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High temperature oxidation of beryllium modified intermetallic compounds of the niobium-chromium system

Description: Intermetallic compounds based on the Laves phases NbCr2 and TiCr2 are of interest for high temperature applications. At temperatures where the high temperature strength and creep resistance of these compounds are excellent, their oxidation resistance is relatively poor. Beryllide compounds in the 3-Be, Ti-Be and Nb-Be systems (CrBe2, TiBel2, TiBez, NbBel2) on the other hand, exhibit excellent oxidation resistance even at temperaturets in excess of 1200' C, due to the formation of protective Be0… more
Date: January 1, 2001
Creator: Hanrahan, Robert J.; Peters, Maria I.; Cooley, Jason C.; Hults, William L.; Thoma, Dan J. & Chen, Katherine C.
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Partner: UNT Libraries Government Documents Department
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Structure/property relationships in multipass GMA welding of beryllium.

Description: Beryllium is an interesting metal that has a strength to weight ratio six times that of steel. Because of its unique mechanical properties, beryllium is used in aerospace applications such as satellites. In addition, beryllium is also used in x-ray windows because it is nearly transparent to x-rays. Joining of beryllium has been studied for decades (Ref.l). Typically joining processes include braze-welding (either with gas tungsten arc or gas metal arc), soldering, brazing, and electron beam we… more
Date: January 1, 2001
Creator: Hochanadel, P. W. (Patrick W.); Hults, W. L. (William L.); Thoma, D. J. (Dan J.); Dave, V. R. (Vivek R.); Kelly, A. M. (Anna Marie); Pappin, P. A. (Pallas A.) et al.
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Partner: UNT Libraries Government Documents Department
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High-resolution neutron-induced [gamma]-ray production cross sections for oxygen and beryllium for neutron energies from 4 to 200 MeV.

Description: Measurements of discrete gamma-ray spectra from neutron-induced reactions on a Be0 sample have been performed using the broad-spectrum neutron spallation source of the WNR facility at LANSCE. Incident neutron energies were determined by the time-of-flight technique. Two high-purity Ge detectors were used to detect gamma rays in the energy range from 0.150 to 9.0 MeV. Spectra were measured at seven angles. Absolute gamma-ray production cross sections were delermined from the measured neutron flu… more
Date: January 1, 2001
Creator: Nelson, R. O. (Ronald O.); Michaudon, A. F. (André F.); Chadwick, M. B. (Mark B.) & Young, P. G. (Phillip Gaffney),
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Partner: UNT Libraries Government Documents Department
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Equal Channel Angular Extrusion (ECAE) of Beryllium.

Description: The Equal Channel Angular Extrusion (ECAE) technique has been applied to a P/M source Be alloy. Single and two-pass extrusions have been successfully completed, using two different processing routes, on Ni-canned billets of Be at 400 C. No cracking was observed in the billet and significant grain refinement was achieved. In this paper, microstructural features and dislocation structures are discussed for the single-pass material, including evidence of <c> and <c+a> dislocations. Sig… more
Date: January 1, 2001
Creator: Field, Richard D.; Hartwig, K. T.; Necker, Carl T.; Bingert, John F. & Agnew, Sean R.
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Partner: UNT Libraries Government Documents Department
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Combined in-situ dilatometer and contact angle studies of interfacial reaction kinetics in brazing.

Description: Multi-component dissimilar material braze joints as shown in Figure 1 consisting of dissimilar base materials, filler materials and wetting agents are of tantamount importance in a wide variely of applications. This work combines dilatometry and contact angle measurements to characterize in-situ the multiple interfacial reaction pathways that occur in such systems. Whereas both of these methods are commonly used tools in metallurgical investigation, their combined use within the context of braz… more
Date: January 1, 2001
Creator: Dave, Vivek R.; Javernick, Daniel A.; Thoma, Dan J.; Cola, Mark J.; Hollis, Kendall J.; Smith, Frank M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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FEA Analysis of AP-0 Target Hall Collection Lens (Current Design)

