Showing papers in "Scripta Materialia in 2005"

TL;DR: In this article, three major mechanisms involved in CNT/Al composites are analyzed along with experimental procedure for making CNT and Al composites, along with three major composites strengthening mechanisms.

TL;DR: In this article, an electrodeposited Cu sample with a high density of nano-scale growth twins showed an ultrahigh tensile strength (similar to 1 GPa) with a considerable plastic strain (> 13%).

TL;DR: In this paper, the authors showed that adding 1.2 × 2 Zn to this alloy significantly enhanced the age hardening response and the creep strength and the remarkable improvement in strength and creep resistance is associated with a uniform and dense distribution of basal precipitate plates that are not observed in the Zn-free alloy.

TL;DR: In this article, a 14H-type long period ordered (LPO) structure from a supersaturated α-Mg matrix in Mg-Zn-Gd alloys was presented.

TL;DR: In this article, a nanocrystalline 316L austenitic stainless steel sample (mean grain size similar to 40 nm) was prepared by means of surface mechanical attrition treatment, which exhibited an extremely high yield strength up to 1450 MPa, which still follows the Hall-Petch relation extrapolated from the coarse-grained material.

TL;DR: In this article, a correction method for the Nix/Gao model of the indentation size effect is proposed, assuming that the geometrically necessary dislocations are stored within the plastically deformed volume, whose radius is given, depending on the material, by a factor times the contact radius.

TL;DR: In this paper, a formulation of the Gibbs-Thomson equation is proposed and different approximation solutions of this equation found in the literature are discussed, based on simple thermodynamics considerations, and different approximations are discussed.

TL;DR: The grain size of as-cast Ti-6Al-4V was reduced by about an order of magnitude from 1700 to 200μm with an addition of 0.1% boron as mentioned in this paper.

TL;DR: In this article, the strain rate sensitivity of commercial purity aluminium (Al 99.5) with conventional and ultrafine (UFG) grain size was investigated by compression tests at different temperatures.

TL;DR: In this article, friction stir processing (FSP) was used to refine the grain size in commercial 7075 Al to a sub-micrometer scale (∼250 nm) and the resulting microstructural characteristics were studied.

TL;DR: In this article, a silicon carbide coating has been produced by a two-step pack cementation technique to protect carbon/carbon (C/C) composites from oxidation.

TL;DR: In this article, two-directional microwave assisted rapid sintering was carried out to sinter different metal-based materials, and tensile testing of microwave synthesized materials revealed superior mechanical properties compared to conventionally sintered materials.

TL;DR: In this article, a novel process to fabricate carbon nanotube (CNT)/alumina nanocomposites, consisting of a molecular level mixing process and an in situ spark plasma sintering process, is proposed.

TL;DR: In this article, surfaces of A319 and A356 castings were treated by friction stir processing to reduce porosity and to create more uniform distributions of second-phase particles, which increased the ultimate tensile strengths, ductilities, and fatigue lives of both alloys.

TL;DR: In this article, the as-cast three-dimensional morphologies of alpha-Al-15(Fe,Mn)(3)Si-2 and beta-Al5FeSi intermetallics were investigated by serial sectioning.

TL;DR: In this article, a sol-gel combustion synthesis was used to produce nano-crystalline particles of barium hexaferrite, and the results revealed that the nitrate citrate gels exhibit a self-propagating behavior after ignition.

TL;DR: In this article, the friction stir welding of AZ31Mg/1060Al was investigated and the welds were formed when the stirring pin was off the centerline to AZ31 or to 1060, and were characterized by intercalation lamellae.

TL;DR: In this paper, the work hardening rate of various ultrafine grained steels with different carbon contents was studied, and the increase in the amount of finely dispersed cementite particles leads to an improved workhardening rate, which is sufficiently large to balance the negative effect of grain refinement on ductility.

TL;DR: An unusual precipitate structure in ternary Al(Sc,Zr) alloys has been revealed by analytical and high-resolution transmission electron microscopy as mentioned in this paper, where a core containing Al and Sc surrounded by a Zr-rich shell was found.

TL;DR: In this paper, the nano-twinned bulk Cu specimens with a high density of nano-scale mechanical twins were produced by means of dynamic plastic deformation at liquid nitrogen temperature.

TL;DR: In this paper, the microstructure and texture development during hydrostatic extrusion of magnesium alloy AZ31 was investigated. And the influence of the process parameters used, such as the extrusion temperature in the range 225-300°C as well as the different cooling conditions after extrusion, was discussed.

TL;DR: In this article, a tri-modal composite with 10 wt.% B4C, 50 wt% coarse-grained 5083 Al and the balance nanocrystalline 5083Al was fabricated, using cryomilling and compaction.

TL;DR: In this paper, the chemical inhomogeneity in bulk metallic glass was investigated using a three-dimensional atom probe to understand the enhanced plasticity under compressive mode observed in an injection-cast alloy.

TL;DR: In this paper, the micro-structure and performance of Ni-ZrO2 composite nano-coating was characterized by environmental scanning electron microscopy, and the hardness and wear performance of the coatings were also investigated.

TL;DR: In this article, an EDS analysis yielded an interdiffusivity value of 1.9μm2/s, attributed to high strain rate (∼103−s−1) plastic deformation in aluminum, which may increase the instantaneous vacancy concentration as high as ∼10−1.

TL;DR: In this article, Nanocrystalline (Ti,W)C-Ni powders were synthesized from oxides and sintered at 1510°C for 1.h.

TL;DR: In this article, the development of new nanostructured MgH2 composites in which fluorine and TM catalysts are introduced through the addition of TM fluorides such as FeF3.

TL;DR: In this article, the precipitation process of an Mg-0.3Ca-Zn alloy has been investigated by transmission electron microscopy and the chemical compositions of the precipitates have been characterized by a three-dimensional atom probe.

TL;DR: Inconel 738 on directionally solidified (DS) Ni-based superalloy demonstrates a strong susceptibility to cracking as mentioned in this paper, and cracks originate from the liquation of low melting point eutectic on the DS grain boundary.

TL;DR: In this paper, the effects of ultrasonication and UV/ozone treatment of graphite on electrical conductivity of epoxy-based nanocomposites containing graphite nanoplatelets are investigated.