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Advanced Aluminum Lithium Base Alloys Produced By Rapid Solidification From The Melt
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Book Synopsis Advanced Aluminum-Lithium Base Alloys Produced by Rapid Solidification from the Melt by : Nicholas J. Grant
Download or read book Advanced Aluminum-Lithium Base Alloys Produced by Rapid Solidification from the Melt written by Nicholas J. Grant and published by . This book was released on 1983 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three research tasks were supported to varying degrees under this program and contract support. One of them was fairly well advanced on termination of the contract one year after its initiation. This work was continued and has resulted in a paper entitled 'Lithium-Containing 2024 Aluminum Alloys Made from Rapidly Solidified Powders, ' by W. Wang and N.J. Grant. The paper was presented at the Second International Conference on Al-Li Alloys held at Monterey, Calif. in April 1983. A second study, entitled 'Structure-Property Relationships of Rapidly Solidified Al-Mg-Li Alloys' by W. Wang and N.J. Grant, was also initiated under this contract, but was far from being completed within the one-year span. Nevertheless, since the research was started under the DARPA (ARO) contract, the very interesting results of the research are summarized in this final report. A third study, which was initially started as an ONR (DARPA) program, was an analytical study which took about four years to complete. Based on the content of this study and its initiation under DARPA support, the program was continued as part of this effort. The study was recently completed under other funding. This study was entitled 'Notched Tensile Properties of Rapidly Solidified and Ingot-Based Aluminum Alloys' by S. Kang and N.J. Grant. The paper was presented at the Rapid Solidification Conference at NBS, held in Dec. 1982.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aluminum-Lithium Alloys by : Olga Grushko
Download or read book Aluminum-Lithium Alloys written by Olga Grushko and published by CRC Press. This book was released on 2016-11-18 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminum–Lithium Alloys: Process Metallurgy, Physical Metallurgy, and Welding provides theoretical foundations of the technological processes for melting, casting, forming, heat treatment, and welding of Al–Li alloys. It contains a critical survey of the research in the field and presents data on commercial Al–Li alloys, their phase composition, microstructure, and heat treatment of the ingots, sheets, forgings, and welds of Al–Li alloys. It details oxidation kinetics, protective alloying, hydrogen in Al–Li alloys, and crack susceptibility. It also discusses grain structure and solidification, as well as structural and mechanical properties. The book is illustrated with examples of Al–Li alloy applications in aircraft structures. Based on the vast experience of the coauthors, the book presents recommendations on solving practical problems involved with melting and casting ingots, welding of Al–Li alloys, and producing massive stampings for welded products. Provides comprehensive coverage of Al–Li alloys, not available in any single source. Presents research that is at the basis of the production technology for of ingots and products made of Al–Li alloys. Combines basic science with applied research, including upscaling and industrial implementation. Covers welding of Al–Li alloys in detail. Discusses gas and alkali-earth impurities in Al–Li alloys. Describes technological recommendations on casting and deformation of Al–Li alloys.
Book Synopsis Aluminum-Lithium Alloys by : Vijaya Singh
Download or read book Aluminum-Lithium Alloys written by Vijaya Singh and published by Elsevier Inc. Chapters. This book was released on 2013-09-20 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Information on the technology of melting and casting aluminium lithium alloys is rarely published. Therefore, this chapter presents important findings from many research investigations on various aspects of melting, casting and cast structure development of Al-Li alloys. Presence of reactive element such as Li in the molten alloy requires special melt protection techniques, containment materials, alloying practices and casting equipment. Problem of grain refinement, linked to the presence of Zr in most commercial compositions, has also been discussed. Finally, it is surmised that the lower Li contents present in the third generation alloys compared to their older counterparts is expected to ease difficulties in their melting and casting.
