Showing papers in "Scripta Materialia in 2007"

TL;DR: In this paper, it was shown that the sample size effect can be rationalized almost completely by considering the stochastic of dislocation source lengths in samples of finite size, and the statistical first and second moments of the effective source length were derived as a function of sample size.

TL;DR: In this paper, the authors summarized the recent developments concerning sorption properties and thermodynamics of Mg-based hydrides for hydrogen storage applications in particular, promising strategies to decrease the hydrogen reaction enthalpy by alloying and the use of reactive hydride composites are discussed.

TL;DR: The work hardening properties of a friction stir welded (FSWed) magnesium alloy were evaluated using two modified equations of hardening capacity and strain hardening exponent where the elastic deformation stage was excluded.

TL;DR: In this paper, the authors describe approaches for modifying the thermodynamics and kinetics of hydrogen sorption reactions in light-metal hydrides using additives that form new compounds during dehydrogenation.

TL;DR: In this paper, a Mg-8 ¾wt.% Zn alloy, aged isothermally at 200°C, was characterized using transmission electron microscopy and electron microdiffraction, and it was found to have a monoclinic structure similar to that of Mg4Zn7.

TL;DR: In this paper, NiFe2O4 nanoparticles were synthesized by a simple and cost-effective method using Ni and Fe nitrates and freshly extracted egg white (ovalbumin) in an aqueous medium.

TL;DR: The tetrahydroborates represent a class of complex hydrides with the largest gravimetric and volumetric hydrogen density for hydrogen as discussed by the authors, and they are potential hydrogen storage materials for mobile applications.

TL;DR: In this article, the microscopic strain distribution of a dual phase steel at the grain scale was measured using digital image correlation based on scanning electron microscopy topography images at large strains, and the results showed how strain is partitioned between the ferritic and martensitic regions.

TL;DR: In this article, single-crystal micro-pillars of a molybdenum alloy were prepared by a new technique that involves chemically etching away the matrix of a directionally solidified NiAl-Mo eutectic.

TL;DR: The relationship between water droplet size and surface geometric parameters governs the transition from composite solid-air liquid interface to homogeneous solid-liquid interface on superhydrophobic surfaces as mentioned in this paper.

TL;DR: In this article, the mean hardness of the UFG region reaches ∼120Hv, which is more than twice as high as that of the AZ31 matrix, and the grain refinement kinetics are analyzed and the results are self-consistent.

TL;DR: In this paper, a Mg-Al-Zn casting was subjected to friction stir processing (FSP) and subsequent aging, which resulted in significant breakup and dissolution of the coarse, network-like eutectic β-Mg17Al12 phase distributed at the grain boundaries and remarkable grain refinement, thereby improving significantly the tensile properties of the casting.

TL;DR: In this paper, a high carbon steel joint was successfully friction stir welded without any pre- or post-heat treatment, and it was proved that friction stir welding enables us to properly control the cooling rate and peak temperature, which was impossible using traditional welding.

TL;DR: In this paper, it was shown that a low heating rate has an effect on the densification and transparency of alumina for sintering at 1150°C with a heating rate of 8°C/min.

TL;DR: In this article, the evolution of thermal conductivity and the coefficient of thermal expansion as a function of the alloying content of boron and chromium in the copper matrix in Cu-X/diamond composites is presented.

TL;DR: In this article, the authors performed in situ synchrotron X-ray diffraction experiments on low-alloyed multiphase TRIP steels during cooling, to monitor the martensitic transformation of individual austenite grains within the bulk material.

TL;DR: In this article, the high-temperature strength of new cobalt-base alloys reinforced with a high volume fraction of a Co3(Al, W) ternary L12 intermetallic compound has been examined.

TL;DR: In this article, the production of titanium foams using magnesium powders as spacer particles has been investigated and the resultant yield strength and elastic moduli values were observed to vary in the range 15-116 MPa and 0.42-8.8 GPa, respectively.

TL;DR: In this article, the use and limitations of physisorption as a storage technology for hydrogen are discussed, and the use of high surface area activated carbons (AC), single-walled carbon nanotubes (SWNTs) and metal-organic frameworks (MOFs) have been proposed as storage media for hydrogen.

TL;DR: In this paper, the effect of Zr on β-phase stability was investigated in β-type Ti-Zr-Nb alloys and the β/βω(+α) phase boundary was determined experimentally in the alloys at several Zr content levels.

TL;DR: In this article, the authors applied a high ratio of the circumferential velocities between the upper and lower rolls in asymmetrical rolling, achieving a very fine grain size of 1.4μm.

TL;DR: In this paper, the fracture paths correspond with the lowest hardness distribution profiles in the joints, and the heat indexes cannot be used as parameters to evaluate the thermal input, mechanical properties and fracture mode.

TL;DR: In this paper, the effect of heating mode on the microstructure and mechanical properties of 92.5W 6.4Ni 1.1Fe alloy was compared with a conventional furnace and a 2.45 GHz microwave furnace.

TL;DR: In this article, the effect of the data correction on the constitutive behaviour, incorporating a strain-dependent parameter, of wrought magnesium alloy Mg-Al4-Zn1 was evaluated.

TL;DR: A new class of oxyhalide photocatalysts, xBiOI−(1−−x)BiOCl, were prepared by a soft chemical method in this paper.

TL;DR: In this article, the effect of ball milling and Ti-based additives on the dehydriding properties of well-crystallized Mg(BH 4 ) 2 was investigated.

TL;DR: In this article, the defect-free pure copper welds were achieved under low heat input conditions of 400-800rpm for a traverse speed of 50mm min−1, where the grain size of the nugget zones decreased from 9 to 3.5μm.

TL;DR: In this article, the banding in a friction stir weld was determined to correspond to a periodic textural variation between the B / B ¯ component and a mixture of B/ B ¯ and C components of the simple shear texture.

TL;DR: In this article, the dielectric and conductive properties of polypropylene (PP)/multiwalled carbon nanotube (MWNT) nanocomposites were examined.

TL;DR: In this paper, the authors assessed the thermal conductivity of composites in the range of intermediate effective phase contrast against experimental values on diamond particle-reinforced Ag-11 at.%Si composites.