Journal ArticleDOI
Indentation induced dislocation nucleation: The initial yield point
Reads0
Chats0
TLDR
In this article, a model based upon discretized dislocations is proposed for both the initiation of yielding at an upper yield point and the arrest of the indenter at a lower yield point.About:
This article is published in Acta Materialia.The article was published on 1996-09-01. It has received 383 citations till now. The article focuses on the topics: Yield (engineering) & Dislocation.read more
Citations
More filters
Journal ArticleDOI
Dislocation nucleation and defect structure during surface indentation
TL;DR: In this paper, an atomistic imaging of dislocation nucleation during displacement controlled indentation on a passivated surface is presented, where defects are located and imaged by local deviations from centrosymmetry.
Journal ArticleDOI
Mechanical behavior of nanocrystalline metals and alloys
TL;DR: In this article, the authors present an overview of the mechanical properties of nanocrystalline metals and alloys with the objective of assessing recent advances in the experimental and computational studies of deformation, damage evolution, fracture and fatigue, and highlighting opportunities for further research.
Journal ArticleDOI
Size dependence of mechanical properties of gold at the micron scale in the absence of strain gradients
TL;DR: In this article, the authors used uniaxial compression experiments on Au cylinders at the sub-micron scale, without stress/strain gradients, and determined compression stress, strain, and stiffness of the pillars.
Journal ArticleDOI
Computational modeling of the forward and reverse problems in instrumented sharp indentation
TL;DR: In this article, a comprehensive computational study was undertaken to identify the extent to which elasto-plastic properties of ductile materials could be determined from instrumented sharp indentation and to quantify the sensitivity of such extracted properties to variations in the measured indentation data.
Journal ArticleDOI
Nanoscale gold pillars strengthened through dislocation starvation
Julia R. Greer,William D. Nix +1 more
TL;DR: In this article, the authors showed that submicrometer sized gold crystals can be 50 times stronger than their bulk counterparts due to the elimination of defects from the crystal in the course of deformation.
References
More filters
Journal ArticleDOI
An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments
Warren C. Oliver,George M. Pharr +1 more
TL;DR: In this paper, the authors used a Berkovich indenter to determine hardness and elastic modulus from indentation load-displacement data, and showed that the curve of the curve is not linear, even in the initial stages of the unloading process.
Journal ArticleDOI
Dislocation nucleation from a crack tip : an analysis based on the Peierls concept
TL;DR: In this paper, a periodic relation between shear stress and atomic shear displacement is assumed to hold along the most highly stressed slip plane emanating from a crack tip, which allows some small slip displacement to occur near the tip in response to small applied loading and, with increase in loading, the incipient dislocation configuration becomes unstable and leads to a fully formed dislocation which is driven away from the crack.
Journal ArticleDOI
Microdeformation of Solids
N. Gane,Frank Philip Bowden +1 more
TL;DR: In this article, a very fine stylus is pressed against the surface of a metal crystal with a load which can be as small as 10−4 g, and the deformation observed simultaneously by performing the experiment in a scanning electron microscope.
Journal ArticleDOI
Microscratch and load relaxation tests for ultra-thin films
TL;DR: The microindenter has proven to be a powerful device in the characterization of the mechanical properties of thin films as discussed by the authors, which allows for other mechanical properties, in addition to hardness, to be acquired.
Journal ArticleDOI
Contact of characterised metal surfaces at very low loads: Deformation and adhesion
John B. Pethica,David Tabor +1 more
TL;DR: In this article, a study of the contact between metal specimens in an UHV scanning electron microscope incorporating an Auger facility for characterising the surfaces in situ is described, and the results show that with clean surfaces, the loading-unloading cycle is not reversible.
Related Papers (5)
An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments
Warren C. Oliver,George M. Pharr +1 more