Book Synopsis Rapid Solidification of an Aluminum-lithium Alloy for Solid Freeform Fabrication Applications by : David Heard
Download or read book Rapid Solidification of an Aluminum-lithium Alloy for Solid Freeform Fabrication Applications written by David Heard and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The solidification behavior of an Aluminum-Lithium-Copper (Al-Li-Cu) alloy, AA2199, and the microstructural morphology and solute distributions resulting from three rapid solidification processing techniques were investigated. Controlled-Short-Circuiting Metal-Inert-Gas (CSC-MIG) welding, Laser Re-melting (LRM), and Electrospark Deposition (ESD) were investigated. The morphology of the rapidly solidified material was then compared with the Kurz-Giovanola-Trivedi (KGT) model for microstructural development during rapid solidification, to allow for the estimation of the solidification front velocity (SFV) realized during processing. This SFV was then compared with that required for non-equilibrium solute partitioning as predicted by the Continuous Growth Model (CGM) of Aziz. The solute distributions where then measured and compared with that expected for equilibrium and non-equilibrium partitioning, to determine if the solute trapping phenomenon had been induced during solidification. The CSC-MIG deposited material displayed a fine (4.3 ±1 [micrometer]) cellular structure, comparable to that reported for electron beam welding. The SFV was estimated to be ~2-4.5x10-4m/s, a value below that required to impart any deviation from equilibrium partitioning. Chemical analysis via Energy Dispersive Spectroscopy (EDS) and Time-Of-Flight Secondary-Ion-Mass-Spectroscopy (TOF-SIMS) revealed lateral segregation of copper to the cell walls, and a similar segregation profile to that predicted by the Clyne-Kurz model. TOF-SIMS also revealed a homogeneous lateral lithium distribution, while depth profiling displayed some lithium enrichment at the surface.Within the LRM material it was determined that laser pulse energies on the order of 0.25-0.5 Joules resulted in a fine cellular solidification structure. The SFV was estimated to be between 3 and 25cm/s were realized during solidification. Furthermore, a pulse energy of 0.125J resulted in a featureless solidification structure. The SFV for the samples produced with a pulse energy of 0.125J was estimated to be >1m/s. The CGM predicted a deviation from equilibrium partitioning all pulse energy levels employed. This was supported by the chemical profiling of lithium within the re-melted samples measured via X-ray photoelectron spectroscopy (XPS). Measurement of the lattice parameter via X-ray diffraction (XRD) revealed that the solute trapping phenomenon resulted in the formation of a super saturated solid solution, evident through a reduction of the lattice parameter from 4.0485 Å for the starting material to 4.0399 Å in the LRM material produced with a pulse energy of 0.125 Joules. The analysis of the ESD solidified material revealed the breakdown of a planar solid-liquid interface into a cellular morphology, resulting in fine copper rich cells within the microstructure (~30-60nm in width). The KGT model predicted this occurred at a SFV of ~1m/s. The CGM predicted significant trapping of Li at a SFV of 1m/s, which was supported by the TOF-SIMS data, which revealed a homogeneous distribution of lithium within the solidified material. Finally Atom-Probe-Tomography revealed the presence of Al3Li upon the cell walls. It was then determined that the Al3Li was not formed during the solidification process, as predicted by a time dependent nucleation model for phase suppression during rapid solidification, and the result of subsequent aging. It was also revealed that the T1 hardness of the LRM material is similar to that of the T3 BM. It was therefore concluded that the LRM process is capable of producing SFF components of AA2199, which can achieve adequate hardness via a natural aging process, without requiring cold-working prior to aging. Finally the LRM solidified material in the T5 condition was determined to be capable of aging to 81% of the hardness (~122HV) of the BM in the T8' condition, without the application of a cold working process prior to aging." --
Book Synopsis Aluminum-Lithium Alloys by : N Eswara Prasad
Download or read book Aluminum-Lithium Alloys written by N Eswara Prasad and published by Butterworth-Heinemann. This book was released on 2013-09-20 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because lithium is the least dense elemental metal, materials scientists and engineers have been working for decades to develop a commercially viable aluminum-lithium (Al-Li) alloy that would be even lighter and stiffer than other aluminum alloys. The first two generations of Al-Li alloys tended to suffer from several problems, including poor ductility and fracture toughness; unreliable properties, fatigue and fracture resistance; and unreliable corrosion resistance. Now, new third generation Al-Li alloys with significantly reduced lithium content and other improvements are promising a revival for Al-Li applications in modern aircraft and aerospace vehicles. Over the last few years, these newer Al-Li alloys have attracted increasing global interest for widespread applications in the aerospace industry largely because of soaring fuel costs and the development of a new generation of civil and military aircraft. This contributed book, featuring many of the top researchers in the field, is the first up-to-date international reference for Al-Li material research, alloy development, structural design and aerospace systems engineering. Provides a complete treatment of the new generation of low-density AL-Li alloys, including microstructure, mechanical behavoir, processing and applications Covers the history of earlier generation AL-Li alloys, their basic problems, why they were never widely used, and why the new third generation Al-Li alloys could eventually replace not only traditional aluminum alloys but more expensive composite materials Contains two full chapters devoted to applications in the aircraft and aerospace fields, where the lighter, stronger Al-Li alloys mean better performing, more fuel-efficient aircraft
Book Synopsis Advanced Powder Metallurgy Aluminum Alloys Via Rapid Solidification Technology by :
Download or read book Advanced Powder Metallurgy Aluminum Alloys Via Rapid Solidification Technology written by and published by . This book was released on 1984 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rapid Solidification and Subsequent Analysis of Some Hypereutectic Aluminum-Based Alloys by : RD. Field
Download or read book Rapid Solidification and Subsequent Analysis of Some Hypereutectic Aluminum-Based Alloys written by RD. Field and published by . This book was released on 1986 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: A number of hypereutectic aluminum-based alloys have been prepared using rapid solidification processing. Two types of studies have been made, each involving a different set of alloy compositions. The first experiment was concerned with determination of the change in microstructural morphology of rapidly solidified Al-Ni alloys as a function of solute concentration. The results obtained for both laser surface melting and melt spinning were essentially identical in that there is a marked variation in microstructure for nickel concentrations in the range of 4.5 to 8.0% (atomic percent). The occurrence of these various microstructural morphologies has been interpreted on the basis of local interface undercooling and an asymmetrically disposed region of coupled growth. The second experimental approach involved a comparison of the responses of Al-4.1Fe-0.6X (indicated in atomic percent), where X was either molybdenum or cerium. The microstructure of the rapidly solidified molybdenum-containing alloy was found to be identical to that of the binary Al-4.7Fe and consisted of a cellular morphology with randomly distributed refined intercellular particles. The cerium-containing alloy also exhibited a cellular morphology, but the intercellular regions seemed to contain two phases, the first being the same as that found in the binary and molybdenum-containing alloys and the second tentatively identified as an oxide based on cerium. The microstructural changes and hardness variations have been determined as a function of aging at temperatures up to 773 K.
