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Magnetic excitations in transition-metal ferromagnets. Recent progress and future prospects on neutron scattering experiments

Description: A review is given on current neutron scattering experiments at Brookhaven National Laboratory on transition-metal ferromagnets Ni, Fe, Pd/sub 2/MnSn and MnSi. The scattering intensity in constant-energy scans, observed above T/sub c/ in all of these materials, exhibited a clear peak at finite momentum transfers. Using a simple scattering function with double-Lorentzian shape, we demonstrate that this peak is a manifestation of simple diffusive spin fluctuations. Experimental results of several … more
Date: January 1, 1984
Creator: Uemura, Y.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evaluation of weldments in Type 21-6-9 stainless steel for Compact Ignition Tokamak structural applications: Phase 1

Description: Primary design considerations for the Compact Ignition Tokamak toroidal field-coil cases are yield strength and toughness in the temperature range from 77 to 300 K. Type 21-6-9 stainless steel, also still known by its original Armco Steel Company trade name Nitronic 40, is the proposed alloy for this application. It has high yield strength and usually adequate base metal toughness, but weldments in thick sections have not been adequately characterized in terms of mechanical properties or hot-cr… more
Date: June 1, 1991
Creator: Alexander, D. J.; Goodwin, G. M. & Bloom, E. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Advanced Gas Cooled Nuclear Reactor Materials Evaluation and Development Program. Progress report, January 1, 1980-March 31, 1980

Description: Results are presented of work performed on the Advanced Gas-Cooled Nuclear Reactor Materials Evaluation and Development Program. The objectives of this program are to evaluate candidate alloys for Very High Temperature Reactor (VHTR) Nuclear Process Heat (NPH) and Direct Cycle Helium Turbine (DCHT) applications, in terms of the effect of simulated reactor primary coolant (helium containing small amounts of various other gases), high temperatures, and long time exposures, on the mechanical prope… more
Date: June 25, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Material Considerations in the Design of a Bulk Shield for the Fusion Engineering Device

Description: The FED bulk shield provides protection from high-energy neutrons and gamma rays and removes nuclear heat generated. Bulk shield optimization calculations were conducted using the Los Alamos ONEDANT discrete ordinates and the General Atomic PATH point kernel codes. Six candidate steel alloys were considered.
Date: January 1, 1981
Creator: Kirchner, J. & Engholm, B. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Quarterly Status Report on LAMPRE Program for Period Ending May 20, 1962

Description: During the report period 110 Mw-hr of operation were completed by LAMPRE I at various power levels, and observations were made of control element performance and reactivity losses. Metallographic examination of a Core I capsule having 120 Mw-hr of irradiation exposure disclosed no major attack. Core II utilizes Ta alloy melts and 13 fuel melts. Starting materials for Core II capsules are tabulated. In research and development a gamma-ray conversion television was used to observe the flow of mol… more
Date: June 1, 1962
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Quarterly Status Report on LAMPRE Program for Period Ending February 20, 1962

Description: BS>LAMPRE I. The reactor operation is discussed. A malfunction in the shim operation was found and corrective measures taken. The core reloadings and other reactor modifications are described. The results of a gamma scanning of a fuel capsule are given. Fuel and Container Development. The properties and behavior of the Core I and the materials developed for Core II are described. Corrosion tests were carried out on pure Ta containers with molten Pu-Ce-Co alloys at 750 to 900 deg C, and the resu… more
Date: March 1, 1962
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Muon Spin-Relaxation Measurements of the Fluctuation Modes in Spin-Glass AgMn

Description: Recently reported zero-field ..mu..SR measurements below the spin-glass transition temperature in AgMn (1.6 at. %) show a temperature dependent inhomogenous width. We discuss these data in terms of a model in which the local field undergoes limited-amplitude fluctuations. We find that both very slow (approx. 0.3 ..mu..s/sup -1/) and rapid (approx. 3000 ..mu..s/sup -1/) fluctuations are required.
Date: January 1, 1982
Creator: Heffner, R. H.; Leon, M.; Schillaci, M. E.; MacLaughlin, D. E. & Dodds, S. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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NMR studies of hydrogen relaxation and diffusion in TiFeH/sub x/ and TiFe/sub 1-y/Mn/sub y/H/sub x/

Description: TiFe and related intermetallic compounds react directly with hydrogen gas to form hydrides which are suitable for energy storage applications. Although some of the characteristics of these materials have been evaluated, many important physical properties such as crystal structures, electronic structures, and hydrogen diffusion behavior are unknown. Since nuclear magnetic resonance (NMR) provides detailed information on the physical states of the hydrogen atoms, various NMR parameters are being … more
Date: January 1, 1977
Creator: Bowman, R.C. Jr.; Carter, G.C.; Chabre, Y. & Attalla, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Failure of sheathed thermocouples due to thermal cycling

