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in subjects: "Vanadium Alloys"

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Optimization of film synthesized rare earth transition metal permanent magnet systems

Progress is reported in three areas: high coercivity Sm-Fe-Ti-V, Sm-Fe-Zr, and two element Sm-Fe Sm{sub 5}(Fe,T){sub 17} type crystalline phases; ThMn{sub 12} type pseudobinary SmFe{sub 12-x}T{sub x}(0{le}{times}{le}1.5); and sputter process control for the synthesis of precisely textured rare earth-transition metal magnetic films. (DLC)

Date: January 1, 1992

Creator: Cadieu, F.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Materials technology for accelerator production of fissile isotopes

The materials used for the accelerator production of fissile isotopes must enable the facility to achieve maximum fuel production at a minimum cost. Neutron production in the target would be maximized by use of thorium cooled with Pb--56 percent Bi or with sodium. The thorium should be ion-plated with approximately 1 mil of nickel or stainless steel for retention of fission products. The target container will have to be replaced at frequent intervals because of the copious quantities of neutron… more

Date: February 1, 1978

Creator: Horak, J.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Superplasticity in a nickel silicide alloy: Microstructural and mechanical correlations

The superplastic properties of a nickel silicide based intermetallic alloy have been investigated as a function of strain, strain-rate, and temperature. The evolution of the microstructure during superplasticity, including grain growth, grain refinement, and cavitation, is reviewed. The relationship of the flow stress to strain and to strain-rate and the activation energy of the deformation process have been established. Finally, deformation mechanisms for superplasticity in the alloy at interm… more

Date: January 1, 1991

Creator: Stoner, S.L. (Lawrence Livermore National Lab., CA (United States)); Oliver, W.C. (Oak Ridge National Lab., TN (United States)) & Mukherjee, A.K. (California Univ., Davis, CA (United States). Dept. of Mechanical, Aeronautical and Materials Engineering)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Research Toward New Alloys for Generator Retaining Rings

The research reported here was undertaken to develop an alloy suitable for use in the retaining rings of two-pole electrical generators that would have three key properties: a yield strength of 200 ksi or greater with good residual toughness; resistance to hydrogen embrittlement and stress-corrosion cracking; and processability through heat treatment after hot forming, to avoid the necessity of cold forming of the ring. The principal alloy developed during the course of this work was an iron-ba… more

Date: November 1, 1981

Creator: Morris, J. W., Jr. & Chang, K. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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He self-pumping by tokamak pump limiter materials: Al, V, Ni, and Ni/Al alloys

An ECR plasma and Colutron ion gun were used to study He self-pumping by several possible pump-limiter materials: Ni, V, Al, and Ni/Al multi-layers. Ni and V exhibited similar pumping capacities (6 {times} 10{sup 15} He/cm{sup 2}, 200 eV) whereas Al showed a reduced capacity (6 {times} 10{sup 14} He/cm{sup 2}, 200 eV) due to increased sputtering. A He retention model based upon ion implantation ranges and sputtering rates agreed with the experimental data. The pumping efficiency increased signi… more

Date: January 1, 1991

Creator: Outten, C. A.; Barbour, J. C.; Doyle, B. L. & Walsh, D. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Designer's guide to the mechanical properties and fracture toughness of titanium 6Al--6V--2Sn

During the Phase 3 design of the B77 laydown bomb, titanium 6A1-6V-2Sn was chosen for certain structural components. Comprehensive mechanical property and fracture toughness information for this alloy were lacking, necessitating a test program keyed to the anticipated weapon environment and stockpile-to-target sequence. This report covers the mechanical tests of strength, notch sensitivity, and fracture toughness that were conducted. The results showed the duplex annealed condition to be most t… more

Date: November 1, 1977

Creator: Hickerson, J. P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Long-range-ordered alloys modified by Group IV-B metals

Ductile long range ordered alloys having high critical ordering temperatures exist in the (V,M)(Fe,Ni,Co)/sub 3/ system having the composition comprising by weight 20.6 to 22.6% V, 14 to 50% Fe, 0 to 64% Co, and 0 to 40% Ni, and 0.4 to 1.4% M, where M is a metal selected from the group consisting of Ti, Zr, Hf, and their mixtures. These modified alloys have an electron density no greater than 8.00 and exhibit marked increases at elevated temperature in ductility and other mechanical properties … more

Date: May 22, 1981

Creator: Liu, Chain T.; Inouye, Henry & Schaffhauser, Anthony C.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

