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Jul 16, 2015
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Schneider, A.; Stoll, E. K
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Vapor pressures of zinc over aluminum-zinc alloys of entire concentration range by method based on principle of dew-point
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Topics: ALUMINUM ALLOYS, VAPOR PRESSURE, ZINC ALLOYS, ALUMINUM ALLOY, VAPOR PRESSURE, ZINC
Topics: DTIC Archive, NATIONAL RESEARCH CORP CAMBRIDGE MA, *INTERMETALLIC COMPOUNDS, *THERMODYNAMICS,...
The objective was to determine the cause and significance of the weld radiograph enigma, which is a linear anomaly in the features of the X-ray film. By observing features on available radiographs and in studying published reports of similar features it was possible to conclude that there are many manifestations of the enigma, and that they are all specific features of fine structure in radiographs due to natural processes connected with welding and to specific X-ray absorption and diffraction...
Topics: NASA Technical Reports Server (NTRS), ALUMINUM ALLOYS, ANOMALIES, MICROSTRUCTURE, PHOTOGRAPHIC...
Corrosion of Clad 7075 aircraft alloy prompted the Air Force to sponsor an evaluation of differnt cladding compositions. The objective was to determine if these compositions offered better corrosion resistance than 7072, while providing adequate galvanic protection. Accelerated corrosion tests indicate that there are registered aluminum alloys that offer an improvement over 7072. Further work is needed to optimize a composition.
Topics: DTIC Archive, Lowe, Thomas A, KAISER ALUMINUM AND CHEMICAL CORP SPOKANE WA DEPT OF METALLURGICAL...
This is the first annual technical report of progress toward a crosstie random access memory. This marks a recent change in direction from the previously studied serial access memory. The more pertinent information learned from the serial memory approach which applies to the CRAM is repeated here. However, previous reports contain much additional important information and can be obtained by writing to the authors. It was realized at NSWC that the crosstie memory elements could be reorganized...
Topics: DTIC Archive, Schwee,Leonard J, NAVAL SURFACE WEAPONS CENTER SILVER SPRING MD, *NONVOLATILE...
The investigation combines both experimental studies and numerical modeling to predict coating life in an oxidizing environment. The experimental work provides both input to and verification of two numerical models. The coatings being examined are an aluminide coating on Udimet 700 (U-700), a low-pressure plasma spray (LPPS) Ni-18Co-17Cr-24Al-0.2Y overlay coating also on U- 700, and bulk deposits of the LPPS NiCoCrAlY coating.
Topics: NASA Technical Reports Server (NTRS), ALUMINUM ALLOYS, LIFE (DURABILITY), MATHEMATICAL MODELS,...
The invention is particularly concerned with sealing thermal barrier coating systems of the type in use and being contemplated for use in diesel and other internal combustion engines. The invention also would find application in moderately high temperature regions of gas turbine engines and any other application employing a thermal barrier coating at moderate temperatures. Ni-35Cr-6Al-1Y, Ni-35Cr-6Al-1Yb, or other metallic alloy denoted as MCrAlx is applied over a zirconia-based thermal barrier...
Topics: NASA Technical Reports Server (NTRS), CERAMICS, METAL COATINGS, PROTECTIVE COATINGS, SURFACE...
A systematic study of the effects of stress ratio on small fatigue crack growth in Ti-6Al-4V was conducted. Cylindrical fatigue specimens were tested axially at room temperature under a maximum stress of 690 MPa and with stress ratios (R) of 0.5, 0.1, and -1. Tests were periodically interrupted and a standard replication technique was used to monitor the growth of cracks artificially initiated from 30 to 40 micrometer micro-notches, which were milled into the specimen surface with a focused ion...
Topics: DTIC Archive, AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING...
Hoop-up wires are exposed to three types of fatigue: (1) vibration; (2) sharp bending during installation, modification, and servicing; and (3) intentional flexing in service. As stated, vibration is very difficult to simulate in the laboratory. The second type, sharp installation-bending, is also difficult to reproduce because each installation and each installing activity have different wiring problems and technicians servicing equipment in the field subject the wires to varying degrees of...
