Emergence of strain-rate sensitivity in Cu nanopillars: Transition from dislocation multiplication to dislocation nucleation
We demonstrate strain-rate sensitivity emerging in single-crystalline Cu nanopillars with
diameters ranging from 75 up to 500nm through uniaxial deformation experiments …
diameters ranging from 75 up to 500nm through uniaxial deformation experiments …
Surface-controlled dislocation multiplication in metal micropillars
CR Weinberger, W Cai - Proceedings of the National …, 2008 - National Acad Sciences
Understanding the plasticity and strength of crystalline materials in terms of the dynamics of
microscopic defects has been a goal of materials research in the last 70 years. The size …
microscopic defects has been a goal of materials research in the last 70 years. The size …
Emergence of enhanced strengths and Bauschinger effect in conformally passivated copper nanopillars as revealed by dislocation dynamics
The ability to precisely control the surface state of a nanostructure may offer a pathway
towards tuning the mechanical properties of small-scale metallic components. In our …
towards tuning the mechanical properties of small-scale metallic components. In our …
Impact of instrumental constraints and imperfections on the dislocation structure in micron-sized Cu compression pillars
In situ micro-Laue diffraction was used to study the plasticity in three 7μm, initially identical,
single-crystalline Cu pillars during compression. Movements of the Laue spot as well as …
single-crystalline Cu pillars during compression. Movements of the Laue spot as well as …
Modeling dislocation nucleation strengths in pristine metallic nanowires under experimental conditions
The nature of dislocation sources in small-scale metals is critical to understanding and
building models of size-dependent crystalline strength at the nanoscale. Pre-existing …
building models of size-dependent crystalline strength at the nanoscale. Pre-existing …
Source-controlled yield and hardening of Cu (1 0 0) studied by in situ transmission electron microscopy
In the present work we investigate the mechanical properties of multiple slip oriented single
crystal Cu (100) compression samples to shed light on size-dependent yield and hardening …
crystal Cu (100) compression samples to shed light on size-dependent yield and hardening …
Higher compressive strengths and the Bauschinger effect in conformally passivated copper nanopillars
Our current understanding of size-dependent strength in nano-and microscale crystals is
centered around the idea that the overall strength is determined by the stress required to …
centered around the idea that the overall strength is determined by the stress required to …
Sample shape and temperature strongly influence the yield strength of metallic nanopillars
A Cao, E Ma - Acta Materialia, 2008 - Elsevier
For bulk face-centered cubic metals in conventional tests, the effects of sample shape on the
yield stress are negligibly small, and the strength dependence on temperature is very weak …
yield stress are negligibly small, and the strength dependence on temperature is very weak …
Influence of homogeneous interfaces on the strength of 500 nm diameter Cu nanopillars
Interfaces play an important role in crystalline plasticity as they affect strength and often
serve as obstacles to dislocation motion. Here we investigate effects of grain and nanotwin …
serve as obstacles to dislocation motion. Here we investigate effects of grain and nanotwin …
Quantitative evidence of crossover toward partial dislocation mediated plasticity in copper single crystalline nanowires
In situ tensile tests of Cu single crystalline nanowires in a high-resolution transmission
electron microscope reveal a novel effect of sample dimensions on plasticity mechanisms …
electron microscope reveal a novel effect of sample dimensions on plasticity mechanisms …