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Fast neutron irradiation to total fluences ranging from 7.7 × 1021 to 5.7 × 1022 n/cm2 (3 to 16 dpa) resulted in a 65% increase in yield strength and a fourfold reduction in ductility. Intergranular fracture was the dominant failure mode for the irradiated material, whereas equal amounts of intergranular and trans-gra…
Abstract Glass transition temperatures have been determined for polystyrenes crosslinked with 1–10% divinylbenzene and swollen with toluene, chloroform, N , N ‐dimethylformamide, and tetrahydrofuran to as high as 0.7 weight fraction solvent. The T g ′s depend approximately on the weight fractions and the T g ′s of the…
The occurrence and ecology of two poorly known planktonic diatoms, Melosira distans var. tenella (Nyg.) M.‐B. Florin and Eunotia zasuminensis (Cabejsz.) Körner in central Finland is discussed. Both species have their maximum in late summer when water temperature is > 15°C and they prefer slightly acid water (pH <…
Densities >99% of theoretical were obtained with stabilized ZrO2 additions to Si3N4. Material sintered at 2140°C under 2.5 MPa nitrogen overpressure with 3.8, 9.9, and 13.4 wt% ZrO2 had a predominantly equiaxed grain size ranging from 0.2 to 7.0 μm. At 1370°C, the latter composition exhibited a flexural strength of ≅4…
Upon rapid thermal decomposition of GeI2—an important reaction for the chemical transport of germanium—the metastable subiodide Ge4.06I, a semiconductor with a clathrate structure, is formed. The clathrate framework is made up of Ge and I3+, and I− ions are present in the cavities: [Ge46-8/3I8/3]I8·Ge4.06I forms dendr…
The number-average molecular weights (Mn) and weight-average molecular weights (Mw) for proanthocyanidin polymers (condensed tannins) have been measured by vapour pressure osmometry and low-angle laser light-scattering measurements in methanol. These confirm earlier findings (based on gel permeation chromatography of…
The present paper is concerned with the modelling of creep and creep damage in polycrystalline metals and the experimental evaluation of the proposed model. By ascribing the reduction of creep rates caused by the principal stress rotation (i.e., cross-hardening) to the intersection mechanism of dislocations on active…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation of electron-transfer rate constants of carbanions with their oxidation potentials and basicitiesFrederick G. Bordwell and Mark J. BauschCite this: J. Am. Chem. Soc. 1986, 108, 8, 1985–1988Publication Date (Print):April 1, 1986Publication History Published online1…
The pressure dependence of the Raman bands of NaHCOO has been studied at 298 K and three different phases were identified up to pressures of 30 kbar. Phase II is the one stable at ambient conditions, and when heated to 500 K at ambient pressures it undergoes a transition to phase I. This transition has also been studi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA high-temperature fast-flow-reactor kinetics study of the reaction aluminum monoxide + carbon dioxide .fwdarw. aluminum dioxide + carbon monoxide. Thermochemical implicationsDonald F. Rogowski, Andrew J. English, and Arthur FontijnCite this: J. Phys. Chem. 1986, 90, 8, 1688…
Abstract Uniaxial tension tests to the yield point were performed on polyethylene as a function of temperature from 21 to 117°C at a strain rate of 2 min −1 . At 21, 45, and 69°C, measurements were also made at strain rates from 0.02 to 8 min −1 . Yield energy was found to be a linear function of temperature extrapola…
Abstract Segmented polyurethanes obtained by two‐step synthesis were studied by electron microscope on specimens prepared as replicas from the brittle surface of the polymer and on thin sections cut with a cryo‐ultramicrotome. Each of the specimens showed two different kinds of dispersed phase. Information obtained on…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation G. Saha, N. Kurmaih; Technical Note: The Mechanism of Corrosion Inhibition by Phosphate-Based Cooling Syste…
The sulfide stress cracking (SSC) resistance of Ni-containing low-alloy steels was studied using laboratory and commercial heats over the range of 600 to 800 MPa yield strength (700 to 900 MPa tensile strength). The results were interpreted with regard to observations by metallurgical and electrochemical analyses. In…
Treatments in highly polar solvents, such as dimethyl formamide, dimethyl acet amide, and dimethyl sulfoxide, under suitable conditions have been found to improve the dyeability of Nomex® yam so that it can be dyed under atmospheric conditions in a reasonable length of time without the aid of a carrier. Essentially, t…
The decrease in corrosion resistance of 316L stainless steel due to static stress was studied in vitro using a 37 degree C Ringer's solution electrolyte. Both potentiodynamic polarization and coulometric techniques were used. Cyclic anodic polarization tests with highly loaded fracture mechanics samples revealed a low…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of the boron trichloride-catalyzed thermal ring-opening polymerization of hexachlorocyclotriphosphazene in 1,2,4-trichlorobenzene solutionMichael S. Sennett, Gary L. Hagnauer, Robert E. Singler, and Geoffrey DaviesCite this: Macromolecules 1986, 19, 4,…
Fine Si 3 N 4 powders were prepared by the combustion reaction of an Si powder compact undez 10 MPa nitrogen pressure. Addition of Si 3 N 4 powder to the starting Si promoted conversion of the reactants to homogeneous Si 3 N 4 particles. Submicrometer SisN 4 powders with a uniform size distribution around 0.5 μm were…
The amount of electric charge induced on a sample powder surface by contact with another reference powder has been measured by using a blow‐off method. Samples are three binary inorganic compound systems, consisting of 36 oxides, 15 fluorides, or 13 sulfides of various metal elements. Though the blow‐off charge depend…
Sintered α-SiC was examined in both oxidation and hot corrosion with a burner rig at 400 kPa (4 atm) and 1000°C with a flow velocity of 94 m/s (310 ft/s). Oxidation tests for times to 46 h produced virtually no attack, whereas tests with 4 ppm Na produced extensive corrosion in 13.5 h. Thick glassy layers composed pri…