Topics: DTIC Archive, Alexander, Donald C, SURPRENANT MFG CO BOSTON MA, *ELECTRIC CABLES, LIFE...
With the increased use of non-metallic materials on tactical vehicles, acceptable performance of the Chemical Agent Resistant Coating (CARC) system, scheduled for full implementation in FY86, must be verified for these new substrates. The intent of this project was to test and evaluate CARC on laminate armor material under consideration for a proposed new vehicle. Because the mission requirements include transportability, agility, and survivability weight is to be minimized. This requires the...
Topics: DTIC Archive, Duncan, Jeffrey L, ARMY BELVOIR RESEARCH DEVELOPMENT AND ENGINEERING CENTER FORT...
Topics: DTIC Archive, Smith, L M, FRANKFORD ARSENAL PHILADELPHIA PA, *BEARINGS, *ALLOYS, *METALS, TENSILE...
The effect of friction-stir processing (FSP) on the microstructure of a cast nickel-aluminum bronze (NAB) material has been characterized by various micro-analytical methods including orientation imaging microscopy (OIM). Cast NAB is widely utilized in the production of propellers for the surface ships and submarines of the U.S. Navy due to excellent corrosion-resistance. New applications require improved mechanical properties that may be attainable using FSP to achieve localized microstructure...
Topics: Friction, Nickel-aluminum alloys, Microscopy, Nickel aluminum bronze, Friction stir processing,...
Topics: DTIC Archive, Burch, W L, BELL AEROSYSTEMS CO BUFFALO NY, *ALUMINUM ALLOYS, *SPOT WELDING,...
The graphs presented herein display metals fatigue information from various sources of published and unpublished test reports which have been processed and regenerated through a semi-automatic data processing system. Each graph includes a legend which identifies the material, test procedure, test conditions and the most significant test and/or material variables associated with the plotted data. The data displayed on these graphs are intended to answer very general questions and to serve as a...
Topics: DTIC Archive, BELFOUR ENGINEERING CO SUTTONS BAY MI, *ALUMINUM ALLOYS, *FATIGUE(MECHANICS),...
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This report considers as the dominating characteristic, either the load carried, the speed, the radius of action, the fuel consumption, the activity of transport, or, lastly, the qualities of comfort and safety. The first four factors determine the theoretical efficiency, while the others determine its practical efficiency.
Topics: ALUMINUM ALLOYS, SHEET - ALCOA 24ST - STRENGTH, ALUMINUM ALLOYS, SHEET - ALCLAD 75ST - STRENGTH,...
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Convertino, Victor A
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During exercise, increased capillary hydrostatic pressure caused by elevation of arterial pressure produces plasma volume shifts from the vascular space to the interstitial fluids. Following a rapid efflux of vascular fluid within minutes of exercise, there is very little further reduction in plasma volume during long-term exercise, suggesting protective mechanisms against loss of circulating blood volume. These mechanisms probably include increasing plasma protein oncotic pressure, differences...
Topics: HAFNIUM, SINGLE CRYSTALS, HEAT TREATMENT, RUPTURING, LIFE (DURABILITY), CHEMICAL ANALYSIS,...
Topics: DTIC Archive, Ailes, Herbert B, OWENS-CORNING FIBERGLAS CORP ASHTON RI, *COMPOSITE MATERIALS,...
Differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) were used to establish the microstructural effects of various multistage aging treatments on aluminum alloy 7075. DSC was used to characterize the matrix microstructure while TEM was used to characterize the grain boundary precipitates. The aging treatments were in five categories: isochronal pre- aging, isothermal pre-aging, final again at 150 C , commercial type two-stage aging treatments, and retrogression and...
Topics: DTIC Archive, Papazian, John M, GRUMMAN AEROSPACE CORP BETHPAGE NY RESEARCH DEPT, *MICROSTRUCTURE,...
