Download or read book The Microstructural Evolution of Al Cu Zr Alloys During Thermomechanical Processing written by Elaine M. Cullen and published by . This book was released on 1996 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Microstructural Evolution of Al Cu Zr Alloys During Thermochemical Processing written by E. M. Cullen and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructural Evolution of an Al Cu Zr Si Alloy During Concurrent Straining and Annealing written by Douglas Brooks and published by . This book was released on 1991 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructural Evolution During Aging of an Al Cu Li Ag Mg Zr Alloy written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alloys in the Al-Cu-Li Ag-Mg subsystem were developed that exhibit desirable combinations of strength and ductility. These Weldalite (trademark) alloys, are unique for Al-Cu-Li alloys in that with or without a prior cold stretching operation, they obtain excellent strength-ductility combinations upon natural and artificial aging. This is significant because it enables complex, near-net shape products such as forgings and super plastically formed parts to be heat treated to ultra-high strengths. On the other hand, commercial extrusions, rolled plates and sheets of other Al-Cu-Li alloys are typically subjected to a cold stretching operation before artificial aging to the highest strength tempers to introduce dislocations that provide low-energy nucleation sites for strengthening precipitates such as the T(sub 1) phase. The variation in yield strength (YS) with Li content in the near-peak aged condition for these Weldalite (trademark) alloys and the associated microstructures were examined, and the results are discussed. Kumar, K. S. and Brown, S. A. and Pickens, Joseph R. Unspecified Center ...

Download or read book A Calorimetric Study of the Microstructures of a Thermomechanically Processed Al 10 0 Mg 0 1 Zr Alloy written by James N. Jr Andrews and published by . This book was released on 1986 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Differential scanning calorimetry (DSC) was used to investigate microstructure evolution in a high-magnesium aluminum-magnesium alloy, Al-10.0% Mg-0.1% Zr, which had been thermomechanically processed. The two variations of the thermomechanical processing (TMP) investigated resulted in an extremely fine grain size, one of the preconditions for superplastic deformation. The DSC results were consistent with previous research indicating continuous recrystallization occurs during annealing and deformation at relatively low temperatures. Additional insight into the development of the microstructure produced by the two TMP variations was obtained, especially with regard to the intermetallic Beta-phase. The DSC study also showed that a morphological difference exists in the microstructures produced by the two TMP variations used, and transmission electron microscopy (TEM) results confirmed these differences.

Download or read book Microstructural and Crystallographic Aspects of Recrystallization written by N. Hansen and published by . This book was released on 1995 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Aluminum written by George E. Totten and published by CRC Press. This book was released on 2003-03-27 with total page 1318 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Handbook of Aluminum: Vol. 1: Physical Metallurgy and Processes covers all aspects of the physical metallurgy, analytical techniques, and processing of aluminium, including hardening, annealing, aging, property prediction, corrosion, residual stress and distortion, welding, casting, forging, molten metal processing, machining, rolling, and extrusion. It also features an extensive, chapter-length consideration of quenching.

Download or read book Processing microstructure Relationships in Al Cu Alloys Produced by the Cold Spray Deposition Process written by Tian Liu and published by . This book was released on 2018 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigates the processing-microstructure relationships during cold spray deposition of binary aluminum-copper alloys. While cold spray has been successfully applied using a variety of engineering alloys, systematic investigations that relate powder particle microstructure to spray deposition characteristics and deposited material microstructure have not yet been performed. In this dissertation, the Al-Cu binary alloy will be used as a model system due to its well-known attributes in the physical metallurgy literature and its technological importance as the parent alloys for alloys such as AA2014, AA2024, and AA2219. First, the effect of systematic copper alloy additions (2-5wt% Cu) on the microstructure and properties of the gas atomized, feedstock powders was investigated using electron microscopy, X-ray diffraction, and nanoindentation. Second, the microstructural evolution and texture development during the cold spray process was studied using electron microscopy, and electron backscatter diffraction (EBSD). Third, the impact deformation of individual cold sprayed particles was quantified, and the deformation microstructure in the deposited particles was characterized using focused ion beam, transmission Kikuchi diffraction (TKD), and precession electron diffraction (PED). Lastly, the influence of heat treatment of the feedstock powders on the spray characteristics and microstructure of the cold sprayed material was examined using electron microscopy, and EBSD.

