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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.
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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.
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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.
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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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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.
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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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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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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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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.
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Partner: UNT Libraries Government Documents Department
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Inhibiting pitting corrosion in carbon steel exposed to dilute radioactive waste slurries

Description: Dilute caustic high-level radioactive waste slurries can induce pitting corrosion in carbon steel. Cyclic potentiodynamic polarization tests were conducted in simulated and actual waste solutions to determine minimum concentrations of sodium nitrate which inhibit pitting in ASTM A537 class 1 steel exposed to these solutions. Susceptibility to pitting was assessed through microscopic inspection of specimens and inspection of polarization scans. Long-term coupon immersion tests were conducted to … more
Date: January 1, 1991
Creator: Zapp, P. E. & Hobbs, D. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optimization of film synthesized rare earth transition metal permanent magnet systems

Description: This report reviews work on the optimization of film synthesized rare earth transition metal permanent magnet systems. Topics include: high coercivity in Sm-Fe-Ti-V, Sm-Fe-V, and two element systems; ThMn{sub 12} type pseudobinary SmFe{sub 12 {minus} X}T{sub X}; and sputter process control for the synthesis of precisely textured RE-TM magnetic films. (JL)
Date: January 1, 1990
Creator: Cadieu, F.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Microstructure and hydriding studies of AB/sub 5/ hydrogen storage compounds. Final report

Description: New data on the microstructure, pressure-composition-temperature, and absorption/desorption kinetics of AB/sub 5/ metal hydrides are presented. The most significant result to emerge from the investigation is that many of the AB/sub 5/ metal hydrides, especially the LaNi/sub 5/ related materials, show instantaneous absorption and desorption response in proportion to the amount of cooling or heating which is provided. Eight categories of materials were studied: reference alloys (LaNi/sub 5/, LaNi… more
Date: January 1, 1980
Creator: Goodell, P. D.; Sandrock, G. D. & Huston, E. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The effect of magnetic impurities and barriers on the magnetization and critical current of fine filament NbTi composites

Description: It has been shown that the highest critical currents in fine filament NbTi conductors are obtained when the filaments are closely spaced. However, the filaments in a composite with a high purity copper matrix tend to be coupled via the ''proximity effect'' as the filament spacing is reduced leading to large magnetization at low fields. To reduce the ''proximity'' coupling, trial billets of NbTi have been fabricated with Cu-30% Ni matrix, Cu-0.5% Mn matrix and one with a Ni barrier around the fi… more
Date: January 1, 1987
Creator: Ghosh, A.K.; Sampson, W.B.; Gregory, E.; Kreilick, S. & Wong, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mechanical threshold of dynamically deformed copper and Nitronic 40

Description: Measurements of the mechanical threshold, or threshold stress, are reported on quasi-statically and dynamically deformed copper and Nitronic 40. Results for copper show that the increase of the threshold stress with strain rate is similar to that of the flow stress. In Nitronic 40 the results show that the ratio of the flow stress to the threshold stress is approx.0.6. Both results indicate that the increased rate sensitivity found in these materials at high strain rates is not due to the predo… more
Date: January 1, 1985
Creator: Follansbee, P.S.; Kocks, U.F. & Regazzoni, G.
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Partner: UNT Libraries Government Documents Department
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Polarized neutrons and their applications

Description: The role of polarized neutrons in the study of magnetic and nonmagnetic materials is discussed. magnetic structure, spin density, nuclear magnetism and spin dynamics are listed as magnetic properties which may be accessed by polarized neutrons. Low dimensional magnets, disordered magnetic systems, surface magnetism are discussed as well as topography and depolarization. Polarization techniques are discussed for both study state and pulsed modes. 4 refs. (WRF)
Date: January 1, 1985
Creator: Moon, R.; Endoh, Y.; Felcher, G.; Majkrzak, C.; Mezei, F.; Pynn, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Magnetic behavior at the iron sites in Pd Fe Mn alloys

Description: Moessbauer Effect hyperfine measurements of (Pd/sub 0/ /sub 9965/Fe/sub 0/ /sub 0035/)/sub 1-x/Mn/sub x/ have been obtained for 1.1 < T < 30 K and 0 < H < 6T for x = 0.01, 0.05, 0.06, and 0.065. Ferromagnetic ordering is clear for x = 0.01 and is suggested for x = 0.05 at 4 K. At 1.1 K ordering at the iron sites in all samples, except x = 0.01, is consistent with a spin-glass or antiferromagnetic phase.
Date: January 1, 1979
Creator: Taylor, R. D. & Willis, J. O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fluxless laser soldering for electronic packaging

Description: Conventional soldering typically requires the use of reactive fluxes to promote wetting. The resulting flux residues are removed primarily with halogenated or chlorofluorocarbon (CFC) solvents. With the mandated phaseout of CFCs by the year 2000, there has been a concentrated effort to develop alternative, environmentally compatible manufacturing and cleaning technologies that will satisfy the restrictions placed on CFCs, but still yield high quality product. Sandia National Laboratories is cur… more
Date: January 1, 1991
Creator: Hosking, F M & Keicher, D M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Two-body, dry abrasive wear of Fe/Cr/C experimental alloys - relationship between microstructure and mechanical properties

Description: A systematic study of abrasive wear resistance of Fe/Cr/Mn based alloys has been carried out using a two body pin-on-disc wear machine. Abrasives used were silicon carbide, alumina and quartz. The objective of this study was to evaluate the abrasive wear resistance and to investigate the relationships between microstructure, mechanical properties, and abrasive wear resistance for these experimental alloys. Several commercial alloys were also tested to provide a basis for comparison. The goal of… more
Date: January 1, 1982
Creator: Kwok, C.K.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Corrosion of Fe-Cr-Mn alloys in thermally convective lithium

Description: A series of austenitic Fe-Cr-Mn steels was exposed to circulating lithium at temperatures up to 500/sup 0/C. Two groups of the alloys, which contained 12 to 30 wt % Mn and 2 to 20 wt % Cr, were sequentially exposed for periods greater than 3000 h in a type 316 stainless steel thermal convection loop. Mass transfer of manganese caused very large weight losses from the steels containing 30 wt % Mn. However, the actual magnitude of corrosion losses for alloys containing 12 to 20 wt % Mn was diffic… more
Date: January 1, 1986
Creator: Tortorelli, P. F. & DeVan, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Comparison of the irradiated tensile properties of a high-manganese austenitic steel and type 16 stainless steel

Description: The USSR steel EP-838 is a high-manganese (13.5%), low-nickel (4.2%) steel that also has lower chromium and molybdenum than type 316 stainless steel. Tensile specimens of 20%-cold-worked EP-838 and type 316 stainless steel were irradiated in the High Flux Isotope Reactor (HFIR) at the coolant temperature (approx. 50/sup 0/C). A displacement damage level of 5.2 dpa was reached for the EP-838 and up to 9.5 dpa for the type 316 stainless steel. Tensile tests at room temperature and 300/sup 0/C on … more
Date: January 1, 1983
Creator: Klueh, R.L. & Grossbeck, M.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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