We have fabricated 2-3 nm radius aluminum nanoparticles as evidenced by distinct Coulomb Blockade steps in the linear conductance. We have fit these Coulomb Blockade steps to a theoretical model based on the Orthodox Theory of single electron tunneling in order to determine the size and junction characteristics of these nanoparticles. Using the same fabrication technique, we have produced 2-3 nm radius 0.01% iron in copper nanoparticles. By investigating these dilute magnetic alloy...
Topics: DTIC Archive, Sohn, Lydia L, PRINCETON UNIV NJ DEPT OF PHYSICS, *ELECTRON TRANSPORT,...
The use of severe plastic deformation techniques such as equal channel angular pressing, has been shown to refine metal microstructures giving advantageous mechanical properties. Metals and alloys subjected to ECAP procedures can have very high yield strengths while maintaining substantial ductility, a unique and attractive combination. However, the implicitly large deformations (the application of repeated shear strains of 1 are typical) make prediction of the resulting mechanical properties...
Topics: DTIC Archive, Vogel, S G, LOS ALAMOS NATIONAL LAB NM, *PLASTIC DEFORMATION, *NEUTRON DIFFRACTION,...
The objective of this research was to further develop two models that are capable of predicting crack growth in ductile materials. In this study, we measured CTOA (crack tip opening angle) at elevated temperatures for a stainless steel and aluminum alloy 2014-T6. The CTOA curves were then used as the fracture criterion to simulate crack extension and instability in thin-walled cylinders subjected to localized intense heat. The commercial finite element code ABAQUS was used in conjunction with a...
Topics: DTIC Archive, Sun, C T, PURDUE UNIV LAFAYETTE IN, *FINITE ELEMENT ANALYSIS, *STEEL,...
The Air Force requires the development of an environmentally compliant chromate-free aircraft coating system that meets or exceeds current corrosion protection capabilities. A number of non-chromated pretreatments and primers have been independently developed over the past years. This report compares the corrosion resistance performance of selected fully non-chromate systems to the standard chromate containing coating system. The data identified two non-chromated systems that performed...
Topics: DTIC Archive, Voevodin, N, DAYTON UNIV OH RESEARCH INST, *ALUMINUM ALLOYS, *CHROMATES, *CORROSION...
Titanium is a candidate as a structural material for all new tactical and armored ground vehicles, because of its high strength-to-weight ratio, excellent corrosion resistance, and inherent ballistic resistance. However, titanium as a structural material is much less mature than both steel and aluminum alloys, especially in the area of joining. While welding is the typical joining method for titanium, vacuum brazing is an option in areas that are difficult to access for welding as well as areas...
Topics: DTIC Archive, Doherty, Kevin J, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS...
This report presents results of quasi-static compression tests of 2024-T3510 and 6061-T6 aluminum alloy rods performed at 22 C. The yield strengths, Poisson's ratios and Young's moduli are reported. An analysis of the variation of Poisson's ratio with strain, based on classical plasticity assumption, is presented and compared with the tests. In light of these test results, the necessity for a reinterpretation of the compressibility of metals accompanying plastic flow is demonstrated.
Topics: DTIC Archive, Benck, Ralph F, Filbey, Jr , Gordon L, Murray, Jr, E A, ARMY BALLISTIC RESEARCH LAB...
The Australian Army S-7OA-9 Black Hawk fleet is experiencing numerous occurrences of cracking in an internal fuselage panel. The panel is not primary structure, but it is essential. Cracking has occurred only on the right hand side panel, and the standard repair scheme is inadequate. In October 1994, the Australian Army approached DSTO and the Royal Australian Air Force (RAAF) Aircraft Research and Development Unit (ARDU) for assistance in determining the cause of the cracking. To try to...
Topics: DTIC Archive, Lombardo, D C, DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA),...
The deleterious effects of fretting on the fatigue properties of a material have been known since the work of Warlow-Davies in 1941. However, a widely accepted fretting fatigue life prediction method still does not exist and debates persist as to what the critical parameter(s) for fretting fatigue are. This work demonstrates that the surface stresses due to contact can be used to characterize the damaging effects of fretting on the fatigue properties of a material. The elastic stress analysis...
Topics: DTIC Archive, Kirkpatrick, Gary W, MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MATERIALS SCIENCE...
