L. J. Nowicki

Argonne National Laboratory

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S. J. Rothman

Technical University of Denmark

H M Chung

Nuclear Energy Agency

Dale Smith

University of Melbourne

W. K. Kwok

Argonne National Laboratory

N.Q. Lam

Argonne National Laboratory

B.A. Loomis

Argonne National Laboratory

D L Smith

Cabot (United States)

A. P. Paulikas

Argonne National Laboratory

A. P. Paulikas

Argonne National Laboratory

B. W. Veal

Argonne National Laboratory

Cooperative Institutions

Argonne National Laboratory

University of Illinois Chicago

University of Illinois Urbana-Champaign

Los Alamos National Laboratory

University of California, San Diego

Northwestern University

Northern Illinois University

Brookhaven National Laboratory

United States Department of Energy

American Ceramic Society

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Papers

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Effects of proton bombardment on self-diffusion in silver: A preliminary report

Thin Solid Films (1975)

N.Q. Lam S. J. Rothman K. L. Merkle L. J. Nowicki D. Dever

Self-diffusion

10.1016/0040-6090(75)90252-7

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Citations (14)

Tensile properties of vanadium alloys irradiated at 200{degrees}C in the HFIR

H M Chung L. J. Nowicki D L Smith

Vanadium alloys were irradiated in a helium environment to {approx}10 dpa at {approx}200{degrees}C in the High Flux Isotope Reactor (HFIR). This report presents results of postirradiation tests of tensile properties of laboratory heats of V-(1-18)Ti, V-4Cr-4Ti, V-8Cr-6Ti, V-9Cr-5Ti, V-3Ti-1Si, and V-3Ti-0.1C alloys. Because of significant loss of work-hardening capability, all alloys except V-18Ti exhibited a very low uniform plastic strain <1%. For V-Ti. The mechanism of the loss of work-hardening capability in the other alloys is not understood.

Hardening (computing)

Strain hardening exponent

10.2172/543195

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The possible occurrence of multi-phase behavior in the high T(sub c) superconductor YBa2Cu3O(sub x)

Mark A. Beno L. Soderholm D. W. Capone D. G. Hinks J. D. Jorgensen

Source

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Raman scattering from high-Tcsuperconductors

Physical review. B, Condensed matter (1988)

R. Bhadra T. O. Brun Mark A. Beno B. Da̧browski D. G. Hinks

Raman scattering experiments from high-${T}_{c}$ superconductors of the R${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{d}}$ type, with R=Y, Pr, Nd, Eu, Gd, Dy, and Yb, are reported. Because of the great difficulty in obtaining single-phase samples, spectra from all starting compounds and other known phases of Y-Ba-Cu are presented. This systematic approach has allowed the identification of the lines observed in Raman spectra of the superconducting compounds as well as those of impurity phases. The lines originating from the superconducting yttrium compound were investigated as a function of quench temperature, and oxygen deficiency. Polarization studies on single crystals are also presented.

10.1103/physrevb.37.5142

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Citations (72)

The chemical diffusion of Ta in γ-U in samples fabricated for positron studies

Journal of Nuclear Materials (1982)

S. J. Rothman L. J. Nowicki M. J. Fluss L.C. Smedskjaer G. L. Fogle

Allotropy

10.1016/0022-3115(82)90407-x

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Citations (2)

Tensile properties of V-(4-5)Cr-(4-5)Ti alloys

H M Chung L. J. Nowicki D.E. Busch Dale Smith

The current focus of the U.S program of research on V-base alloys is on V-(4-5)Cr(4-5)Ti that contains 500-1000 wppm Si. in this paper, we present experimental results on baseline tensile properties of two laboratory-scale heats of this alloy and of a 500-kg production heat of V-4Cr-4Ti (heat 832665) that were measured at 23-700 C. Both the production- and laboratory scale heats of the reference alloy V-4Cr-4Ti exhibited excellent tensile properties at temperatures up to {approx}650{degrees}C.

