Materials Literature
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When a binary alloy is directionally solidified, a two-phase mushy dendritic zone is often formed. Interdendritic convection of the melt may occur, and is coupled with compositional convection of the residual melt. If fluid flow velocities are high enough, local melt-back of the dendrites may occur, leading to channel…
Abstract Thin-section and X-ray diffraction analyses of 31 outcrop samples show that the early diagenesis of heterogeneous volcaniclastic and arkosic sandstone and conglomerate of the Middle Park Formation (Upper Cretaceous- Paleocene) was strongly influenced by detrital mineralogy. Rocks with abundant andesitic rock…
We have investigated visible photoluminescence excited by Ar ion laser (488 nm, 2.54 eV) at room temperature from Si+-implanted thermal oxide films grown on crystalline Si wafer, as-implanted and after subsequent annealing in vacuum. We found two types of visible luminescence bands similar to those of silica glasses;…
Research has been undertaken on the microstructure, mechanical properties, and impact abrasion resistance of high manganese steels containing primary or eutectic NbC particles. The present paper presents and analyses test results on the impact deformation resistance (determined using a drop weight device) and work har…
Article The Effect of Grain Size and Prestrain on the Superplastic Behavior of a 7475 Aluminum Alloy was published on October 1, 1994 in the journal International Journal of Materials Research (volume 85, issue 10).
After summarizing essential features of antiferroelectric liquid crystals (AFLCs), recent progress in the application of AFLC for displays and spatial light modulators is presented. These devices are based on the electricfield-induced antiferroelectric-ferroelectric phase transition characterized by sharp threshold an…
The paper presents beryllium extraction process being operated at the beryllium pilot plant of Bhabha Atomic Research Centre. The metal is produced by magnesium reduction of anhydrous beryllium fluoride. Reduction process yields beryllium metal in the form of pebbles. Metal pebbles are refined by vacuum induction melt…
This article discusses the dissolution of mineral fibers in simulated physiological fluids (SPF), and the parameters that affect the solubility measure- ment in a dynamic test where an SPF runs through a cell containing fibers (Scholze and Conradt test).Solutions simulate either the extracellular fluid (pH 7.6) or the…
An x-ray photoelectron spectroscopy (XPS) analysis was performed of polypyrroles (PPy) electrosynthesized on Pt in aqueous solution. Spectra were recorded both for the as-synthesized (pristine) polymer (specimen 1) and for the so-called “overoxidized” PPy (specimen 2). Electrosynthesis was accomplished potentiostatica…
The fracture strengths of sintered Al 2 O 3 containing 20 and 40 vol% ZrO 2 (12 mol% CeO 2 )—zirconia‐toughened alumina (ZTA)—composites along with the fracture resistance can be increased (e.g., to ∼900 MPa and >12 Mpa·m 1/2 , respectively), by increasing the mean grain size of the t ‐ZrO 2 (and the Al 2 O 3 ) from ∼…
Abstract Irradiation of visible light on a dichloromethane or chloroform solution in the presence of halogenated p-benzoquinones, such as fluoranil, chloranil, and bromanil, caused the formation of an acid, HCl. In the presence of octaethylporphyrin in those solutions, the photoinduced protonations of porphyrins were…
Styrene butadiene rubber formulations utilizing Egyptian Kaolin as a filler, were evaluated against a commercial imported Kaolin sample.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysical Processes in Aromatic Polyimides. 2. Photoreduction of Benzophenone-containing Polyimide Model CompoundsMasatoshi Hasegawa, Yoichi Sonobe, Yoichi Shindo, Tokuko Sugimura, Takashi Karatsu, and Akihide KitamuraCite this: J. Phys. Chem. 1994, 98, 42, 10771–10778Pu…
TGS crystals with different levels of phosphate doping are grown and ultrasonic studies have been caried out on them. No significant variation in the absolute velocity values have been observed in TGS on phosphate doping; but the temperature dependence of velocity in the critical region shows marked deviations. The sh…
J-integral fracture mechanics techniques and electron microscopy observations were used to investigate the effects of tritium and its radioactive decay product, {sup 3}He, on Types 316L, 304L and 21Cr-6Ni-9Mn stainless steels. Tritium-exposed-and-aged steels had lower fracture-toughness values and shallower sloped cra…
The effect of adding salts NH4OH and CsOH to aqueous solutions of NH4PFO and CsPFO, respectively, was studied for concentrations in the range 0 to 2 wt %. In both systems, the isotropic to nematic and nematic to lamellar phase transition temperatures were elevated. There was an insignificant effect on the width of the…
Raman spectra of KH2PO4 (KDP) under uniaxial pressure were studied at various temperatures around the transition point from the paraelectric to the ferroelectric phases. For pressures along the [110] direction in the paraelectric phase, and along the [100] direction in the ferroelectric phase, many qualitative modific…
The initiation and growth of cracks in type 316L (UNS S31603) stainless steel (SS) in a chloride solution containing thiosulfate ions (S2O32−) during slow strain rate testing (SSRT) were analyzed on the basis of fracture mechanics. Crack behavior on the specimen surface was observed in situ using a charge-coupled devi…
An α-cyanostilbene crystal showing optical nonlinearity was examined to be compared with a non-optically active crystal, with emphasis on the structural aspect. It was suggested that the introduction of bulky substituents such dimethylamino and methoxy groups into the cyanostyrene conjugation system was effective to g…
The influence of Nd 2 O 3 doping on the reaction process and sintering behavior of BaCeO 3 is investigated. Formation of BaCeO 3 is initiated at 800°C and completed at 1000°C. When Nd 2 O 3 is added to the starting materials, the formation of BaCe 1–x Nd x O 3–δ is delayed and the temperature for complete reaction is…