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Metallurgy of continuous filamentary A15 superconductors

The early history of the bronze process is recapitulated and modifications to the process which have since followed are described. The metallurgical principles, which are involved in the process, are described including the kinetics of the compound growth, the effects of additives on the growth, etc. The superconducting properties of these compounds are also discussed. The influence of metallurgical variables on the superconducting properties is discussed in detail. In discussing the supercondu… more

Date: January 1, 1980

Creator: Suenaga, M

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Investigation of fracture toughness and fracture mechanisms using acoustic emission measurements

This report is the FINAL PROGRESS REPORT'' for the research program Investigation of Fracture Toughness and Fracture Mechanisms using Acoustic Emission Measurements.'' The time period covered by this report is from 1 March 1988 through August 1991. The research program consisted of three separate but closely related investigations: (1) An Investigation of the Acoustic Emission Generated during the Deformation and Fracture of Premium Grade 4340 Steel as a function of Mechanical Properties. (2) A… more

Date: January 1, 1991

Creator: Carpenter, S.H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Corrosion protection and galvanic corrosion prevention for 7075 Al and Ti-6Al-6V-2Sn alloys. Final report

Sulfuric-acid-anodized and electroless-nickel-plated 7075 aluminum alloy panels successfully passed 96 hours of salt spray testing when galvanically coupled to duplex-annealed Ti-6Al-6V-2Sn alloy panels. Adherent paint deposits were produced on the titanium alloy and electroless nickel surfaces using a wash primer, an epoxy primer, and a urethane paint coating. A painted part survived 35 cycles of alternating salt spray and hot and freezing environments without blistering. A low chloride cuttin… more

Date: July 1, 1980

Creator: Clay, F.A.

Item Type: 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

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: Report

Partner: UNT Libraries Government Documents Department

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Microstructure and magnetic properties

The relationship between the microstructure and magnetic properties of heat treated Fe-23 wt percent Cr--15 wt percent Co--5 wt percent V has been studied by transmission electron microscopy and Lorentz microscopy. Three different heat treatments were adopted for the present investigations viz., (1) isothermal aging, (2) TMT (thermomagnetic treatment) + step-aging, (3) continuous cooling. It has been found that the magnetic properties of the alloy are very sensitive to the temperature of the th… more

Date: December 1, 1977

Creator: Belli, Y.; Okada, M.; Thomas, G.; Homma, M. & Kaneko, H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Fusion blanket inherent safety assessment

The inherent safety aspect of TPSS reactor blankets has been investigated. The idea is to design the blanket so safe that cost savings can be realized such as through non-nuclear grading construction. If the blanket materials are carefully selected, inherent safety is feasible for fusion reactor blankets up to 5 to 10 MW/m/sup 2/ neutron wall loading.

Date: January 1, 1986

Creator: Sze, D.K.; Jung, J. & Cheng, E.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Effects of test environment and grain size on the tensile properties of L1 sub 2 -ordered (Co,Fe) sub 3 V alloys

The influence of test environment, grain size, and heat treatment on the tensile properties and fracture behavior of L1{sub 2}-ordered (Co{sub 78}Fe{sub 22}){sub 3}V and (Co{sub 85}Fe{sub 15}){sub 3}V alloys was studied at room temperature. The tensile ductility depends strongly on test environments; the elongation decreases in the sequence of oxygen, vacuum, air, and distilled water. The loss in elongation is accompanied by a change in fracture mode from transgranular to intergranular. When te… more

Date: January 1, 1991

Creator: Nishimura, C. & Liu, C.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Ductile superconducting wire through novel metallurgical techniques

Ductile superconducting wires can be formed through controlled precipitation of the A15 phase from supersaturated solution in the solid state. The current research has focused on melting, homogenizing, and thermomechanically processing supersaturated solutions of Ga in V. A diagram of the rolling process is given. (SDF)

Date: January 1, 1978

Creator: Hong, M. & Morris, J.W. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Engineering design of a liquid metal cooled self-pumped limiter for a tokamak reactor

A lithium cooled self-pumped limiter has been designed as the impurity control system for the TPSS high-..beta.. power reactor conceptual design. The limiter removes helium by trapping impinging helium ions in freshly deposited vanadium surface layers in a slot region. No hydrogen is removed and no pumps or vacuum penetrations are used, thereby eliminating penetration shielding and reducing tritium handling. The limiter is composed of a vanadium alloy structure with a 2mm tungsten cladding on t… more