Topics: DTIC Archive, Humphries, T S, NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HUNTSVILLE AL GEORGE C...
Ultrasonic fatigue (20kHz) has been used to investigate the role of microstructural variability on fatigue life variability for very long fatigue lives, between 10(to the 7th power) and 10(to the 9th power) cycles, in structural aerospace materials. This AFOSR program has been augmented by support from DARPA (Dr. Leo Christodoulou) and a summary of the results from the combined support is described in this report. Four distinctly different structural alloys have been studied: (1) a particle...
Topics: DTIC Archive, Jones, J W, MICHIGAN UNIV ANN ARBOR DEPT OF MATERIALS SCIENCE AND ENGINEERING,...
Boron nitride nanotubes have been proposed as a suitable reinforcement for metal matrix composites. In order to be effective, the interaction between the metal and the nanotube needs to be strong while retaining the nanotube structure. This project involves the use of computational quantum chemistry to study interactions of aluminium \201Al\202 and titanium \201Ti\202 metal clusters with boron nitride nanotubes \201BNNT\202. First-principles density-functional theory plus dispersion...
Topics: DTIC Archive, QUEENSLAND UNIV BRISBANE (AUSTRALIA), *BORON NITRIDES, *METAL MATRIX COMPOSITES,...
A three-phase program was completed to develop reliable, high temperature dynamic strain gage systems for application to turbine engine components operating to 1500 F. The strain gage element, intermediate leads and gage fabrication processes that evolved are used over the full temperature range: however, two different application techniques are required to achieve maximum fatigue strength to 1500 F. A composite-ceramic application design is recommended to 700 F. At higher temperatures, the...
Topics: DTIC Archive, Weise,R A, GENERAL ELECTRIC CO CINCINNATI OH AIRCRAFT ENGINE BUSINESS GROUP, *GAS...
An interdisciplinary program on the use of ion implantation for materials processing is being conducted at NRL. This report describes the important factors in ion implantation science and technology and reports progress in the use of ion implantation to modify friction, wear, fatigue, corrosion, and optical properties of materials. (Author)
Topics: DTIC Archive, Smidt,F A, NAVAL RESEARCH LAB WASHINGTON DC, *ION IMPLANTATION, *RESEARCH MANAGEMENT,...
This volume presents the most comprehensively compiled experimental data and the critically evaluated and recommended values for the thermal radiative properties (hemispherical, normal, angular) spectral emittance, reflectance, absorptance, and transmittance of twenty-seven selected aircraft/ spacecraft structural materials of technological interest. Each subproperty is treated with respect to both wavelength and temperature dependences whenever possible. In the compilation of experimental...
Topics: DTIC Archive, Touloukian, Y S, THERMOPHYSICAL AND ELECTRONIC PROPERTIES INFORMATION ANALYSIS CENTER...
Fatigue crack growth rate testing was performed on powder-metallurgy (PM) produced aluminum 7090 and 7091. Forms examined for each alloy were plate, extrusions, and hand forgings. Crack growth properties for each material were evaluated using both a fighter aircraft-type spectrum (FALSTAFF) and a transport-type aircraft spectrum (Mini-TWIST). All results are compared to ingot-metallurgy (IM) produced aluminum 7050-T76 plate. Results under spectrum loading conditions indicate the PM 7091 alloys...
Topics: DTIC Archive, Ruschau, John J., DAYTON UNIV OH RESEARCH INST, *CRACKING(FRACTURING),...
The reaction of lithium aluminum alloy with water at high temperature is considered in terms of phase equilibria in the system Li-A1-0-H. A thermodynamic analysis of the system reveals the potential importance of lithium hydride as a reaction product. Major needs for experimental phase equilibria data are outlined, and a determination of the Li20-A1203 phase diagram is given top priority. Experimental methods for preparation and handling of atmospherically sensitive Li20/A1203 mixtures are...
Topics: DTIC Archive, Cook,L P, NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD INORGANIC MATERIALS DIV,...