Download or read book CAB written by and published by . This book was released on 1983 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Powder Metallurgy Aluminum Alloys Via Rapid Solidification Technology, Phase 2 by :
Download or read book Advanced Powder Metallurgy Aluminum Alloys Via Rapid Solidification Technology, Phase 2 written by and published by . This book was released on 1987 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Keikinzoku Shogakukai. Research Group for Rapid Solidification of Aluminum Alloys Publisher : ISBN 13 : Total Pages :0 pages Book Rating :4.:/5 (113 download)
Book Synopsis Report of the Research Group for Rapid Solidification of Aluminum Alloys by : Keikinzoku Shogakukai. Research Group for Rapid Solidification of Aluminum Alloys
Download or read book Report of the Research Group for Rapid Solidification of Aluminum Alloys written by Keikinzoku Shogakukai. Research Group for Rapid Solidification of Aluminum Alloys and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1994 with total page 1584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aluminum-lithium Alloys by : T. H. Sanders
Download or read book Aluminum-lithium Alloys written by T. H. Sanders and published by . This book was released on 1989 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Alloy Chemistry on Superplastic Forming of Rapid-Solidification-Processed Aluminum-Lithium Alloys by : RJ. Lederich
Download or read book Effects of Alloy Chemistry on Superplastic Forming of Rapid-Solidification-Processed Aluminum-Lithium Alloys written by RJ. Lederich and published by . This book was released on 1986 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The superplastic forming characteristics of rapid-solidification-processed (RSP) Al-3Li-based alloys containing varying amounts of copper, magnesium, cobalt, and zirconium and processed by different thermomechanical sequences were investigated. Their final microstructures were strongly dependent on the processing treatment and alloy composition. All the zirconium-containing alloys were processed to have a fine subgrain microstructure. These alloys deform predominantly by dislocation glide and climb processes and by subgrain boundary motion, and they exhibit up to 400% elongation, which is sufficient for many commercial forming applications. Cavitation was suppressed, and the mechanical properties were not affected by forming. A thermomechanical processing sequence was established that develops a completely recrystallized fine grain microstructure in the Al-Li-Cu-Zr alloys. The alloys with this recrystallized microstructure have excellent formability.
Book Synopsis Advanced Aluminium and Magnesium Alloys by : Tasadduq Khan
Download or read book Advanced Aluminium and Magnesium Alloys written by Tasadduq Khan and published by . This book was released on 1990 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Review: Chill-Block Melt Spin Technique, Theories & Applications by : Mustafa Kamal
Download or read book A Review: Chill-Block Melt Spin Technique, Theories & Applications written by Mustafa Kamal and published by Bentham Science Publishers. This book was released on 2013-03-15 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid Solidification Processing of molten metals and alloys has proved to be a reliable route for producing new and advanced materials. The Chill-Block Melt Spin (CBMS) technique is important because its simplicity, flexibility and perfection. High quality materials can be produced with lower costs, as compared to other routes, by refining the microstructure and trapping the nucleated (new) metastable phases. Melt-spun ribbons subsequently produced can then be consolidated to produce billets and sheets that can be used in many industries especially high-tech industries such as aerospace and racing automobiles. This book contains several perspectives about CBMS technology and should be a useful review for undergraduate and post-graduate metallurgy students.
Download or read book Advanced Materials written by and published by . This book was released on 1994 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
