Download or read book Superplastic Forming of 8091 Aluminum Lithium written by C. E. Antone and published by . This book was released on 1988 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminum-Lithium alloys have been introduced to the Aerospace community as a way to decrease weight and improve stiffness over conventional aluminum alloys for structural components. A manufacturing method which as created a great deal of interest for A1-Li aerospace applications is the fabrication of net shape parts by superplastic forming (SPF). Aluminum-Lithium alloys present some unique handling problems and fabrication challenges for established practices in superplastic forming. This paper will discuss the manufacturing challenges and approaches of forming 8091 AL-Li by SPF and provide a brief overview into the material characteristic which make 8091 a successful candidate for SPF aircraft parts. Keywords: Superplastic forming (SPF); Aluminum lithium (AL-Li); Advanced aluminum; Aluminum alloys. (KT).
Download or read book Aluminum Lithium Alloys written by S. Balasivanandha Prabu and published by Elsevier Inc. Chapters. This book was released on 2013-09-20 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the late 1950s, lithium is being used as an alloying element in aluminum. Their excellent ductility, which allows superplastic forming, along with their ability to decrease the density, makes aluminum-lithium alloys a primary choice for many structural applications in aerospace industry. This chapter initially discusses the processes and mechanisms that give rise to significant plasticity/Superplasticity in these alloy systems. The superplastic behavior of Al-Li alloys and their applications in forming are then discussed. The thickness variation during superplastic forming strongly depends on the peak strain rate sensitivity index (m) of the material, and an increase in the m value reduces the thickness variation in the formed component. The factors that help increase the value of m are enumerated. Superplastic forming is carried out at temperatures ≥ 0.5 Tm (Tm is the absolute melting temperature), often closer to 0.7 − 0.8 Tm. Significant cavitation and grain growth are present at such high temperatures. This has ushered in low temperature superplastic forming by the production of ultra-fine grain sizes via dispersion strengthening and severe plastic deformation (SPD). The promise of superplastic forming of Al-Li alloys for the future and the factors including cost that limit the use of Al-Li alloys are also discussed.
Download or read book Aluminum lithium written by American Society for Metals and published by . This book was released on 1986 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superplastic Forming an Aluminium lithium Alloy AA8090 written by Ana Sofia Climaco Monteiro D'Oliveira and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aluminum lithium Alloys written by Ramesh J. Kar and published by . This book was released on 1988 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling of Superplastic Forming in Aluminum lithium Sheet written by Richard Karl Rouillard and published by . This book was released on 1995 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superplasticity and Superplastic Forming written by C. Howard Hamilton and published by . This book was released on 1988 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superplastic Forming Adhesive Bonding of Aluminum Spf Ab Multi Sheet Structures written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A significant fraction of airframe structure consists of stiffened panels that are costly and difficult to fabricate. This program explored a potentially lower-cost processing route for producing such panels. The alternative process sought to apply concurrent superplastic forming and adhesive bonding of aluminum alloy sheets. Processing conditions were chosen to balance adequate superplasticity of the alloy with thermal stability of the adhesive. As a first objective, an air-quenchable, superplastic aluminum-lithium alloy and a low-volatile content, low-viscosity adhesive with compatible forming/curing cycles were identified. A four-sheet forming pack was assembled which consisted of a welded two-sheet core separated from the face sheets by a layer of adhesive. Despite some preliminary success, of over 30 forming trials none was completely successful. The main problem was inadequate superplasticity in the heat-affected zones of the rib welds, which generally fractured prior to completion of the forming cycle. The welds are a necessary component in producing internal ribs by the 'four-sheet' process. Other challenges, such as surface preparation and adhesive bonding, were adequately solved. But without the larger issue of tearing at the weld locations, complex panel fabrication by SPF/AB does not appear viable. Wagner, John A. (Technical Monitor) and Will, Jeff D. and Cotton, James D. Langley Research Center NASA/CR-2003-212400, NAS 1.26:212400
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
Download or read book Superplasticity and Superplastic Forming II written by Amit Kumar Ghosh and published by Minerals, Metals, & Materials Society. This book was released on 1995 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of superplasticity and superplastic forming (SPF) has been increasing steadily over the past 15 years. This volume examines the current state of the technology with a focus on technological applications of superplastic forming and the mechanistic behaviour of superplastic materials.
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1989 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superplastic Formed Aluminum Lithium Aircraft Structures written by C. E. Anton and published by . This book was released on 1990 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This final report contains the results of Phase II of this two phase program which is primarily concerned with technology demonstration. The report begins with the submission of three advanced SPF designs; a floor support beam, keelson shear panel and a forward fuselage bulkhead. A detailed Weight and Life Cycle cost (LCC) trade study was done on each of these. The LCC study showed a cost savings of $14.8 million for the floor support beam, a $5.01 million savings for the keelson shear panel and a $7.8 million cost increase for the forward bulkhead (this was attributed to design complexity). The weight savings study showed a weight savings for the floor support beam and keelson shear panel (7.05 lbs and 2.57 lbs) and a weight penalty of 3.85 lbs for the forward bulkhead. The durability and damage tolerance analysis of the floor support beam resulted in a durability life of 63,650 cycles and a damage tolerant life of 34,000 cycles. Strength data results from the solution heat treatment optimization confirmed that longer solution heat treatment intervals did not increase the strength properties of the 8091 A1-Li material. (js).
Download or read book Structure Property Correlations in Al Li Alloy Integrally Stiffened Extrusions written by Stephen J. Hales and published by DIANE Publishing. This book was released on 2001 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1990 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Encyclopedia of Aluminum and Its Alloys Two Volume Set Print written by George E. Totten and published by CRC Press. This book was released on 2018-12-07 with total page 2957 pages. Available in PDF, EPUB and Kindle. Book excerpt: This encyclopedia, written by authoritative experts under the guidance of an international panel of key researchers from academia, national laboratories, and industry, is a comprehensive reference covering all major aspects of metallurgical science and engineering of aluminum and its alloys. Topics covered include extractive metallurgy, powder metallurgy (including processing), physical metallurgy, production engineering, corrosion engineering, thermal processing (processes such as metalworking and welding, heat treatment, rolling, casting, hot and cold forming), surface engineering and structure such as crystallography and metallography.
Download or read book Tech Notes written by and published by . This book was released on 1990 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
