Materials Literature
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An ultra high resolution scanning electron microscope, which is composed of a cold cathode field emission gun and an in-lens system for specimens, has been developed. Probe size is estimated 0.8nm at 30kV by calculation and confirmed experimentally using high atomic number samples such as fine Pt particles sputter-coa…
This paper presents an overview of factors affecting irradiation growth of zirconium alloys. Recent data obtained from irradiation programs in EBR-II, ATR, and NRU reactors are used to illustrate the effects of various microstructural and experimental factors on the growth of Zircaloy, zirconium, and zirconium-niobium…
The effects of alloy chemistry and thermal processing on corrosion performance of Zircaloy are shown to provide significant insights into the mechanisms governing nodular corrosion formation. Nucleation and growth behavior of nodular oxide in ex-reactor and in-reactor tests were studied phenomenologically, with the re…
Le courant en fonction du potentiel et l'impedance d'une electrode a disque de cuivre dans une solution d'acide sulfurique et de sulfate de cuivre ont ete etudies en presence de diverses fractions moleculaires de polyethylene glycol (PEG). Les resultats suggerent que PEG forme une barriere adsorbee au depot de cuivre.…
Description Twenty papers will aid investigators conducting failure analysis of advanced composite and metallic materials. Composites papers focus on failure of continuous fiber graphite/epoxy material systems, covering delamination propagation, the effects of impact and radiation damage, and the fracture surface char…
The green mixed-valence dimer [L2Mn2(µ-O)2(µ-MeCO2)][BPh4]2·MeCN (L = 1,4,7-triacacyclononane) is formed on hydrolysis of [L2Mn2(µ-O)(µ-MeCO2)2]2+ in water in the presence of air; characterization by X-ray crystallography showed the presence of the di-µ-acetato-dimanganese(III,IV) core, and temperature dependent magne…
Zirconium alloys are susceptible to a mechanism for crack initiation and propagation called delayed hydride cracking. From a review of component failures and experimental results, we have developed the requirements for preventing this cracking. The important parameters for cracking are hydrogen concentration, flaws, a…
Evaluations of pure beryllium, plus 72 binary beryllium alloys. Bibliography through 1986. Required reference sources for engineers and scientists alike, each volume in the Phase Diagram Monograph Series presents the most complete, authoritative, and reliable phase equilibria information ever published on the alloys.…
Ultrasonic irradiation increases the rates of intercalation (by as much as 200-fold) of organic and organometallic compounds into various layered inorganic oxide and sulphide host solids.
Abstract Samples of the <2‐µm fractions of five pure smectites and six soil clays were reduced by sodium dithionite in the presence of a potassium citrate‐bicarbonate buffer. Subsequently, they were freed of excess electrolyte by dialyzing them in a deoxygenated, 10 −3 M KCl solution. Subsamples of the resulting cl…
Abstract
The crystal and molecular structure of [Cu2(terpy)2Cl2][PF6]2(terpy = 2,2′:6′,2″-terpyridyl) has been determined from three-dimensional X-ray data. The complex crystallizes in the monoclinic space group P21/a with two dimeric formula units in a unit cell of dimensions a= 20.420(8), b= 13.383(1), c= 6.316 5(7)Å, and β=…
A variety of chiral esters of a range 4-n-alkanoyloxybiphenyl-4′-carboxylic acids have been prepared in order to produce three closely related homologous series of liquid-crystalline materials. The majority of the materials synthesized were found to exhibit smectic liquid-crystalline phases close to room temperature.…
Simple formulations are described for evaluating overall anisotropy of the kind sometimes found in diffraction from crystals of macromolecules. The models correspond to whole-body anisotropic vibration of unit cells or of asymmetric macromolecular units that internally also undergo local isotropic atomic motions. Thes…
Several authors have proposed methods which use the Taylor–Bishop–Hill theory in order to calculate the yield surface of textured samples of which the O.D.F. is known. The purpose of this paper is to show how these methods can be generalized while keeping the computational effort within reasonable limits. It must be e…
Abstract not Available.
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Po‐zen Wong; Fractal surfaces in porous media. AIP Conf. Proc. 25 March 1987; 154 (1): 304–317. h…
Abstract In spite of the wide availability of automated diffractometers and advanced data reduction software, numerous traditional problems still exist that make highly precise and accurate quantitative analyses of complex mixtures difficult. The problems include particle statistics, primary extinction, microabsorptio…
Al13 Fe4 tenfold twins, found in rapidly cooled Al–Fe alloys, have been studied by transmission electron microscopy. The development of the tenfold diffraction pattern from the twins is clearly shown, and compared to the tenfold pattern of the decagonal phase found in the same specimen. The coexistence of the tenfold…
In our previous developmental study on skin we reported that correlations existed between the collagen fibril diameter distribution, glycosaminoglycan content and composition, and mechanical role. In this work we present new but related electron microscope data on the ultrastructure of skins from flounder, marlin, cod…