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The Investigation of Plastic Behavior by Discrete Dislocation Dynamics for Single Crystal Pillar at Submicron Scale

Part of the Springer Theses Book Series

DOI: 10.1007/978-981-10-3032-1

ISBN: 978-981-10-3031-4

Publisher: Springer Singapore - Springer Journals

Oct 27, 2016

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Chapter 1Introduction

Cui, Yinan

Pages: 1 –20

[Over the past decade, submicron crystals with characteristic size ranging from several hundred nanometers to several micrometers have attracted continuous interest. Their unique particular properties make them exhibit great promise for applications in microdevices and small-scale structures. At...
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Chapter 2Discrete-Continuous Model of Crystal Plasticity

Cui, Yinan

Pages: 21 –55

[Although the multi-scale discrete-continuous model (DCM) which couples discrete dislocation dynamics (DDD) and finite element method (FEM) to study crystal plasticity at submicron scale has been proposed for many years, some key issues are still not well addressed yet. First, a new...
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Chapter 3Single Arm Dislocation Source Controlled Plastic Flow in FCC Micropillars

Cui, Yinan

Pages: 57 –77

[The ‘dislocation source’ controlled plastic behaviors in submicron single crystals, which differ significantly from macroscopic plastic flow, are widely observed in recent in-situ TEM tests. In this work, single arm source (SAS) controlled plastic flow in the micropillars with diameter ranging...
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Chapter 4Confined Plasticity in Micropillars

Cui, Yinan

Pages: 79 –106

[Multiscale dislocation dynamic simulations are systematically carried out to reveal the dislocation mechanism controlling the confined plasticity in coated micropillar. It is found that the operation of single arm source (SAS) controls the plasticity in coated micropillar and a modified...
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Chapter 5Mechanical Annealing Under Low Amplitude Cyclic Loading in Micropillars

Cui, Yinan

Pages: 107 –127

[Mechanical annealing is an effective method to drive the dislocations out of the submicron sample. However, simultaneously significant shape change is always generated by plastic deformation under monotonic loading. In the present work, through discrete dislocation dynamic simulation, we find...
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Chapter 6Conclusions and Outlook

Cui, Yinan

Pages: 129 –131

[At submicron scale, new physical pictures excitingly emerge. The “smaller is stronger” size effect raise the possibility of designing new high strength materials by tuning external size. The power law scaling “intermittent plasticity” implies a connection with other nonequilibrium natural...

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