Temperature and strain-rate dependence of surface dislocation nucleation

T Zhu, J Li, A Samanta, A Leach, K Gall - Physical Review Letters, 2008 - APS
… The free surface may act as an effective source of dislocations to initiate and … dislocation
nucleation. We show the activation volume associated with surface dislocation nucleation is …

Emergence of strain-rate sensitivity in Cu nanopillars: Transition from dislocation multiplication to dislocation nucleation

AT Jennings, J Li, JR Greer - Acta Materialia, 2011 - Elsevier
… We demonstrate strain-rate sensitivity emerging in single-crystalline Cu nanopillars with …
at different constant strain rates. In the range of pillar diameters and strain rates tested, we find …

New perspectives in plasticity theory: dislocation nucleation, waves, and partial continuity of plastic strain rate

A Acharya, A Beaudoin, R Miller - … and Mechanics of Solids, 2008 - journals.sagepub.com
… for nucleation involves the … dislocation nucleation and dislocation motion can be readily
understood through atomistic simulations. Here, we focus our attention on dislocation nucleation

In situ observation of dislocation nucleation and escape in a submicrometre aluminium single crystal

SH Oh, M Legros, D Kiener, G Dehm - Nature materials, 2009 - nature.com
… However, a sudden increase in strain rate to 10 −3 s −1 causes a noticeable surge in
dislocation density as the nucleation rate outweighs the loss rate. This observation indicates that …

A new strain-rate-induced deformation mechanism of Cu nanowire: Transition from dislocation nucleation to phase transformation

H Xie, F Yin, T Yu, G Lu, Y Zhang - Acta Materialia, 2015 - Elsevier
… On the other hand, if we reduce the applied strain rate to a certain level, the plastic … into a
dislocation nucleation mechanism. Based on the present study we have proposed a strain rate–…

Predicting the dislocation nucleation rate as a function of temperature and stress

S Ryu, K Kang, W Cai - Journal of Materials Research, 2011 - cambridge.org
… predict the dislocation nucleation rate based on the Becker–Döring theory of nucleation and
… if we replace E by the shear modulus l and the uniaxial strain rate e by c. However, because …

On the nucleation and growth of voids at high strain-rates

J Belak - Journal of computer-aided materials design, 1998 - Springer
… homogeneous nucleation of voids in single crystal copper and the heterogeneous nucleation
… The simulations suggest void growth occurs through anisotropic dislocation nucleation and …

Atomistic interpretation of extra temperature and strain-rate sensitivity of heterogeneous dislocation nucleation in a multi-principal-element alloy

SC Dai, ZC Xie, YJ Wang - International Journal of Plasticity, 2022 - Elsevier
… Here we study the heterogeneous dislocation nucleation behaviors from an existing
nanoscale void embedded in a prototypical multi-principal-element (MPE) NiCoCr alloy via …

Measuring surface dislocation nucleation in defect-scarce nanostructures

LY Chen, M He, J Shin, G Richter, DS Gianola - Nature materials, 2015 - nature.com
dislocation nucleation in … dislocation nucleation is the predominant mechanism underlying
plastic yielding. We have probed the quasi-static tensile response over a range of strain rates, …

Entropic effect on the rate of dislocation nucleation

S Ryu, K Kang, W Cai - Proceedings of the National …, 2011 - National Acad Sciences
… of dislocation nucleation, but its limited timescale remains a significant challenge for …
nucleation at experimentally relevant conditions. Here we show that dislocation nucleation rates can …