Abstract: Components (5) in a superalloy, in particular a dispersion hardened nickel based alloy, are connected together by pressure bonding in the solid condition with the greatest possible limitation of the overall deformation of the complete components (5) by lateral restraint (7), the actual bonding zone (6) having short-term intensive dynamic plastic flow imposed on it and, taking account of the deformation temperature, the local deformation rate .epsilon..sub.l and the local deformation .epsilon..sub.l referred to the bonding zone (6) are matched together in such a way that the driving force during the subsequent heat treatment of the complete workpiece above the recrystallization temperature is sufficient to force the formation of coarse grain under all conditions. It can then be assumed that, in general, the expression ##EQU1## h.sub.o =height of the bonding zone (6) before connection, h.sub.f =height of the bonding zone (6) after connection,D.sub.

Abstract: The arc withstanding electrodes in an electric circuit breaker for switching high voltages attain greater mechanical strength and improved arc withstanding capabilities by forming the arc withstanding electrodes of a carbon-fiber-reinforced-graphite material which material is constituted of a graphite matrix which is reinforced by carbon fibers embedded therein. A method for forming the carbon-fiber-reinforced-graphite of the arc electrodes and for affixing the arc electrodes to a metal carrier therefor includes the steps of employing a high-temperature solder based on copper and/or silver, containing at least one carbide-forming element such as, for example, Cr.

Abstract: Semi-finished products and finished components are manufactured, by hot working, from alloys of aluminum, copper, nickel and iron, with and without oxidic dispersoids, by a process wherein the deformation operation is carried out, isothermally, or quasi-isothermally, in a single step, at a temperature just below the solidus temperature of the alloy of the workpiece, at a comparatively low deformation rate, and at low specific deformation forces, the workpiece and the tool being kept, at least during the final, longer-lasting phase of the working operation, as precisely as possible at the same, maximum permissible temperature in the vicinity of the solidus line. The material is advantageously subjected to a preliminary homogenization heat-treatment at this maximum permissible temperature and cooling to room temperature, before the working process. Very good die-filling capacity.

Abstract: Using a heat resistant austenitic nickel based alloy, independent of the grain size in the initial material, a fine-grained finished part is produced from an unworked part which was not specially cultivated for fine grain, in a single operational step, consisting of isothermal forging.

Abstract: Shape-memory alloys comprised of Cu/Al or Cu/Al/Ni are produced by a powder metallurgical process wherein a coarse-grained powder of pre-alloyed and/or pre-mixed powder alloys having a grain size of 0.05 to 0.8 mm is introduced into a metal container which is then evacuated, sealed, and hot isostatically pressed. The resulting billet is then hot worked. In another embodiment, the powder is first placed in a rubber tube and cold isostatically pressed. The billet is then placed in a cylinder having deformable walls, such as a copper cylinder, the cylinder is sealed, and the powder therein is then hot isostatically pressed, and the billet so prepared is subjected to a homogenization heat treatment and hot working.

Abstract: A high-damping composite material, which consists of a metal or metal alloy base material having poor damping properties which determines the strength and shape of said material, and a metal or metal-alloy surface layer surrounding said base material on all sides which has high mechanical damping properties.

Abstract: A composite shaped article comprising at least one reinforcing core of a heat-resistant oxide-dispersion-hardened metal or alloy and a cladding of a heat-resistant metal or alloy which is compatible with the core material, the core being wholly encapsulated within and bonded to the cladding material.A method for making the articles is provided.

Abstract: A hot-cathode material in wire or sheet form, comprising a high-melting carrier metal, an oxide activator and a carbide reducing agent, and, optionally, a diffusion-promoting additive, the material comprising a core zone and at least one surface layer having different compositions or different concentrations of constituents therein which are such that, in operation, the rate of diffusion of the activator from the core zone is equal to or greater than the loss of activator from the surface layer. The material is made by a powder metallurgy/thermo-mechanical process.

Abstract: A method for powder metallurgical production of a high temperature alloy body consists of mixing powdered alloy components or pre-alloys in the desired proportions; cold working the mix under a protective atmosphere; canning the cold-worked powder mixture; compressing the canned powder by extrusion or hot isostatic pressing to a form of dense blank; cutting said blank into slices; forging them at a constant temperature within the range of from 0.6 to 0.75 of the melting point at a strain rate of from 10.sup.-3 to 10.sup.0 S.sup.-1 ; and thereafter subjecting the forged body to a coarse-grain annealing between 1230.degree. and 1300.degree. C for up to 3 hours.

Abstract: A method of producing a material with locally different properties comprises filling a form with at least two different component powders such that the ratio of contents of said powders in the mixture continuously varies over at least some spatial extent, compacting the mixed powders in the form, and subsequently sintering the compacted powders.

Abstract: A thermionic cathode of tungsten or molybdenum is made with an activating content of lanthanum oxide and is supplied with a carbonaceous reducing agent either by incorporation in the bulk material of the cathode body or by carburizing, so that the reducing agent comprises at least in part a carbide of the carrier metal. Lower operating temperatures and higher emissivity are obtained compared to thoriated tungsten filaments and longer useful life compared to other cathodes activated by other rare earth oxides. The temperature-emissivity characteristics are such that good results are obtainable even within the temperature range in which molybdenum is usable as a carrier material.

Abstract: A reaction cathode with high thermic emission which is especially suited for vacuum tube application and which contains a compound of a monolayer forming element which is liberated by a supply reaction which proceeds during the operation of the cathode, wherein the monolayer forming element is at least one of the elements selected from the group consisting of yttrium and lanthanum, and wherein said cathode further contains at least one metal selected from the group consisting of palladium, platinum, rhodium and ruthenium, as a diffusion-enhancing agent.