Formation of prismatic dislocation loops during unloading in nanoindentation

被引：9

作者：

Yu, Haiyang ^{[1
]}

Cocks, Alan C. F. ^{[2
]}

Tarleton, Edmund ^{[1
,2
]}

机构：

[1] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

[2] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

来源：

SCRIPTA MATERIALIA | 2020年 / 189卷

基金：

英国工程与自然科学研究理事会;

关键词：

Nanoindentation; Prismatic loops; Discrete dislocation dynamics; DEFORMATION; GENERATION;

D O I：

10.1016/j.scriptamat.2020.07.062

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The formation of prismatic dislocation loops during nanoindentation of bcc iron is simulated with discrete dislocation plasticity. Interestingly, it is not the loading phase, but the unloading phase of the test which is found to be crucial for prismatic loop formation when indenting a (001) crystal surface. In this case, prismatic loops do not form during loading, but develop as the indenter is removed, in contrast to (111) indentation where prismatic loops are nucleated almost immediately upon loading. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：112 / 116

页数：5

共 21 条

[1] Planar Defect Nucleation and Annihilation Mechanisms in Nanocontact Plasticity of Metal Surfaces [J].

Alcala, Jorge ;

Dalmau, Roger ;

Franke, Oliver ;

Biener, Monika ;

Biener, Juergen ;

Hodge, Andrea .

PHYSICAL REVIEW LETTERS, 2012, 109 (07)

[2] Nanoindentation of hcp metals: a comparative simulation study of the evolution of dislocation networks [J].

Alhafez, Iyad Alabd ;

Ruestes, Carlos J. ;

Gao, Yu ;

Urbassek, Herbert M. .

NANOTECHNOLOGY, 2016, 27 (04)

[3] Dislocation nucleation in bcc Ta single crystals studied by nanoindentation [J].

Biener, Monika M. ;

Biener, Juergen ;

Hodge, Andrea M. ;

Hamza, Alex V. .

PHYSICAL REVIEW B, 2007, 76 (16)

[4] Calculating dislocation displacements on the surface of a volume [J].

Bromage, B. ;

Tarleton, E. .

MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING, 2018, 26 (08)

[5] Suppression of Localized Plastic Flow in Irradiated Materials [J].

Cui, Yinan ;

Po, Giacomo ;

Ghoniem, Nasr .

SCRIPTA MATERIALIA, 2018, 154 :34-39

[6] Orientation-dependent indentation response of helium-implanted tungsten [J].

Das, Suchandrima ;

Yu, Hongbing ;

Tarleton, Edmund ;

Hofmann, Felix .

APPLIED PHYSICS LETTERS, 2019, 114 (22)

[7] Origin of double-peak precipitation hardening in metallic alloys [J].

Fan, Haidong ;

Ngan, Alfonso H. W. ;

Gan, Kefu ;

El-Awad, Jaafar A. .

INTERNATIONAL JOURNAL OF PLASTICITY, 2018, 111 :152-167

[8] Three-dimensional modeling of indent-induced plastic zone at a mesoscale [J].

Fivel, MC ;

Robertson, CF ;

Canova, GR ;

Boulanger, L .

ACTA MATERIALIA, 1998, 46 (17) :6183-6194

[9] Molecular dynamics simulation of plasticity in VN(001) crystals under nanoindentation with a spherical indenter [J].

Fu, Tao ;

Peng, Xianghe ;

Wang, Chen ;

Lin, Zijun ;

Chen, Xiaosheng ;

Hu, Ning ;

Wang, Zhongchang .

APPLIED SURFACE SCIENCE, 2017, 392 :942-949

[10] Formation of extended prismatic dislocation structures under indentation [J].

Gagel, J. ;

Weygand, D. ;

Gumbsch, P. .

ACTA MATERIALIA, 2016, 111 :399-406

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