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Tensile properties of bare-rolled ingot-sheet beryllium from room temperature to 800$sup 0$C

Description: Tensile properties of bare-rolled ingot-sheet beryllium from room temperature to 800 deg C are reported. While strength values show a steady decrease above room temperature, tensile elongations exhibit peaks at approximately 300 and 700 deg C. The strainhardening exponent varies with temperature and amount of strain, and ranges between approximately 0.10 and 0.26. Metallographic examinations reveal cleavage fracture at the lower temperatures, accompanied by severe grain deformation above room temperature. This is followed by a temperature range in which ductile rupture occurs, and finally, at the higher temperatures, grainboundary failure. The low BeO content of this material and the post-rolling heat treatment given to the sheet are factors which improve the high-temperature ductility as compared to other grades of beryllium. (auth)
Date: December 13, 1973
Creator: Miley, D.V. & Brugger, R.P.
Partner: UNT Libraries Government Documents Department

Specimen mounting methods for metallography

Description: >The development of metallographic mounting methods is reviewed and several of the more common methods being used are discussed. Characteristic advantages and disadvantages are pointed out. Retention of sample edges for examination is essential in many investigations, and a separate section is devoted to the many techniques devised to achieve this goal. It is noted that there is a mounting technique available for virtually any type of specimen. (14 figures, 6 tables, 57 references) (JRD)
Date: January 1, 1973
Creator: Miley, D. V. & Calabra, A. E.
Partner: UNT Libraries Government Documents Department

Barium silicate glass/Inconel X-750 interaction. [PWR]

Description: Water reactor safety programs at the Idaho National Engineering Laboratory have required the development of specialized instrumentation. An example is the electrical conductivity-sensitive liquid level transducer developed for use in pressurized-water reactors (PWRs) in which the operation of the sensing probe relies upon the passage of current through the water between the center pin of the electrode and its shell such that when water is present the resulting voltage is low, and conversely, when water is absent the voltage is high. The transducer's ceramic seal is a hot-pressed glass ceramic; its metal housing is Inconel X-750. The ceramic material provides an essential dielectric barrier between the center pin and the outer housing. The operation of the probe as well as the integrity of the PWR environment requires a hermetically-bonded seal between the ceramic and the metal. However, during testing, an increasing number of probe assemblies failed owing to poor glass-to-metal seals as well as void formation within the ceramic. Therefore, a program was initiated to characterize the metallic surface with respect to pre-oxidation treatment and determine optimum conditions for wetting and bonding of the metal by the glass to obtain baseline data relevant to production of acceptable transducer seals.
Date: January 1, 1980
Creator: Kelsey, P.V. Jr.; Siegel, W.T. & Miley, D.V.
Partner: UNT Libraries Government Documents Department