Description: Open circuit failures (up to 100%) in small-diameter thermocouples used in electrically heated nuclear fuel rod simulator prototypes during thermal cycling tests were investigated to determine the cause(s) of the failures. The experiments conducted to determine the relative effects of differential thermal expansion, wire size, grain size, and manufacturing technology are described. It was concluded that the large grain size and embrittlement which result from certain common manufacturing anneal… more
Date: March 1, 1982
Creator: Anderson, R.L. & Ludwig, R.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Low alloy steels for thick wall pressure vessels. Yearly report, October 1, 1976--September 30, 1977

Description: A summary is presented of progress during the first year of a program to modify current ferrous alloys and develop new low-alloy steels that can be field-fabricated into large-diameter, thick-walled pressure vessels for commercial coal gasifiers. Determination of design criteria for the pressure vessel steels, incorporating information gained through review of the literature and gained through interaction with industry, national laboratory personnel, and research contractors is described. Work … more
Date: January 1, 1977
Creator: Horn, R. M.; Parker, E. R. & Zackay, V. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Study of grain boundary segregation using the Auger electron emission technique. Annual Technical Progress Report January 1, 1979-December 31, 1979

Description: The influence of grain boundary chemical composition on hydrogen embrittlement was investigated. Auger electron spectroscopy was employed to determine the grain boundary compositions of nickel-copper alloys containing various concentrations of phosphorus and subjected to various thermal treatments. Phosphorus segregates to grain boundaries during slow cooling, accompanied by reduced concentrations of grain boundary copper. Tensile tests were conducted in air and following cathodic charging with… more
Date: January 1, 1980
Creator: Stein, D. F.; Heldt, L. A. & Funkenbusch, A. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Precipitation reactions in a beryllium-bearing stainless steel

Description: Precipitation reactions in a beryllium-bearing stainless steel alloy have been studied by TEM and electron diffraction for ageing temperatures between 400/sup 0/ and 900/sup 0/C. The nominal composition of the alloy was 38% Ni - 21% Cr - 1% Mn - 0.5% Be - Bal Fe. Specimens were solutionized for one hour at 1150/sup 0/C and water quenched. The ageing reaction was studied by hardness measurements for times between 0.5 and 16 hours. The TEM specimens dicussed herein were made from samples aged one… more
Date: January 1, 1980
Creator: Carr, M. J. & Heiple, C. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Study of grain boundary segregation using the Auger electron emission technique. Annual technical progress report, VIII, January 1-December 31, 1978

Description: The susceptibility of nickel-copper alloys to liquid metal embrittlement was studied by Auger spectroscopy. Alloys corresponding to Monel 400 with various levels of additional phosphorous were employed and were given various thermal treatments to control the extent of segregation. Segregation of phosphorous to the boundaries, with accompanying decreases in copper and nickel concentrations, greatly reduces susceptibility to intergranular embrittlement by mercury.
Date: January 1, 1978
Creator: Stein, D. F.; Heldt, L. A. & Funkenbusch, A. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Corrosion of high Ni-Cr alloys and Type 304L stainless steel in HNO/sub 3/-HF

Description: Nineteen alloys were evaluated as possible materials of construction for steam heating coils, the dissolver vessel, and the off-gas system of proposed facilities to process thorium and uranium fuels. Commercially available alloys were found that are satisfactory for all applications. With thorium fuel, which requires HNO/sub 3/-HF for dissolution, the best alloy for service at 130/sup 0/C when complexing agents for fluoride are used is Inconel 690; with no complexing agents at 130/sup 0/C, Inco… more
Date: April 1, 1980
Creator: Ondrejcin, R.S. & McLaughlin, B.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effects of surface condition on the corrosion of candidate structural materials in a simulated HTGR-GT environment

Description: A simulated high-temperature gas-cooled reactor (HTGR) helium environment was used to study the effects of surface finish conditions on the subsequent elevated-temperature corrosion behavior of key candidate structural materials. The environment contained helium with 500 ..mu..atm H/sub 2//50 ..mu..atm CO/50 ..mu..atm CH/sub 4//<0.5 ..mu..atm H/sub 2/O at 900/sup 0/C with total test exposure durations of 3000 hours. Specimens with lapped, grit-blasted, pickled, and preoxidized surface condition… more
Date: February 1, 1980
Creator: Thompson, L.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of plating thickness standards. Milestone report

