

[69] Does metallic glass have a backbone? The role of percolating short range order in strength and failure [J].

Shi, Y ;

Falk, ML .

SCRIPTA MATERIALIA, 2006, 54 (03) :381-386

[70] Strain localization and percolation of stable structure in amorphous solids [J].

Shi, YF ;

Falk, ML .

PHYSICAL REVIEW LETTERS, 2005, 95 (09)

← 1 2 3 4 5 6 7 8 9 →