Description: The AP-0 Target Hall Collection Lens is a pulsed device which focuses anti-protons just downstream of the Target. Since the angles at which the anti-protons depart the Target can be quite large, a very high focusing strength is required to maximize anti-proton capture into the downstream Debuncher Ring. The current design of the Collection Lens was designed to operate with a focusing gradient of 1,000 T/m. However, multiple failures of early devices resulted in lowering the normal operating gra… more
Date: June 22, 2001
Creator: Hurh, P.G. & Tang, Z.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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METAL ION ANALYSIS USING NEAR-INFRARED DYES AND THE ''LABORATORY-ON-A-CHIP''

Description: The DOE currently has the daunting task of deactivating 7,000 contaminated buildings and decommissioning 900 contaminated buildings that remain from the United States' involvement in nuclear weapons development over the last 50 years.1 In addition to decontaminating the metal and concrete building materials that comprise these building structures, this program will require the decontamination and disposal of more than 180,000 metric tons of scrap metal.1 The DOE is also currently entrenched in … more
Date: September 15, 2001
Creator: Collins, Greg E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Underground Corrosion of Activated Metals in an Arid Vadose Zone Environment

Description: The subsurface radioactive disposal site located at the Idaho National Engineering and Environmental Laboratory contains neutron-activated metals from nonfuel nuclear-reactor- core components. A long-term corrosion test is being conducted to obtain site-specific corrosion rates to support efforts to more accurately estimate the transfer of activated elements in an arid vadose zone environment. The tests use nonradioactive metal coupons representing the prominent neutron-activated material burie… more
Date: October 24, 2001
Creator: Adler Flitton, M. K.; Mizia, R. E. & Bishop, C. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Results of The Analysis of The Blood Beryllium Lymphocyte Proliferation Test Data From The Oak Ridge Y-12 Study

Description: The potential hazards from exposure to beryllium or beryllium compounds in the workplace were first reported in the 1930s. The tritiated thymidine beryllium lymphocyte proliferation test (BeLPT) is an in vitro blood test that is widely used to screen beryllium exposed workers in the nuclear industry for sensitivity to beryllium. Newman [18] has discussed the clinical significance of the BeLPT and described a standard protocol that was developed in the late 1980s. Cell proliferation is measured … more
Date: December 18, 2001
Creator: Frome, EL
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Liquid Scoping Study for Tritium-Lean, Fast Ignition Inertial Fusion Energy Power Plants

Description: In a thick-liquid protected chamber design, such as HYLIFE-II, a molten-salt is used to attenuate neutrons and protect the chamber structures from radiation damage. The molten-salt absorbs some of the material and energy given off by the target explosion. In the case of a fast ignition inertial fusion system, advanced targets have been proposed that may be Self-sufficient in the tritium breeding (i.e., the amount of tritium bred in target exceeds the amount burned). These ''tritium-lean'' targe… more
Date: August 14, 2001
Creator: Schmitt, R. C.; Latkowski, J. F.; Durbin, S. G.; Meier, W. R. & Reyes, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Beryllium Materials for National Ignition Facility Targets LDRD Final Report

Description: The National Ignition Facility (NIF) will require spherical ignition capsules approximately 2 mm in diameter with a 120- to 150-pm-thick ablator. Beryllium-based alloys are promising candidates for an ablator material due to their combination of low opacity and relatively high density (compared to polymer coatings). For optimum performance, the Be-coated capsules require a smooth surface finish, uniform thickness, microscopic homogeneity, and preferably high strength. The coatings must contain … more
Date: February 27, 2001
Creator: McEachern, R L
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Update of Environmental and Safety Analyses for the National Ignition Facility: Using a New Model to Track Target Material Usage

Description: The purpose of this paper is to report the methodology and assumptions, data, and results of calculations concerning safety and environmental issues related to excursions to currently planned NIF operations. Many possible uses of NIF have been suggested over the years. While some of these possible uses have been adopted into the baseline plans for NIF, many others have not. While we do not yet know all of the possible approved uses for NIF, one of the items that would bear on whether a certain … more
Date: August 3, 2001
Creator: Gillich, D; Tobin, M; Singh, M; Kalantar, D; Brereton, S & MacGowan, B
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Flibe Coolant Cleanup and Processing in the HYLIFE-II Inertial Fusion Energy Power Plant