Description: Standards which are unavailable from the National Bureau of Standards were developed to support the nondestructive measurement of plating thickness. Their fabrication, measurement, certification, and calibration-recall schedule are discussed. Reference standards that have been put into service include aluminum/Kapton, silver/copper, tin/steel, gold/silver, cadmium/Kovar, silver/iron, rhodium/copper, and gold/ceramic. 6 figures, 3 tables.
Date: January 1, 1978
Creator: Russell, R. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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THE EFFECT OF MANGANESE AND SILICON CONTENT ON THE HOT WORKABILITY OF TYPE 304 STAINLESS STEEL CONTAINING 2 w/o BORON

Description: Increased hot workability of Type 304 stainless steel containing approximately 2 wt% boron was obtained by maintaining the manganese and silicon contents of the alloy above minimum levels of 1.40 and 0.60 wt%, respectively. Close control of the range of temperatures over which hot working was carried out was also demonstrated to be of importance. However, over the range investigated variation in the temperature of hot working was of secondary significance as compared with alloy composition. (au… more
Date: October 1, 1961
Creator: Hymes, L. C. & Balai, N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Tearing during pinch-off of Rolamite fill tubes

Description: A failure mechanism is proposed to explain the bubble streaming and trichloroethylene infiltration which has been observed in failed Rolamite devices. An intergranular oxide network forms in the Kovar fill tube as a result of the glass-to-metal seal processing; it is suggested that tearing occurs in this oxide network during a subsequent pinching-off operation. It is demonstratd that bending over a mandrel causes this intergranular network to widen and deepen in a tearing mode. A modified preox… more
Date: November 1, 1981
Creator: Yost, F.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Influence of alloy composition on the cryogenic mechanical properties of AISI 200 grade high-manganese austenitic steels

Description: Research on the effect of composition on the cryogenic mechanical properties of high-Mn austenitic steels showed that both the yield strength and change of strength with alloy processing increased significantly with increasing interstitial content. Alloy toughness deteriorated if carbon content was raised to 0.1% or higher or if delta-ferrite was retained in the as-cooled alloy. On the basis of these investigations an alloy of nominal composition 18Mn-5Ni-16Cr-0.024C-0.22 N was made and tested … more
Date: May 1, 1982
Creator: Ogawa, R. & Morris, J.W. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effects of Si and Ti on the phase stability and swelling behavior of AISI 316 stainless steel. [Neutron and heavy ion irradiations]

Description: Swelling behavior of neutron irradiated stainless steels is influenced by solute segregation and preciptation phenomena. The extent to which in-reactor swelling behavior may be simulated by heavy ion irradiation depends upon the extent to which in-reactor phase changes are reproduced; this question is addressed by comparing the precipitation behavior under neutron irradiation with behavior during 4 MeV Ni ion irradiation for AISI 316 stainless steel and a related stainless steel containing addi… more
Date: January 1, 1978
Creator: Lee, E.H.; Rowcliffe, A.F. & Kenik, E.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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An investigation of the sensitization behavior of Fe-Mn-Cr austenitic steels

Description: Standard chemical immersion (modified Strauss) tests and analytical electron microscopy (AEM) showed that reduced activation austenitic steels based on Fe-20Mn-12Cr-0.25C (wt %) are extremely prone to thermal sensitization and intergranular corrosion because of their high carbon contents and low chromium concentrations. This susceptibility to sensitization after thermal aging, fabrication, or irradiation makes their use in aqueous and other certain environments problematical. Excellent correlat… more
Date: January 1, 1989
Creator: Bell, G.E.C.; Tortorelli, P.F.; Kenik, E.A. (Oak Ridge Associated Universities, Inc., TN (USA) & Oak Ridge National Lab., TN (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Sliding wear, toughness and microstructural relationships in high strength Fe/Cr/C experimental steels

Description: Hardness has been believed to be the major parameter influencing wear resistance of materials. Recently, it was suggested that combinations of high strength and toughness may lead to optimum wear resistance. It is known that the martensite transformation can be exploited to provide a variety of strength-toughness combinations. Small additions of Mn or Ni to the Fe/4Cr/.3C martensitic alloys have been shown to increase toughness while maintaining strength via increasing the volume fraction of re… more
Date: June 1, 1980
Creator: Salesky, W.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Lifetime improvement of sheathed thermocouples for use in high-temperature and thermal transient operations

Description: Premature failure of small-diameter, magnesium-oxide-insulated sheathed thermocouples occurred when they were placed within nuclear fuel rod simulators (FRSs) to measure high temperatures and to follow severe thermal transients encountered during simulation of nuclear reactor accidents in Oak Ridge National Laboratory (ORNL) thermal-hydraulic test facilities. Investigation of thermally cycled thermocouples yielded three criteria for improvement of thermocouple lifetime: (1) reduction of oxygen … more
Date: January 1, 1982
Creator: McCulloch, R.W. & Clift, J.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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