An experimental investigation was conducted to determine the static and dynamic responses of a specific stiffened flat plate design. The air-backed rectangular flat plates of 6061-T6 aluminum with an externally machine longitudinal narrow-flanged T-stiffener and clamped boundary conditions were subjected to static loading by water hydropump pressure and shock loading from and eight pound TNT charge detonated underwater. The dynamic test plate was instrumented to measure transient strains and...
Topics: DTIC Archive, Budweg,Howard L, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *STRUCTURAL RESPONSE, *METAL...
The boron, aluminum composite material samples were cut to shape and subjected to push-pull type of loading under Instron Servo Hydrolic test system to failure. The failure surfaces were examined under electron microscope. The data collected under about ten experiments were used for an M.S.E. thesis of one graduate student. Keywords: Fracture failure of composite materials; Boron Fiber metal Matrix composite Material; Fatigue Failure.
Topics: DTIC Archive, Rao,R N, PRAIRIE VIEW A AND M UNIV TX COLL OF ENGINEERING, *FIBER REINFORCED...
Axial fatigue testing has shown that ARALL laminates possess outstanding fatigue resistance compared to monolithic aluminum alloys in tension-dominated cyclic loads. This work examines the fatigue behavior of 3/2 and 5/4 ply ARRALL-4 in pure flexure (R=-1). The effect of salt-fog exposure on fatigue response was also investigated. Results indicate that, in general, failure occurs in three stages: cracking of the outer aluminum surfaces, delamination at the interfaces between fiber-rich and...
Topics: DTIC Archive, Cook, Jeffrey, NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW...
The proposed program sought to study and characterize the mechanical response, fracture, failure modes of certain ceramics, cermets, and related composites under ultrahigh loading rates, and to relate the overall material properties to the microstructure, and, hence, to the associated processing techniques. Concomitant with this experimental effort, it was proposed to seek to determine the feasibility of developing a metal-ceramic structure which could be self-healing when subjected to certain...
Topics: DTIC Archive, Nemat-Nasser, S, CALIFORNIA UNIV SAN DIEGO LA JOLLA, *CERAMIC MATERIALS, *CERMETS,...
The effects of variations in thermomechanical processing (TMP) parameters on grain refinement in 2519 A1-Cu alloy were studied. Refined grains enhance tensile ductility and are a prerequisite for superplastic response. The TMP variables were adjusted based on panicle stimulated nucleation (PSN) theory. Process modifications included increased initial overaging time and decreased subsequent warm rolling temperatures. Backscatter orientation-contrast (BSOC) techniques for the scanning electron...
Topics: DTIC Archive, Dunlap, Jeffrey R, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *THERMOMECHANICS, *PARTICLE...
The goal of this program was to determine the effect of plastic media blasting (PMB), an alternative to chemical paint removal, on the fatigue life of 2024-T3 aluminum. Two surface treatments, anodized and alclad, of three thicknesses: 0.032 inch, 0.040 inch, and 0.050 inch were considered. A number of alclad and anodized aluminum panels of the alloy and thicknesses specified were subjected to four cycles of PMB. The blast parameters were identical to those used in a previous FAA program. Almen...
Topics: DTIC Archive, GALAXY SCIENTIFIC CORP EGG HARBOR TOWNSHIP NJ, *REMOVAL, *FATIGUE LIFE, *ALUMINUM...
Residual stresses arising from the lamination fabrication process are investigated using linear laminate theory. An equation to predict the residual stresses is given. The pertinent variables that influence residual stresses are identified. Several composite systems with various ply layup configurations are examined. Results are presented to illustrate the dependence of the residual stresses on the pertinent variables. The residual stresses are very sensitive to constituent material properties,...
Topics: DTIC Archive, Chamis, Christos C., NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS...
This report results from a contract tasking Tula State Technical University as follows: Investigate the development of oxide/silicide wear resistant coatings produced by microarc discharge oxidation (MDO) on the surface of aluminum and magnesium based alloys.
Topics: DTIC Archive, Lyubimov, Victor, TULA STATE TECHNICAL UNIV (RUSSIA) ELECTROPHYSICAL AND...