Date: October 1, 1987

Creator: Brooks, J. N.; Cha, Y.; Hassanein, A.; Majumdar, S.; Mattas, R. F. & Smith, D. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Mechanical behavior and stress effects in hard superconductors: a review

The mechanical properties of type II superconducting materials are reviewed as well as the effect of stress on the superconducting properties of these materials. The bcc alloys niobium-titanium and niobium-zirconium exhibit good strength and extensive ductility at room temperature. Mechanical tests on these alloys at 4.2/sup 0/K revealed serrated stress-strain curves, nonlinear elastic effects and reduced ductility. The nonlinear behavior is probably due to twinning and detwinning or a reversib… more

Date: November 1, 1977

Creator: Koch, C. C. & Easton, D. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Alloy development for irradiation performance. Quarterly progress report for period ending December 31, 1979

Progress is reported concerning preparation of a materials handbook for fusion, creep-fatigue of first-wall structural materials, test results on miniature compact tension fracture toughness specimens, austenitic stainless steels, Fe-Ni-Cr alloys, iron-base alloys with long-range crystal structure, ferritic steels, irradiation experiments, corrosion testing, and hydrogen permeation studies. (FS)

Date: April 1, 1980

Creator: Ashdown, B. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Resistance spot welding of Ti-6A1-4V alloy

The effects of weld power, electrode force, electrode tip radius, and elapsed time between cleaning and welding on resistance spot welds in Ti-6Al-4V alloy were evaluated. The alloy is weldable by this technique, and a wide latitude can be taken in processing variables.

Date: June 1, 1980

Creator: Jarboe, D.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Cluster expansion of fcc Pd-V intermetallics

A cluster expansion is used to compute fcc ground states from first principles for the Pd-V system. Intermetallic structures are not assumed but derived rigorously by minimizing the configurational energy subject to linear constraints. A large number of concentration-independent interactions are calculated by the method of direct configurational averaging. Agreement with the fcc-based portion of the experimentally-determined Pd-V phase diagram is quite satisfactory. 25 refs., 2 figs.

Date: June 1, 1991

Creator: de Fontaine, D.; Wolverton, C.; Ceder, G. (Lawrence Berkeley Lab., CA (United States)) & Dreysse, H. (Nancy-1 Univ., 54 (France). Lab. de Physique du Solide)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Materials considerations for the coupling of thermochemical hydrogen cycles to tandem mirror reactors

Candidate materials are discussed and initial choices made for the critical elements in a liquid Li-Na Cauldron Tandem Mirror blanket and the General Atomic Sulfur-Iodine Cycle for thermochemical hydrogen production. V and Ti alloys provide low neutron activation, good radiation damage resistance, and good chemical compatibility for the Cauldron design. Aluminide coated In-800H and siliconized SiC are materials choices for heat exchanger components in the thermochemical cycle interface.

Date: May 23, 1980

Creator: Krikorian, O.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Effects of hydrostatic pressure on the changes in elastic constants caused by hydrogen in vanadium and Nb/sub 53/Ta/sub 47/

Hydrogen dissolved in V, Nb or Ta or their solid solutions causes the C' shear modulus to decrease, whereas C/sub 44/ increases. These appear to be entirely different effects, with ..delta..C' being a result of interstitial relaxation and ..delta..C/sub 44/ arising from the electronic contribution. The apparent inverse dependence of ..delta..C', i.e., relaxation strength, on atomic volume of the alloys implies that the positive hydrostatic pressure derivative of C' should de… more

Date: January 1, 1979

Creator: Fisher, E S; Alberts, H L & Katahara, K

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Effect of implanted helium on the microstructure and creep properties of ordered (Fe/sub 0/ /sub 49/Ni/sub 0/ /sub 51/)/sub 3/V alloys

A series of long-range ordered alloys with base composition (Fe/sub 0/ /sub 49/Ni/sub 0/ /sub 51/)/sub 3/V were homogeneously injected with approx. 100 appm helium at 600/sup 0/C using the cyclotron at the Institut fuer Festkoerperforschung (IFF), KFA Juelich, West Germany. Post-implantation creep testing at 600/sup 0/C revealed that the time to rupture as well as the total creep strain was reduced drastically compared to unimplanted material. Transmission electron microscopy (TEM) revealed tha… more

Date: January 1, 1983

Creator: Sklad, P.S. & Schroeder, H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Optimization of film synthesized rare earth transition metal permanent magnet systems

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: Report

Partner: UNT Libraries Government Documents Department