Atomic-scale origin of shear band multiplication in heterogeneous metallic glasses

被引：89

作者：

Sopu, D. ^{[1
,2
]}

Scudino, S. ^{[3
]}

Bian, X. L. ^{[2
]}

Gammer, C. ^{[2
]}

Eckert, J. ^{[2
,4
]}

机构：

[1] Tech Univ Darmstadt, Inst Mat Wissensch, D-64287 Darmstadt, Germany

[2] Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria

[3] IFW Dresden, Inst Complex Mat, Helmholtzstr 20, D-01069 Dresden, Germany

[4] Univ Leoben, Dept Mat Sci, Jahnstr 12, A-8700 Leoben, Austria

来源：

SCRIPTA MATERIALIA | 2020年 / 178卷

基金：

欧洲研究理事会;

关键词：

Metallic glasses; Shear band formation; Shear transformation zones; Molecular dynamics simulations; Plasticity; DYNAMICS; DEFORMATION; PROPAGATION; PLASTICITY; ORDER;

D O I：

10.1016/j.scriptamat.2019.11.006

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Using molecular dynamics simulations, we provide an atomistic description of the shear band multiplication mechanisms in a heterogeneous metallic glass consisting of two distinct amorphous regions with different amounts of free volume and degrees of short-range order. The structural differences and elastic fluctuations encountered by the developing shear band while crossing the interface between the two regions alter the autocatalytic activation of the shear transformation zones (STZs) and, subsequently, lead to shear band branching. The two-unit STZ-vortex mechanism sheds light on the correlation between the strain distribution during tensile deformation and the directional characteristics of the STZ activation process. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：57 / 61

页数：5

共 38 条

[1] PLASTIC-DEFORMATION IN METALLIC GLASSES
ARGON, AS
[J]. ACTA METALLURGICA, 1979, 27 (01): : 47 - 58
[2] Controlling the distribution of structural heterogeneities in severely deformed metallic glass
Bian, X. L.
Zhao, D.
Kim, J. T.
Sopu, D.
Wang, G.
Pippan, R.
Eckert, J.
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2019, 752 : 36 - 42
[3] Voronoi polyhedra and Delaunay simplexes in the structural analysis of molecular-dynamics-simulated materials
Brostow, W
Chybicki, M
Laskowski, R
Rybicki, J
[J]. PHYSICAL REVIEW B, 1998, 57 (21): : 13448 - 13458
[4] Structural processes that initiate shear localization in metallic glass
Cao, A. J.
Cheng, Y. Q.
Ma, E.
[J]. ACTA MATERIALIA, 2009, 57 (17) : 5146 - 5155
[5] Fractal atomic-level percolation in metallic glasses
Chen, David Z.
Shi, Crystal Y.
An, Qi
Zeng, Qiaoshi
Mao, Wendy L.
Goddard, William A., III
Greer, Julia R.
[J]. SCIENCE, 2015, 349 (6254) : 1306 - 1310
[6] A Taylor vortex analogy in granular flows
Conway, SL
Shinbrot, T
Glasser, BJ
[J]. NATURE, 2004, 431 (7007) : 433 - 437
[7] Identification and characterization of potential shear transformation zones in metallic glasses
Delogu, Francesco
[J]. PHYSICAL REVIEW LETTERS, 2008, 100 (25)
[8] Demetriou MD, 2011, NAT MATER, V10, P123, DOI [10.1038/nmat2930, 10.1038/NMAT2930]
[9] Forterre Y, 2001, PHYS REV LETT, V86, P5886, DOI 10.1103/PhysRevLett86.5886
[10] Microstructure controlled shear band pattern formation and enhanced plasticity of bulk metallic glasses containing in situ formed ductile phase dendrite dispersions
Hays, CC
Kim, CP
Johnson, WL
[J]. PHYSICAL REVIEW LETTERS, 2000, 84 (13) : 2901 - 2904

← 1 2 3 4 →