Materials Literature
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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…
Abstract This article discusses the compositions, properties, and typical applications for ductile irons that are defined by U.S. and international standards . It describes the various methods used to test and inspect the metallurgical control processes in ductile iron production. The article discusses the effect of c…
Humidity-induced movements were studied on biaxially stretched samples of sized and gessoed fabric and on films of size and gesso without fabric. In-plane strains were detected through observation of crack patterns formed in a brittle coating applied on the samples. Different patterns recorded during drying and humidi…
The electrochemical behaviour of iron in methanol solutions has been investigated. In anhydrous methanol (<0.07%H2O), iron dose not exhibit definite passive behaviour. In the presence of water up to 5.0% content there is a decrease in anodic dissolution current and the passive behaviour is clearly observed. On the oth…
Ultrafine powders of β-SiC containing 15wt% free Si, which were produced by the gas evaporation method, were pres surelessly sintered. The behavior of SiC crystal growth during the sintering was observed by scanning electron microscopy (SEM). When the sintering was carried out under the condition that the upper side o…
The weight loss behavior of commercial polyglycerols (PG) and PG with various degrees of polymerization, and polyglycerol fatty acid ester (PGFE) with various carbon numbers of acyl group and various degrees of esterification was studied by means of dynamic programmed thermogravimetry (TG). The relationship between th…
A brief discussion of the nature and design of polymer-modified microsurfacing materials is followed by a study comparing the resilient modulus of field cores from a rut-filling project with laboratory-generated cores of a similar nature. Resilient modulus testing was performed at temperatures ranging from -30 to 100°…
Predicted intrinsic dissolution rates were obtained under unbuffered conditions for ionizable and unionizable drugs employing a simple approach based on the diffusion layer theory. These rates correlated well with experimentally determined values for Cromakalim, Diproteverine HC1 and Ephedrine thereby substantiating t…
Thermolysis of N-t-butyl- and N-cumyl-2,2-dichlorocyclopropylimines gives selectively 3-chloropyrroles in polar solvents and 2-chloro derivatives with added base.
The effect of carbon, phosphorus and nitrogen content on the surface roughness and cutting force was studied with regard to the microstructure of specimen and the behavior of void formation and built-up edge during cutting. Specimens to plunge-cutting were prepared by adding each element into pure iron.Two-phase micro…
Powders of the Al–Li and Al–Li–Fe alloys were produced by a centrifugal atomizing method, and the main structural characteristics of the powder particles were studied. We present a detailed description of the atomizing method, which was found to produce an appropriated distribution in size of the powder particles, for…
Selective pitting studies were used to determine environments likely to cause stress corrosion cracking (SCC) in Alloy 400. Slow strain rate tests were performed on waisted specimens, with solution composition and concentration, strain rate, grain size, and prior cold work as variables. It was found that environments…
The papers in this volume give a comprehensive review of the mechanical behaviour of new electromagnetic materials and their applications and discuss in detail their present and future roles. Containing contributions by outstanding experts the volume will be essential reading for all those involved in the areas of sup…