Description: In the HYLIFE-II chamber design, a thick flowing blanket of molten-salt (Li{sub 2}BeF{sub 4}) called flibe is used to protect structures from radiation damage. Since it is directly exposed to the fusion target, the flibe will absorb the target debris. Removing the materials left over from target explosions at the rate of {approx}6/s and then recycling some of these materials poses a challenge for the inertial fusion energy power plant. The choice of target materials derives from multi-disciplin… more
Date: March 23, 2001
Creator: Moir, R W
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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New and Emerging Technologies for Real-Time Air and Surface Beryllium Monitoring

Description: In this study, five emerging technologies were identified for real-time monitoring of airborne beryllium: Microwave-Induced Plasma Spectroscopy (MIPS), Aerosol Beam-Focused Laser-Induced Plasma Spectroscopy (ABFLIPS), Laser-Induced Breakdown Spectroscopy (LIBS), Surfaced-Enhanced Raman Scattering (SERS) Spectroscopy, and Micro-Calorimetric Spectroscopy (CalSpec). Desired features of real-time air beryllium monitoring instrumentation were developed from the Y-12 CBDPP. These features were used a… more
Date: September 1, 2001
Creator: Phifer, B. E., Jr.; Churnetski, E. L.; Cooke, L. E.; Reed, J. J.; Howell, M. L. & Smith, V. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Novel Biomarker for Beryllium Sensitization in Humans - Final Report

Description: This research project will determine the T-cell receptor (TCR) gene usages of beryllium reactive T-lymphocytes isolated directly from the peripheral blood of individuals exposed at a U.S. Department of Energy site. The objective is to develop a sensitive and novel biomarker for identifying early human sensitization to environmental beryllium. This is a collaborative project involving the Genetics Laboratory of the University of Vermont and both the Center for Epidemiological Research and the sc… more
Date: April 16, 2001
Creator: Albertini, R. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Materials Selection for the HFIR Cold Neutron Source

Description: In year 2002 the High Flux Isotope Reactor (HFIR) will be fitted with a source of cold neutrons to upgrade and expand its existing neutron scattering facilities. The in-reactor components of the new source consist of a moderator vessel containing supercritical hydrogen gas moderator at a temperature of 20K and pressure of 15 bar, and a surrounding vacuum vessel. They will be installed in an enlarged beam tube located at the site of the present horizontal beam tube, HB-4; which terminates within… more
Date: August 24, 2001
Creator: Farrell, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Weak Transitions in A=6 and 7 Nuclei

Description: The {sup 6}He beta decay and {sup 7}Be electron capture processes are studied using variational Monte Carlo wave functions, derived from a realistic Hamiltonian consisting of the Argonne upsilon{sub 18} two-nucleon and Urbana-IX three-nucleon interactions. The model for the nuclear weak axial current includes one- and two-body operators with the strength of the leading two-body term - associated with Delta-isobar excitation of the nucleon -- adjusted to reproduce the Gamow-Teller matrix element… more
Date: January 1, 2001
Creator: Schiavilla, R. & Wiringa, R.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Influence of dopants on defect formation in GaN

Description: Influence of p-dopants (Mg and Be) on the structure of GaN has been studied using Transmission Electron Microscopy (TEM). Bulk GaN:Mg and GaN:Be crystals grown by a high pressure and high temperature process and GaN:Mg grown by metal-organic chemical-vapor deposition (MOCVD) have been studied. Structural dependence on growth polarity was observed in the bulk crystals. Spontaneous ordering in bulk GaN:Mg on c-plane (formation of Mg-rich planar defects with characteristics of inversion domains) w… more
Date: October 15, 2001
Creator: Liliental-Weber, Z.; Jasinski, J.; Benamara, M.; Grzegory, I.; Porowski, S.; Lampert, D. J. H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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