Download or read book Processing Microstructure and Superplasticity in Al Mg Mn Alloys written by Chris D. Meyer and published by . This book was released on 1991 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fundamentals of Aluminium Metallurgy written by Roger Lumley and published by Elsevier. This book was released on 2010-11-25 with total page 862 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminium is an important metal in manufacturing, due to its versatile properties and the many applications of both the processed metal and its alloys in different industries. Fundamentals of aluminium metallurgy provides a comprehensive overview of the production, properties and processing of aluminium, and its applications in manufacturing industries.Part one discusses different methods of producing and casting aluminium, covering areas such as casting of alloys, quality issues and specific production methods such as high-pressure diecasting. The metallurgical properties of aluminium and its alloys are reviewed in Part two, with chapters on such topics as hardening, precipitation processes and solute partitioning and clustering, as well as properties such as fracture resistance. Finally, Part three includes chapters on joining, laser sintering and other methods of processing aluminium, and its applications in particular areas of industry such as aerospace.With its distinguished editor and team of expert contributors, Fundamentals of aluminium metallurgy is a standard reference for researchers in metallurgy, as well as all those involved in the manufacture and use of aluminium products. - Provides a comprehensive overview of the production, properties and processing of aluminium, and its applications in manufacturing industries - Considers many issues of central importance in aluminium production and utilization considering quality issues and design for fatigue growth resistance - Metallurgical properties of aluminium and its alloys are further explored with particular reference to work hardening and applications of industrial alloys

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book GaN AIN InN and their Alloys Volume 831 written by Christian Wetzel and published by Cambridge University Press. This book was released on 2005-07-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses GaN and Related Alloys and reflects an emerging emphasis on the binaries of InN and AlN. The major thrust here is the topical development of thin-film growth, bulk growth techniques, methods to cover the full ternary and quaternary alloy ranges toward InN and AlN and their characterization; strategies for structural defect reduction and their characterization; ways to better control p-type doping and its characterization; device and defect physics, including polarization effects; physics of surfaces and interfaces; and device processing techniques. In addition, advances in MBE devices, high-power electronics, RF performance of electronics, UV emitters, high-efficiency light emitters, photo and chemical sensors, as well as new applications within the group-III nitrides, are also covered. The book captures the current status of this field and will be useful for researchers working with group-III nitrides, as well as for students who seek entry into this subject.

