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Showing papers in "Acta Materialia in 2005"


Journal ArticleDOI
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.

1,387 citations


Journal ArticleDOI
TL;DR: In this article, a dislocation pile-up-based Hall-Petch model is used to estimate the peak strength of the multi-layer flow strength as a function of length scale from greater than a micrometer to less than a nanometer.

896 citations


Journal ArticleDOI
TL;DR: In this article, the authors present models for the emission of partial or perfect dislocations from stress concentrations at a grain boundary or twin boundary, and find that the models lead to estimates of activation volumes in the range 3 − 10 b 3 for truly nanocrystalline metals.

715 citations


Journal ArticleDOI
TL;DR: A review of the results of recent molecular-dynamics simulations of the structure and deformation behavior of nanocrystalline materials can be found in this article, where the authors provide insights into the intricate interplay between the dislocation and GB processes responsible for this crossover.

642 citations


Journal ArticleDOI
TL;DR: In this paper, a direct assessment of the crystal-size dependence of the critical resolved shear stress has been made for single-slip oriented crystals of pure Ni having sample diameters that range from 40 to 1.0 μm.

640 citations


Journal ArticleDOI
TL;DR: In this article, the authors investigated the rate sensitivity of flow stress and the extent of strengthening in polycrystalline copper containing different volume fractions of nano-sized twins, but having the same average grain size.

620 citations


Journal ArticleDOI
TL;DR: In this article, an experimental study on the mechanical and structural gradients through the cuticle of Homarus americanus (American lobster) has been conducted to investigate the role of the internal structure of the twisted plywood structure and of the interface between the two cuticle layers for the overall mechanical behavior of the exoskeleton.

452 citations


Journal ArticleDOI
TL;DR: In this paper, the authors performed in situ X-ray diffraction measurements at a synchrotron source in order to study the thermal stability of the retained austenite phase in transformation induced plasticity steels during cooling from room temperature to 100 K.

441 citations


Journal ArticleDOI
TL;DR: In this article, a ball milling-based in situ consolidation technique was used to produce fully dense nanocrystalline Cu samples centimeters in lateral dimensions and about one millimeter in thickness.

435 citations


Journal ArticleDOI
TL;DR: In this article, the evolution of the current density and temperature distribution in the punch-die-sample set-up during field activated sintering (FAST), also known as spark plasma or pulsed electric current sinterings, was modelled by finite element calculations supported by in situ measured electrical and thermal input data.

427 citations


Journal ArticleDOI
TL;DR: In this article, the authors show that the grain refinement process is driven by grain subdivision at the colder periphery of the tools deformation zone, and the geometric effects of strain, which together reduce the overall high angle boundary spacing with increasing deformation.

Journal ArticleDOI
TL;DR: In this article, the average size of the Ag nanoparticles is around 11 nm, and each particle is covered with an organic shell, which has the outstanding feature that each nanoparticle exists independently and removal of the organic shell is necessary to bring out characteristics of the nanoparticle.

Journal ArticleDOI
TL;DR: In this paper, a model was proposed to explain the deformation behaviors in ultrafine-grained (UFG) aluminum, which showed an evident transition of tensile deformation behavior appeared in commercial purity aluminum as the grain size reduced from micrometer to submicrometer range.

Journal ArticleDOI
TL;DR: The edge-to-edge matching model for describing the interfacial crystallographic characteristics between two phases that are related by reproducible orientation relationships has been applied to the typical grain refiners in aluminum alloys as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the susceptibility of bulk metallic glass (BMG) to embrittlement upon annealing at temperatures below its glass transition temperature, and found that the reduction of free volume due to annaling is the primary mechanism responsible for the loss in toughness.

Journal ArticleDOI
TL;DR: When a turbine airfoil attains temperatures that allow calcium-magnesium-alumino-silicate (CMAS) infiltration into the thermal barrier coating (TBC), a new mechanism of in-service spalling may be activated.

Journal ArticleDOI
TL;DR: In this paper, a method based on electron back-scattering diffraction (EBSD) measurements was used to identify activated slip systems, which allowed a statistical analysis of the nature (basal, prismatic, pyramidal) and distribution of the slip systems according to the crystallographic texture.

Journal ArticleDOI
TL;DR: In this paper, the contribution of free volume in glassy materials and metallic glasses was measured by X-ray diffraction in transmission during heating using synchrotron light, and the measured thermal expansion coefficients αth were the same as in dilatometry.

Journal ArticleDOI
TL;DR: In this paper, the initial microstructure and local deformation mechanisms of polyurethane foam during a compression test are investigated by means of X-ray microtomography.

Journal ArticleDOI
TL;DR: In this article, the effect of welding on precipitation in the 2024 alloy in the T351 and the T6 states, using small angle X-ray scattering, transmission electron microscopy, differential scanning calorimetry and hardness measurements.

Journal ArticleDOI
TL;DR: In this paper, the mechanisms governing twin-induced strain hardening of high-purity α-titanium at room temperature were incorporated into constitutive laws to describe the evolution of both twin and slip resistance due to deformation twinning.

Journal ArticleDOI
TL;DR: In this article, the shape of the elements suggests the continuous formation of new elements during steady-state deformation, which would be a process similar to dynamic recrystallisation.

Journal ArticleDOI
TL;DR: In this paper, high purity bright Sn, Sn-Cu and Sn-Pb layers, 3, 7 and 16 lm thick, were electrodeposited on phosphor bronze cantilever beams in a rotating disk apparatus.

Journal ArticleDOI
TL;DR: In this paper, the authors used a common strain gradient plasticity approach to explain the size effect of bending beams with a nano-indenter and a dislocation pile-up at the beam center.

Journal ArticleDOI
TL;DR: In this article, the mechanical properties of an ultrafine grained 0.2%C-Mn steel, processed by large strain warm deformation and subsequent annealing, have been investigated.

Journal ArticleDOI
TL;DR: In this article, a model for studying the domain pattern of ferroelectric materials and its evolution is developed, and the electrostatic potential is made explicit, and consequently the model is able to predict the micro-structural evolution and the macro-scopic behavior of Ferroelectrics subjected to realistic electro-mechanical boundary conditions.

Journal ArticleDOI
TL;DR: In this paper, a wide range of textures which evolve during equal channel angular extrusion (ECAE) of magnesium alloys were investigated, and the fact that different alloys exhibit different texture evolutions is an indication of distinctions in the balance of deformation mechanisms which operate within the different alloy.

Journal ArticleDOI
TL;DR: In this paper, an experimental investigation into the Vickers hardness and associated plastic deformation in as-cast and annealed Pd42Ni40P18 bulk metallic glass was conducted, and the deformation morphology underneath the indenter and its variation with annealing time was examined by employing the bonded interface technique.

Journal ArticleDOI
TL;DR: In this article, a new aspect of the behavior was examined by making nanoindentations on (1.0, 0) single crystals using a series of triangular pyramidal indenters with centerline-to-face angles varying from 35.3° to 85.0°.

Journal ArticleDOI
TL;DR: In this paper, the Schmid factor ratio of prismatic to basal slip at room temperature was found to be 1.5-2.0, which is equivalent to the critical resolved shear stress ratio (CRSR).