Materials Literature
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Fission cross section ratios of 240Pu and 242Pu relative to 235U were measured by using the 4.5 MV Dynamitron accelerator of Tohoku University. The measurement using mono-energetic neutrons was performed in the neutron energy range of 0.6–7 MeV with the time-of-flight method. Prior to the measurement, a fast timing ba…
The diffusivities of O2 molecules in amorphous SiO2 thin films were determined over the temperature range of 1073 to 1273 K by means of the thermal oxidation of Si substrates. The SiO2 films were synthesized on Si substrates with the four different methods, i.e., thermal oxidation, sputtering, chemical vapor depositio…
Alumina short fiber and carbon short fiber reinforced aluminum composites were fabricated by squeeze casting. Tensile and sliding tests and metallography of the composites were carried out. It was revealed that hybrid fiber composites of alumina and carbon fibers had good sliding properties, especially under dry condi…
We have proposed a general formula of electron inelastic mean free path (IMFP) to describe the calculated IMFPs over the 50-2000 eV energy range based on the Inokuti's modified Bethe formula for the inelastic scattering cross sec-tion. The IMFPs for 50-2000 eV electrons in 27 elements were calculated using Penn's algo…
This paper deals with the formation of grain boundaries during plastic deformation of pure magnesium, a matrix type magnesium alloy (Mg-6Zn-0.65Zr), and the two-phase Mg-8.1Li-4.2Al alloy. It is shown that the main process responsible for the generation of recrystallized grains is the formation of subgrains under smal…
The triply incommensurate phase in 2H–TaSe2, which exists between 112 and about 85 K on cooling, has been investigated by means of electron microscopy. The high resolution micrographs clearly show that the incommensurate phase between 112 and 92 K is an intrinsic incommensurate phase without orthorhombic domains of th…
In the past ten to fifteen years, considerable research has been conducted on the use of both organic and inorganic fibrous catalyst supports. Much work has been done recently on the immobilization of enzymes by porous solid fibers and by hollow fibers. Fibrous supports have the advantage over conventional supports su…
Over 120 organic compounds have been investigated as potential corrosion inhibitors for mild steel in simulated engine coolants. A relationship has been found between the corrosion potential (Ecorr) and inhibitor performance (Rp). With straight chain alkyl carboxylates, maximum inhibition was found for C6- C10 monocar…
It is pointed out that the magnetic material for cores of a differential current transformer (DCT) of a ground fault interrupter (GFI) should be characterized by high initial permeability, little dependence on temperature, and a low remanence. These parameters have been taken into consideration during selection of the…
A low temperature dyeing technique that was developed as a characterization method for poly(ethylene terephthalate) (PET) partially oriented yarns revealed thermally activated interactions between the fibers and spin finishes containing pure or close derivatives of poly(ethylene glycol) (PEG) that bring about dye bloc…
Abstract Extender oil bloomed on the surface of ethylene–propylene–diene rubber (EPDM) vulcanizates has been analyzed by a dissolution/size exclusion chromatographic (SEC) method. Dissolution is here defined as the quantitative and selective removal of bloomed extender oil from the vulcanizates. The rate of migration…
This paper summarizes the results of an investigation conducted to characterize tensile and shear response of P100/6061 graphite-aluminum composite in the temperature range -101 to 260°C (-150 to 500°F). The off-axis tension test and losipescu shear test methods were employed to meet this objective. The experimental r…
There is still some debate on the extent of plasticity of oxide scales at high temperatures. Examination of scales after creep of the substrate often shows that at higher strain rates scale cracks are visible after only very low strains (brittle behaviour), whereas at low strain rates no scale cracks are observed afte…
The effect of strain, strain rate and temperature on phase size and its subsequent growth during superplastic deformation has been studied for Ni modified Ti–6Al–4V. Experimental results suggest that these parameters strongly influence the effective dynamic phase size change for both phases and particularly for the be…
SummaryThe role of the hopeite and phosphophyllite phosphate coating ratios in determining the corrosion resistance of mild steel when coated with cathodic electroprimer and paint are reviewed and discussed. Attention is drawn to the problems associated with adequately defining the ratio, its calculation and broader r…
The compositional effect on magnetic properties of Co–Fe–Si–B amorphous alloys was examined with the aim of finding an optimum composition for a magnetic head material. The lowest coercivity (Hc) and the highest permeability at 0.3 kHz (μ0.3) in the as-quenched state were obtained at 0.94Co/(Co+Fe) and in the metalloi…
Electron microscopic studies of as-cast Sm(Co,Fe,Cu,Zr)/sub 9/ magnets revealed a hexagonal phase of the type Sm/sub 2/(Co,Fe,Cu,Zr)/sub 17/ with crystal lattice parameters of a=0.84 nm and c=3.2 nm. After a solid solution treatment, only rhombohedral (3R) and hexagonal (2H) grains were found. After an additional anne…
Joint of alumina ceramics (98.1% Al2O3) to copper was made using Cu-(10-50wt%)Ti-(5wt%)Co brazing filler metals. The Cu-30wt%Ti-5wt%Co brazing achieved the highest shear strength 195 MPa at room temperature.The composition and structure of the ceramic-metal bond zone in the Al2O3-Cu joints were analyzed by SEM, EPMA a…
The effect of profile imperfections, like axial index dip and layered structure in the inner cladding, on the leakage loss of LP01 mode in MCVD made single-mode DIC fibres is investigated quantitatively through a Matrix approach. The study reveals that these apparent profile imperfections may greatly affect leakage lo…
A study is reported of the effect on the mechanical properties of cotton fibres treated with liquid ammonia before application of dimethyloldihydroxyethyleneurea (DMDHEU). The properties are compared with those of the same cotton mercerized and then treated with DMDHEU. It appears from density determinations that the…