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Review of x-ray diffraction studies in uranium alloys

Description: Results of x-ray diffraction experiments investigating equilibrium structures of uranium-base substitutional alloys and routes of transitions between equilibrium structures are critically reviewed. Data on equilibrium alpha, beta, and gamma alloys are presented together with a resume of work on the crystal structures of relevant stable intermetallic compounds. The second part of the review is principally concerned with x-ray diffraction studies of metastable phases: their structure and their mo… more
Date: January 1, 1973
Creator: Yakel, H.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Free-energy approach to computing dynamic phase change in materials

Description: The free energy approach to calculating dynamic phase change is described. It is assumed that the driving force for the transition is the difference in the Gibbs free energy for the phases present in the material. To demonstrate the validity of the theory, the model is applied to delta -phase plutonium. (auth)
Date: November 28, 1973
Creator: Kamegai, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Recent observations of phase transformations in a U--Nb--Zr alloy

Description: Dilatometry, x-ray diffraction, hardness, and optical microscopy were used to characterize polycrystalline U--7.5% Nb--2.5% Zr. Upon quenching this alloy from the bcc phase at 800 deg C, a metastable modification corresponding to a slight tetragonal distortion of the bcc lattice along with a short-range atom displacement ordering was revealed by x-ray diffraction. Minor compositional variations, differing quenching rates, and low temperature aging cause important alterations in this metastable … more
Date: January 1, 1973
Creator: Vandermeer, R.A.
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Partner: UNT Libraries Government Documents Department
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Magnetic field of the 30-inch hydrogen bubble chamber at NAL: report on results of fringe-field measurements and central-field measurements

Description: During the period from December 19, 1972 to January 7, 1973 an extensive program of measurements of the fringe field of the 30-inch HBC magnet at NAL was carried out. Measurements of two components of the field were made at approximately 1900 points in the fringe field down-stream from the bubble chamber at each of two magnet currents (nominal currents were 18,000 and 16,000 amps). An additional 800 measurements were made to determine the effects on the field of iron phototube shields used with… more
Date: July 1, 1973
Creator: Shephard, W.D.; Bishop, J.M.; Fokitis, E. & U., /Notre Dame
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Microscopic theory for the fluctuation-driven phase transition in weak itinerant magnets

Description: From 19th conference on magnetism and magnetic materials; Boston, Massachusetts, USA (13 Nov 1973). The microscopic basis for a recent phenomenological theory -for the thermodynamics near T/sub c/ of weak itinerant magnets is presented. Calculation of dynamic renormalization effects within paramagnon theory justifies the previous assumption of weakly temperature dependent Ginsburg- Landau alpha and BETA coefficients. The cutoff on the fluctuation phase space is found to go as q/sub m/= ~ (T/sub… more
Date: October 1, 1973
Creator: Murata, K. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Elastic and plastic deformation of solids. Annual progress report, February 1, 1973--January 31, 1974

Description: The 0 deg C freezing point of mercury determination based on the combined length and ultrasonic time pressure gage was completed and published. The transformation pressure obtained is P/sub T/ - 7571.2, 1.6 bars. The maximum deviation of the manganin gage from linearity is -11.6 plus or minus 0.1 bars at P/sub T/2/. A method of machining meter-long LiF single crystals was developed, and combined length and ultrasonic measurements on such a crystal are underway to determine second-pressure deriv… more
Date: October 22, 1973
Creator: Ruoff, A. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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