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Study of Aluminum Deformation by Electron Microscopy

Description: Note presenting an investigation of the slip-line structure in a series of aluminum single crystals deformed in tension in an electron microscope. In several of the crystals, the slip-line structure was examined after successive steps in the elongation.
Date: August 1956
Creator: Young, A. P.; Melton, C. W. & Schwartz, C. M.
Partner: UNT Libraries Government Documents Department

The Preparation of Aluminium Nitrate from Hydrated Aluminum Oxides

Description: This report discusses methods of producing aluminum nitrate for the Redox process. Large amounts of aluminum nitrate are consumed during the Redox process, so this report explores preparation of this material through the dissolution of hydrated aluminum oxide in nitric acid.
Date: October 5, 1949
Creator: Harmon, M. K.
Partner: UNT Libraries Government Documents Department

Creep of 2S-O Aluminum Sheet at 500 and 550 C

Description: Abstract: "Creep and creep-rupture tests were made on 25-O aluminum sheet at temperatures of 500 and 550 C. The estimated stresses that will produce 0.5 per cent deformation and rupture in 10,000 hours at 400, 450, 500, and 550 C (data at 400 and 450 C are from BMI-T-29, dated June 9, 1950) are presented."
Date: September 11, 1952
Creator: VanEcho, J. A.; Simmons, W. F. & Cross, H. C.
Partner: UNT Libraries Government Documents Department

Final Report: Wetted Cathodes for Low-Temperature Aluminum Smelting

Description: A low-temperature aluminum smelting process being developed differs from the Hall-Heroult process in several significant ways. The low-temperature process employs a more acidic electrolyte than cryolite, an alumina slurry, oxygen-generating metal anodes, and vertically suspended electrodes. Wetted and drained vertical cathodes are crucial to the new process. Such cathodes represent a significant portion of the capital costs projected for the new technology. Athough studies exist of wetted cathode technology with Hall-Heoult cells, the differences make such a study desirable with the new process. This project is such a study. In Phase 1, titanium diboride, zirconium diboride and composites of these with other materials were tested using a statistically useful test matrix. The materials were consolidated both by hot pressing and by a new method, plasma pressure compaction (P2C�). The materials were subject to controlled electrolysis tests under conditions of the low-temperature smelting process. Post-electrolysis characterizations included quantitative atomic analyses and electron microscopic examinations. These methods allowed evaluating the relative merits of the materials, and the mechanisms of their corrosion. Also, a few tests were performed to determine whether oxygen and carbon dioxide bathing vertically suspended cathodes exhibited different current efficiencies. In Phase 2, additional composite materials were fabricated with P2C�, electrolysis tested, and subsequently characterized. The statistical test matrix was not used in this Phase. However, the materials were tested with electrolysis lasting both five and twenty hours. The project demonstrated that good current efficiencies are obtained with the new process at this scale. All of the materials tested except for aluminum infiltrated aluminum nitride wetted well and gave comparable electrolysis voltages. Both hot pressing and P2C� produce grain structures in the consolidated materials. Grain loss to the product metal is the dominant corrosion mechanism of these materials as cathodes. Grain loss is more of a problem with the composites ...
Date: September 30, 2002
Creator: Brown, Craig W.
Partner: UNT Libraries Government Documents Department

Melting Aluminum Chips

Description: Report concerning the loss of aluminum experienced during the melting process. This report shows the magnitude of the loss through various experiments. Index begins on page 85.
Date: 1916
Creator: Gillett, H. W. & James, G. M.
Partner: UNT Libraries Government Documents Department

Gurevich Magnetomorphic Oscillations in Single Crystals of Aluminum at Helium Temperatures

Description: The Sondheimer theory was tested by looking for oscillatory phenomena in a group of single crystals representing a range in dimensions from matchbox geometry to thin-film geometry. The single crystals were identical with respect to impurity content, strain, orientation, surface condition, and probe placement.
Date: August 1967
Creator: Mollenkopf, Howard Charles
Partner: UNT Libraries

An Exploration of the Longitudinal Tensile and Compressive Properties Throughout an Extruded Shape of 24S-T Aluminum Alloy

Description: Note presenting an investigation of tensile and compressive properties of specimens cut from an extruded shape of 24S-T aluminum alloy. The tensile strengths, tensile yield strengths, elongations, and compressive yield strengths of both the uncrystallized and recrystallized portions were determined. The strength of a cross section of an extruded shape is the weighted average of the strengths of the unrecrystallized and the recrystallized areas.
Date: December 1942
Creator: Paul, D. A.
Partner: UNT Libraries Government Documents Department

Nondestructive Test Methods for Spot Welds in Aluminum Alloys

Description: Note presenting the results of a study and research investigation of nondestructive test methods for spot welds in aluminum-alloy sheets. The purpose of the research was to investigate proposed nondestructive test methods for spot welds in aluminum alloys, to determine the feasibility of the tests, and to recommend the research methods found suitable for development and reduction to practical application.
Date: November 1944
Creator: McMaster, R. C.; Manildi, J. F. & Woolsey, C. C.
Partner: UNT Libraries Government Documents Department

Procedure Used at Aluminum Research Laboratories for Determining Type of Attack in Some Aluminum Alloys

Description: Report presenting samples of 17S-T and 24S-T aluminum alloys subjected to accelerated corrosion tests in which the corrosion period was established at 6 hours for samples that had been etched to produce a uniform surface. The results indicate the types of corrosion attack, which are described in standard terminology, and may form a basis for estimating the resistance of the material to corrosion by a comparison of the relative depth and frequency of the corrosive attacks.
Date: August 1942
Creator: Walton, C. J. & Keller, F.
Partner: UNT Libraries Government Documents Department