Download or read book Early Microstructural Evolution and Deformation Behavior in Solution Heat Treated Aluminum lithium Alloys written by Shelly Midori Miyasato and published by . This book was released on 1991 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermo Mechanical Modeling and Microstructural Evolution of a Cast Aluminum Alloy written by Tracy Jayne Smith and published by . This book was released on 1998 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructure Evolution and Stress Corrosion Cracking Behavior in Short term Thermomechanically Processed Al Cu Li Alloys written by Jannik Entringer and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing access to space leaves human footprints in orbits closer to the Earth. Today, space debris poses a major risk for in-service missions and on-ground casualties. Reducing the amount of debris is the only way to preserve key orbits. One strategy to avoid future debris is to maneuver spacecraft after mission into the atmosphere where the structure burns up. This strategy is taken into account at early design stages of modern spacecraft. Therefore, material choices must be made to ensure high structural demisability. Titanium, currently used in propellant tanks, is often a large portion, by mass, of the total structure and does not completely ablate during re-entry. Aluminum-copper-lithium alloys are being considered as a substitute for titanium in propellant tanks because they deliver comparable specific material properties at a higher demisability rate. Because the technology of aluminum-copper-lithium alloys in space structures is not as mature as that of titanium, new joining methods must be developed. Friction stir welding features the unique characteristic of joining in the solid state; thus, it is especially attractive for hard-to-weld alloys such as aluminum-copper-lithium. The development of space structures requires a fundamental knowledge of the material behavior, both during processing and during the subsequent exposure to the environment. In recent years, aluminum copper-lithium alloys have rarely been welded by bobbin tool friction stir welding. The underlying microstructure evolution has been described as complex, certain aspects are not fully understood and contradictory results have been reported. Current knowledge on the behavior of welded joints on this specific alloy under stress and exposed to corrosive environments is limited. Therefore, for the possible use in spacecraft structures, a scientific analysis of the stress corrosion behavior of welded joints is necessary. As part of the present work, two modern aluminum-copper lithium alloys were successfully joined by semi-stationary bobbin tool friction stir welding. Identical parameters allowed a detailed comparison of the process response. The welding process imposes a short time, thermomechanical exposure in the base material that leads to severe microstructure modification. Based on the chemical composition of the two alloys, the microstructural evolution is explained, and a precipitation sequence is proposed. Overaged strengthening precipitates and equilibrium phases of several types were identified to form during welding. These modifications led to a reduced mechanical performance of 78 % of the ultimate tensile strength. Stress corrosion analyses were performed on pre-, as- and post-welded samples and were correlated with the modified microstructure. Stress corrosion cracking phenomena were found to result from the short-time, thermomechanical effect induced by the welding process. The mechanism leading to stress corrosion lies in the modified microstructure, where coarse, precipitates accumulate at the grain boundaries. These particles are observed to promote local galvanic reactions, which promote dissolution and the consequent development of a cracking network under stress.

Download or read book Precipitate Coarsening During Overaging of 2519 Al Cu Alloy Application to Superplastic Processing written by and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overaging experiments have been conducted on a commercial grade 2519 Al-Cu alloy at a variety of temperatures and times, with and without prior induced strain. Hardness testing and scanning electron microscopy techniques were used to characterize evolution of microstructure during overaging. The further development of microstructure during thermomechanical processing by warm rolling was also assessed to determine whether the coarse particles produced by overaging could serve as sites for particle stimulated nucleation (PSN) of recrystallization. The thermomechanical processing methods have been shown to produce highly superplastic microstructures in Al-Mg and Al-Mg-Li alloys in previous work at NPS. Optical microscopy and tensile tests were conducted allowing a determination of the effect of the processing on the microstructural evolution and superplastic behavior of the Al-Cu material. Aluminum-Copper Alloys, Superplasticity, Thermomechanical Process.

Download or read book Mixed mode Model for Studying Microstructural Evolution of Precipitates Inside Aluminum Alloys written by Tohid Naseri and published by . This book was released on 2020 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminum is one of the most used non-ferrous metal in the world with an enormous range of applications from simple kitchenware to advanced spacecraft. In applications where high mechanical properties are needed, like in the car industry, it is strongly required to improve the mechanical properties. As the final distribution of precipitates plays a crucial role in mechanical properties of these alloys, a better understanding of the microstructural evolution and kinetics of precipitation can help noticeably the design of the heat treatment process of aluminum alloys. However, due to the size and morphology of the precipitates, experimental studies of the precipitation required advanced characterization methods like transmission electron microscopy which is not an industrially favorable technique since it is costly and required a lot of technical expertise. Numerical investigation can be a desirable tool to model the evolution of the precipitates and the corresponding mechanical properties. This study presents a kinetic model of precipitation. Unlike many studies that mainly focus on the diffusion and surface energy, we consider interfacial mobility as an effective variable in a mixed-mode model. This variable not only provides us the possibility to study the precipitates’ evolution in multicomponent alloys but also can boost the calculation performance. Moreover, the other superiority of this model is the possibility of working with complex multiphase industrial Al alloys by considering the growth and the dissolution of different types of precipitates simultaneously.