Showing papers in "Scripta Materialia in 2006"

TL;DR: In this article, the potential of metallic glasses as structural materials is assessed and a wide-ranging comparison with conventional engineering materials shows metallic glasses to be restricted to niche applications, but with outstanding properties awaiting wider application, for example in micro electro-mechanical systems devices.

TL;DR: An analytical model for predicting the yield strength of particulate-reinforced metal matrix nanocomposites has been developed in this article, where the strengthening effects involving Orowan strengthening effect, enhanced dislocation density due to the residual plastic strain caused by the difference in the coefficients of thermal expansion between the matrix and particles, and loadbearing effect have been taken into account in the model.

TL;DR: In this paper, a general correlation between the phase stability and the elastic properties in β(body-centered cubic)-type Ti-alloys is investigated with the aid of two electronic parameters.

TL;DR: The measured hardness of nanocrystalline Cu with grain sizes as small as 10 nm still follows the Hall-Petch relation as discussed by the authors, suggesting grain boundary activities are enhanced but not yet dominant in the plastic deformation.

TL;DR: In this paper, the effect of a nanocrystalline surface layer on the fatigue behavior of a 316L stainless steel is investigated, and significant enhancements of the yield stress and the fatigue limit have been achieved through surface mechanical attrition treatment (SMAT).

TL;DR: These simulations suggest guidelines for the development of accurate micro-compression experiments in terms of fillet to post radius ratio, post aspect ratios, post taper, and system alignment.

TL;DR: In this paper, the interaction between screw dislocations and coherent twin boundaries has been studied by means of molecular dynamics simulations for Al, Cu and Ni, and it was shown that screw dislocation approaching the coherent twin boundary from one side may either propagate into the adjacent twin grain by cutting through the boundary or it may dissociate within the boundary plane.

TL;DR: Friction stir processing (FSP) has been applied to incorporate 5-10 vol.% nano-sized SiO2 into an AZ61Mg alloy matrix to form bulk composites as mentioned in this paper.

TL;DR: In this paper, a high-pressure modification of the field activated sintering (SPP) was used to obtain densities approaching 10nm for both zirconia and ceria.

TL;DR: In this article, the effect of deformation twinning on the strain hardening behavior of polycrystalline AM30 Mg alloy was investigated, and the softening effect induced by double and contraction twinning was responsible for the abnormal strain-hardening behavior.

TL;DR: In this article, a bulk nanocrystalline Al-5%Mg alloy was synthesized by an in situ consolidation mechanical alloying technique, which has four times the strength of a conventional Al-5083 alloy along with good ductility (8.5% elongation).

TL;DR: In this paper, a model for the low temperature tensile response of copper polycrystals with grain sizes in the range of 2-50μm was proposed and the initial work hardening behavior was strongly grain size dependent and was considered to arise from a combination of kinematic and isotropic hardening due to dislocation-grain boundary interactions.

TL;DR: In this paper, dual beam focused ion beam-scanning electron microscopes are used for characterizing micron and sub-micron size microstructural features in three dimensions via serial-sectioning procedures.

TL;DR: In this paper, the effect of Zn addition on the age hardening response of Mg-Sn alloys has been investigated and the peak hardness increased substantially from 60 HV to 80 HV with the addition of 0.5% Zn.

TL;DR: In this paper, a hot-extruded 18R-type long period ordered (LPO) Mg97Y2Cu1 alloy was used to obtain high tensile mechanical properties.

TL;DR: In this article, the relationship between texture distribution and tensile behavior of a FSP AZ31B Mg alloy is discussed, where the texture distribution is associated with the tensile properties of the alloy.

TL;DR: The reaction layers of friction stir welded joints made from austenitic stainless steel and Al alloy consisted of mixed layers of elongated and ultra-fine grains and the intermetallic compound layer as discussed by the authors.

TL;DR: In this paper, the potentialities of dislocation dynamics simulations for performing analyses of crystal plasticity and obtaining information that cannot be reached by experiment are emphasized, such as the mesoscopic coefficients of interaction between non-coplanar slip systems.

TL;DR: In this article, the authors investigated the reaction of arc-evaporated cubic Al0.7Cr0.3N hard coatings in Ar up to 1450 °C.

TL;DR: In this paper, the activation of different slip and twinning systems were investigated in rolled Mg-3Al-1Zn using electron back scattering diffraction analysis was performed on deformed surfaces and on metallographically prepared cross-sections following deformation at room temperature.

TL;DR: In this article, the size/microstructure of the nanoparticles are characterized by X-ray diffraction and transmission electron microscopy, and the thermal conductivity of the nanofluid is measured using a modified thermal comparator.

TL;DR: In this paper, the precipitation sequence on artificial ageing of a stretched Al-Cu-Mg alloy was studied using transmission electron microscopy, differential scanning calorimetry and hardness tests, which showed that the second stage hardening is dominated by S phase, which forms a dense precipitate structure at the peak hardness stage, whilst no significant amounts of other phases or zones are detected.

TL;DR: In this article, the precipitation of nanostructured ω and α phases by heating a metastable Ti-based alloy was observed by high-resolution transmission electron microscopy.

TL;DR: In this paper, the eutectic silicon in A356 alloy can be refined and modified using either chemical, quench, or superheating modification using high-intensity ultrasonic vibration.

TL;DR: In this paper, the free volume approach to the temperature dependence of the liquid viscosity, structural relaxation, and deformation-induced softening of the glass is reviewed and assessed based on the results of recent creep data on a bulk metallic glass.

TL;DR: The electron backscatter diffraction technique and Schmid factor analysis revealed that deformation twinning was influenced both by grain rotation due to slip and by the Schmid Factor as discussed by the authors.

TL;DR: In this article, the deformation textures of extruded AM30 magnesium alloy tubes deformed along different directions show clear evidence that extension twinning is responsible for the texture changes and that its activation is dictated by the Schmid factors applicable to different twinning planes.

TL;DR: In this paper, the tensile behavior of ultra-fine grain (UFG) pure Ti fabricated by equal channel angular pressing was investigated at ambient temperature, and the dislocation-based model was used to discuss the properties of UFG pure Ti.

TL;DR: In this article, the microstructure and mechanical properties of a precipitation hardening Al-Cu (2219) alloy subjected to cryorolling, low temperature annealing and ageing treatments are reported.

TL;DR: In this article, metal powder compacts were sintered using single mode microwave radiation, and the results of microwave sintering were compared with those of conventional Sintering.