Internal-Friction Study of Aluminum Alloy Containing 4 Weight Percent Copper

Description: Note presenting a study of aluminum alloy containing 4 weight percent copper during aging using low-frequency internal-friction measurements in torsional and flexural vibration. Both polycrystalline and single-crystal specimens exhibit an initial internal-friction peak at 173 degrees Celsius after solution treatment and quenching.
Date: August 1958
Creator: Berry, B. S. & Nowick, A. S.
Partner: UNT Libraries Government Documents Department

Biaxial Fatigue Strength of 24S-T Aluminum Alloy

Description: Note presenting an investigation to determine the fatigue-strength values for 24S-T aluminum alloy when subjected to various ratios of biaxial stresses. The stresses considered were both tensile. The results indicated that uniaxial fatigue-strength values in the longitudinal direction cannot be used to predict the fatigue strength, and that biaxial fatigue strength may be as low as 50 percent of the uniaxial fatigue strength.
Date: May 1949
Creator: Marin, Joseph & Shelson, William
Partner: UNT Libraries Government Documents Department

Biaxial Plastic Stress-Strain Relations for 24S-T Aluminum Alloy

Description: Note presenting an investigation to determine the yield strength, ultimate strength, ductility, and plastic stress-stain relations for 24S-T aluminum alloy when subjected to biaxial stresses. The data were interpreted by a generalized St. Venant theory in an attempt to predict the biaxial stress-strain relations in terms of the uniaxial tensile stress-strain relations. Stress-strain data were also obtained from flat control specimens cut from tubular specimens and compared with tension test data obtained from tubular specimens.
Date: May 1948
Creator: Marin, Joseph; Faupel, J. H.; Dutton, V. L. & Brossman, M. W.
Partner: UNT Libraries Government Documents Department

Intergranular Corrosion of High-Purity Aluminum in Hydrochloric Acid 1: Effects of Heat Treatment, Iron Content, and Acid Composition

Description: Note presenting an investigation of the intergranular corrosion of high-purity aluminum in hydrochloric acid studied as a function of iron content, heat treatment, and acid composition under conditions where the rate of intergranular penetration was of the order of 1 millimeter per week.
Date: February 1955
Creator: Metzger, M. & Intrater, J.
Partner: UNT Libraries Government Documents Department

Interface Thermal Conductance of Twenty-Seven Riveted Aircraft Joints

Description: Note presenting testing of twenty-seven structural joint specimens of 2024-T3 and 2024-T4 aluminum alloy consisting of a T-stringer riveted to a 10- by 10-inch skin surface under simulated aerodynamic heating with no external loading applied. Rivet size and pitch were found to influence the conductance but the rivet materials tested had no observable effect.
Date: July 1957
Creator: Barzelay, Martin E. & Holloway, George F.
Partner: UNT Libraries Government Documents Department

Investigation of the Validity of an Ideal Theory of Elasto-Plasticity for Wrought Aluminum Alloys

Description: Note presenting an investigation to determine the relation between stresses and plastic strains of wrought aluminum alloys for three types of loading: tension, compression, and torsion. A secondary objective was to identify which assumptions of an ideal theory of elasto-plasticity are invalid for the alloys. Universal stress-strain curves as predicted by the theory were not obtained with wrought aluminum alloys.
Date: July 1948
Creator: Thomsen, E. G.; Cornet, I.; Lotze, I. & Dorn, J. E.
Partner: UNT Libraries Government Documents Department

Comparison of Fatigue Strengths of Bare and Alclad 24S-T3 Aluminum-Alloy Sheet Specimens Tested at 12 and 1000 Cycles Per Minute

Description: Note presenting the results of axial fatigue tests conducted on 0.032-inch-thick flat-sheet specimens of bare and alclad 24S-T3 aluminum alloy to determine the effect of frequency of loading on the fatigue strengths of these materials. The number of cycles to failure varied from about 150 to over 10,000,000 and tests were conducted using completely reversed axial load at two frequencies of loading.
Date: December 1950
Creator: Smith, Frank C.; Brueggeman, William C. & Harwell, Richard H.
Partner: UNT Libraries Government Documents Department

The Shear of Aluminum Alloy Driven Rivets as Affected by Increasing D/T Ratios

Description: "A decrease in shear strengths for increasing D/t ratios was shown in a previous investigation of protruding-head aluminum alloy rivets in double shear conducted at Aluminum Research Laboratories in 1942. Since single shear joints are more common than double shear joints, it was desirable to extend the investigation to single shear joints. This reports describes the results of this investigation of single shear joints and also includes the results of the previous investigation on double shear joints" (p. 1).
Date: July 1944
Creator: Hartman, E. C. & Wescoat, C.
Partner: UNT Libraries Government Documents Department

A Study of Slip Formation in Polycrystalline Aluminum

Description: Note presenting experimental results that shed light on the assumptions that have been made in several attempts to bridge the gap between physical and mathematical theories of plasticity. The experimental results are compatible with, but do not verify, the conception that plastic deformation in strain-hardening materials is primarily due to slip. Results regarding the mechanism of plastic deformation, development of slip in a polycrystal, number of slip systems in operation, and equality of stresses or strains in all grains are provided.
Date: December 1951
Creator: Johnson, Aldie E., Jr. & Batdorf, S. B.
Partner: UNT Libraries Government Documents Department