A method for the preparation of fine powders for microscopic examination of their cross section is described. Heavily worked nickel-coated aluminum powders were mounted in epoxy and polished to a mirror finish to allow for the characterization of their interior structure. The method presented would be applicable to all types of finely divided media.
Topics: DTIC Archive, Dewing, George T, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *POWDERS, *ALUMINUM,...
Continuously-cast AA5083 in the form of as-cast billets 15 mm in thickness condition was subjected to friction stir processing (FSP) by five overlapping passes. The FSP utilized a tool having a pin approximately 5 mm in length, so that the process zone had a depth that was approximately one-third of the billet thickness. The solidification microstructure of the as-cast material included grains that were approximately 60 m in size as well as non-equilibrium distributions of the Al8Mg5 and Al6Mn...
Topics: DTIC Archive, Bland, Marc T, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *ALUMINUM ALLOYS,...
The variation in component damage tolerance life is assessed in terms of the variation in crack growth rate using a cycle by cycle integration technique. The results of a fatigue crack growth rate interlaboratory study are reanalyzed in order to predict the life of a component-like structure. It was determined that the variability in crack growth rate is fundamentally the same as the variability in the predicted fracture mechanics life for 4130 steel, and the aluminum alloys 2024-T351 and...
Topics: DTIC Archive, Rosenberger, A H, AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND...
Infected passengers can unintentionally contaminate the interior of aircraft; deliberate biological contamination from criminals and international adversaries is also possible. Previous work has provided information regarding the delivery mechanism and capability of STERIS Corporation's Vaporized Hydrogen Peroxide (VHP*) technology as a decontaminant/disinfectant/sanitizer for transportation vehicles like aircraft, buses, subway trains, ambulances, etc. The present report documents a materials...
Topics: DTIC Archive, AUBURN UNIV AL NATIONAL AIR TRANSPORTATION CENTER OF EXCELLENCE FOR RESEARCH IN THE...
This thesis investigated the evolution of oxide particles caused by friction stir welding of oxide dispersion strengthened steel, MA956. Eight welding conditions were used of different rotation and traverse rates, resulting in a range of heat inputs affecting weld quality. Raman spectroscopy was used to identify and map the distribution of yttrium-aluminum oxide particles in cross sections of the welds. Electron microscopy and energy dispersive X-ray spectroscopy provided additional information...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *ALUMINUM ALLOYS, *OXIDES, *RAMAN...
Fastener holes represent one of the most common fatigue details found in airframe structures. In order to minimize the impact fastener holes have on the fatigue behavior of critical aircraft components, many are processed by cold expansion. Cold expansion imposes a residual compressive stress field around a hole that retards fatigue crack growth from the volume of cold working and increases the fatigue life of the component. According to the current United States Air Force s guiding documents...
Topics: DTIC Archive, UTAH UNIV SALT LAKE CITY DEPT OF MECHANICAL ENGINEERING, *AIRCRAFT DESIGN, *ALUMINUM...
A total of 16 test methods and associated target property values were selected and devised for determining the mechanical, physical, and handling characteristics of a 350 degree F service core splice adhesive. These were coordinated with knowledgeable people in the industry and subsequently used in the screening and characterization of various formulations. Approximately 90 materials were compounded by the formulator, of which 16 were screened for expansion ratio, slump, peak exotherm, volatile...
Topics: DTIC Archive, Mahoney, J W, Crilly, E R, ROCKWELL INTERNATIONAL LOS ANGELES CA LOS ANGELES AIRCRAFT...
Microstructures and mechanical properties resulting from thermomechanical processing of high-Magnesium (Mg) content Aluminum-Magnesium (Al-Mg) alloys were investigated in this research. Warm rolling processes, intended to refine both grain size and second phase Al3Mg2 (beta) particle size, were conducted for alloy compositions of 10.2 weight % Mg, 10.2 weight % Mg plus 0.5 weight % copper (Cu) and 12.1 weight % Mg. Solution treatment, hot upset forging, resolutioning and rapid cooling provided...
Topics: DTIC Archive, Speed,William Goodwin, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *THERMOMECHANICS,...