Base (topology)

10.2172/270417

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Subtask 12D1: Impact properties of production heat of V-4Cr-4Ti

H M Chung L. J. Nowicki Dale Smith

Following previous reports of excellent properties of a laboratory heat of V-4Cr-4Ti, the alloy identified as the primary vanadium-based candidate for application as fusion reactor structural components, a large production-scale (500-kg) heat of the alloy was fabricated successfully. Since impact toughness has been known to be most sensitive to alloy composition and microstructure, impact testing of the production-scale heat was conducted in this work between -200{degrees}C and +200{degrees}C. A 500-kg heat of V-4Cr-4Ti, an alloy identified previously as the primary vanadium-based candidate alloy for application as fusion reactor structural components, has been produced successfully. Impact tests were conducted at -196{degrees}C to 150{degrees}C on 1/3-size Charpy specimens of the scale-up heat in as-rolled condition and after annealing for 1 h at 950, 1000, and 1050{degrees}C in high-quality vacuum. The annealed material remained ductile at all test temperatures; the ductile-brittle transition temperature (DBTT) was lower than -200{degrees}C. The upper-shelf energy of the production-scale heat was similar to that of the laboratory-scale ({approx}30-kg) heat of V-4Cr-4Ti investigated previously. Effect of annealing temperature was not significant; however, annealing at 1000{degrees}C for 1 h not only produces best impact properties but also ensures a sufficient tolerance to effect of temperature inhomogeneity expected when annealing large components. Effect of notch geometry was also investigated on the production heat. When annealed properly (e.g., at 1000{degrees}C for 1 h), impact properties were not sensitive to notch geometry (45{degrees}-notch, root radius 0.25 mm; and 300-notch, root radius 0.08 mm). 11 refs., 6 figs., 1 tab.

Charpy impact test

10.2172/415177

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Ductile-brittle transition behavior of V-4Cr-4Ti irradiated in the dynamic helium charging experiment

H M Chung L. J. Nowicki D.E. Busch

The objective of this work is to determine the effect of simultaneous displacement damage and dynamically charged helium on the ductile-brittle transition behavior of V-4Cr-4Ti specimens irradiated to 18-31 dpa at 425-600{degrees}C in the Dynamic Helium Charging Experiment (DHCE).

Brittleness

10.2172/115709

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Half-lives of nine radioisotopes

Physical Review C (1974)

S. J. Rothman N.L. Peterson W. K. Chen J. Hines R. Bastar

We have determined the half-lives of nuclides $^{28}\mathrm{Mg}$, $^{52}\mathrm{Fe}$, $^{55}\mathrm{Co}$, $^{57}\mathrm{Ni}$, $^{67}\mathrm{Cu}$, $^{69}\mathrm{Zn}^{m}$, $^{112}\mathrm{Pd}$, $^{105}\mathrm{Ag}$, and $^{111}\mathrm{Ag}$. The decay was followed for more than 10 half-lives in most cases. The long duration of the measurements, the stability of the counting equipment, and computer programs that allowed least-squares fitting to the sum of several exponentials yielded highly accurate values of the half-lives.[RADIOACTIVITY $^{28}\mathrm{Mg}$, $^{52}\mathrm{Fe}$, $^{55}\mathrm{Co}$, $^{57}\mathrm{Ni}$, $^{67}\mathrm{Cu}$, $^{69}\mathrm{Zn}^{m}$, $^{112}\mathrm{Pd}$, $^{105}\mathrm{Ag}$, $^{111}\mathrm{Ag}$; measured ${T}_{\frac{1}{2}}$.]

Nuclide

10.1103/physrevc.9.2272

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Citations (38)

Positron-annihilation studies of the superconductivity transition in YBa_{2}Cu_{3}O_{7-x}

Physical review. B, Condensed matter (1988)

L.C. Smedskjaer B. W. Veal D. Legnini A. P. Paulikas L. J. Nowicki

Positron-annihilation studies, by Doppler broadening, of the superconducting transition in ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{x}}$(x\ensuremath{\approxeq}0.1) have been made. Below ${T}_{c}$ a large positive temperature dependence of the lineshape parameter is observed, while at (or near) ${T}_{c}$ an almost discontinuous increase in the lineshape parameter takes place. The behavior below ${T}_{c}$ may be consistent with a Bardeen-Cooper-Schrieffer-like theory if an energy band with a small dispersion crosses the Fermi level. The discontinuity is not clearly understood, but may be due to a major change in the electronic structure taking place with the onset of superconductivity.

Annihilation

Cooper pair

BCS theory

Superconducting transition temperature

Transition temperature

10.1103/physrevb.37.2330

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Citations (44)