iMechanica - activation volume
https://imechanica.org/taxonomy/term/1745
enSurface dislocation nucleation
https://imechanica.org/node/2617
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/605">Dislocation</a></div><div class="field-item odd"><a href="/taxonomy/term/1744">nanowire</a></div><div class="field-item even"><a href="/taxonomy/term/1745">activation volume</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
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<img class="image img_assist_properties" src="/files/images/image005_2.img_assist_properties.png" alt="Surface dislocation nucleation" title="Surface dislocation nucleation" width="157" height="200" align="baseline" /></p>
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<span>Ting Zhu, Ju Li, Amit <span class="spelle"><span>Samanta</span></span>, Austin Leach and Ken Gall, “Temperature and strain-rate dependence of surface dislocation nucleation”, <em>Physical Review Letters</em>, 100, 025502 (2008).</span>
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<p><span><span>Dislocation nucleation is essential to the plastic deformation of small-volume crystalline solids. The free surface may act as an effective source of dislocations to initiate and sustain plastic flow, in conjunction with bulk sources. Here, we develop an atomistic modeling framework to address the probabilistic nature of surface dislocation nucleation. We show the activation volume associated with surface dislocation nucleation is characteristically in the range of 1-10b^3, where b is the Burgers vector. Such small activation volume leads to sensitive temperature and strain-rate dependence of the nucleation stress, providing an upper bound to the size-strength relation in nanopillar compression experiments.</span></span></p>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/SurfaceDislocationNucleation.pdf" type="application/pdf; length=349348" title="SurfaceDislocationNucleation.pdf">SurfaceDislocationNucleation.pdf</a></span></td><td>341.16 KB</td> </tr>
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</div></div></div>Thu, 24 Jan 2008 16:24:57 +0000Ting Zhu2617 at https://imechanica.orghttps://imechanica.org/node/2617#commentshttps://imechanica.org/crss/node/2617Error | iMechanica