William R. Bitler

On the origin of deformation twinning in electrodeposits and the phenomenon of cross-twinning

On observe des morphologies de macles interessantes avec des intersections de macles multiples dans des echantillons de depots electrolytiques de palladium

Fluxoid pinning by vanadium carbide precipitates in superconducting vanadium

Vanadium carbide precipitates were formed in pure, annealed vanadium foils by the introduction of carbon in the specimens. Thin, disk-shaped precipitates resulted with mean diameters in the range 100–2600 Å and with number densities from 3 × 1015 to 4 × 1017 particles/cm3. The macroscopic, pinning-force density for magnetic fluxoids was measured at temperatures from 2 to 5 K and for magnetic fields from 0 to Hc2(T). Peak pinning-force densities in the range of 3 × 10 to 3 × 106 dyn/cm3 for T=0K were realized in the 30 specimens studied. The pinning force density was found to obey a scaling law for specimens meeting certain requirements with respect to precipitate particle size and number density. These requirements correlate with the temperature-dependent, superconducting coherence length ξ(T). Many specimens obeyed the scaling law at temperatures T < Tc except near Tc, where ξ(T) is large in comparison with the precipitate size.

Transmission electron microscopy of electrodeposits

Commercial electrodeposits are usually fine grained and highly stressed. Conventional transmission electron microscopy (TEM) studies reveal defect-free structures except for the presence of twins. However, high voltage TEM studies of thick specimens show a high concentration of dislocations and lack of twins, which suggests a restructuring of electrodeposits during TEM specimen thinning.

Techniques for the production of thin foils from the interfacial regions of iron-zinc couples

Abstract In an effort to characterize interfacial microstructures in FeZn bimetallic couples, various techniques for the production of thin foils for examination with the transmission electron microscope (TEM) were developed. Microcrystalline arrays were observed in bright-field transmission electron microscopy images in the vicinity of the FeZn interface. Selected-area diffraction pattern analyses of these microcrystalline regions indicated the presence of several intermetallic phases and/or mixtures of these phases. These phases might originate during ion-beam thinning. However, it is argued that they could also form during room temperature aging.

A Preliminary Characterization of the Defect Structure of the Zeta Phase in the Interfacial Region of Fe-Zn Couples

A preliminary investigation of the defect structure of the monoclinic zeta phase, within the interfacial region of Fe-Zn couples, has been performed using cross-section transmission electron microscopy (TEM). Twin boundaries and dislocations have been unambiguously identified, however, examples of defects which, as of yet are unknown, are also presented. The monoclinic zeta phase was found to twin by a rotation of 180° about the normal to the (110) plane.

Discussion of “The effect of steel chemistry on the formation of Fe-Zn intermetallic compounds of galvanneal-coated steel sheets”

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