Download or read book Response of 7075 and 7050 Aluminium Alloys to High Temperature Pre precipitation Heat Treatment written by Olayinka Tehinse and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Al-Zn-Mg-Cu (7xxx series) aluminium alloys are widely used for aircraft structures. It is difficult to obtain a combination of optimal strength and stress corrosion cracking (SCC) resistance for these alloys. It appears that SCC resistance of these alloys is related to grain boundary precipitate morphology. One technique to control the grain boundary precipitate morphology is to introduce a controlled cooling procedure referred to as High Temperature Pre-precipitation (HTPP) treatment following the solution heat treatment. There is need for a detailed study of the effect of HTPP on the properties of commercial Al-Zn-Mg-Cu alloys using different intermediate temperatures. In this thesis research, the results of ten HTPP processes applied to 7075 and 7050 commercial 7xxx series alloys are presented in terms of hardness, electrical conductivity, corrosion resistance, TEM analysis of grain boundary precipitate morphology and EDS analysis of solute concentration profile at the grain boundary. Results indicate that subsequent to HTPP processing, the 7050 alloy can be precipitation aged to a higher hardness compared to 7075; this result is associated with the modification of 7050 alloy by zirconium versus chromium in 7075 alloy. HTPP heat treatment achieves better SCC resistance compared to standard T6 temper. However, it does not appear that HTPP can achieve a combination of hardness, electrical conductivity and corrosion resistance superior to standard T6 and T7X tempers.
Download or read book Study of Heat Treatment Aging Process Parameters for 7050 and 7075 Aluminum Alloys written by Ambarneil Roy and published by . This book was released on 2020 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Light Metals 2019 written by Corleen Chesonis and published by Springer. This book was released on 2019-03-09 with total page 1665 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Light Metals symposia at the TMS Annual Meeting & Exhibition present the most recent developments, discoveries, and practices in primary aluminum science and technology. The annual Light Metals volume has become the definitive reference in the field of aluminum production and related light metal technologies. The 2019 collection includes papers from the following symposia: 1. Alumina and Bauxite 2. Aluminum Alloys, Processing, and Characterization 3. Aluminum Reduction Technology 4. Cast Shop Technology 5. Cast Shop Technology: Energy Joint Session 6. DGM-TMS Symposium on Lightweight Metals 7. Electrode Technology for Aluminum Production 8. REWAS 2019: Cast Shop Recycling Technologies 9. Scandium Extraction and Use in Aluminum Alloys 10. Ultrasonic Processing of Liquid and Solidifying Alloys
Download or read book Alloying written by Joseph R. Davis and published by ASM International. This book was released on 2001-01-01 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alloying: Understanding the Basics is a comprehensive guide to the influence of alloy additions on mechanical properties, physical properties, corrosion and chemical behavior, and processing and manufacturing characteristics. The coverage considers "alloying" to include any addition of an element or compound that interacts with a base metal to influence properties. Thus, the book addresses the beneficial effects of major alloy additions, inoculants, dopants, grain refiners, and other elements that have been deliberately added to improve performance, as well the detrimental effects of minor elements or residual (tramp) elements included in charge materials or that result from improper melting or refining techniques. The content is presented in a concise, user-friendly format. Numerous figures and tables are provided. The coverage has been weighted to provided the most detailed information on the most industrially important materials.
Download or read book Aluminum written by John E. Hatch and published by ASM International. This book was released on 1984-01-01 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive information for the American aluminium industry Collective effort of 53 recognized experts on aluminium and aluminium alloys Joint venture by world renowned authorities-the Aluminium Association Inc. and American Society for Metals. The completely updated source of information on aluminium industry as a whole rather than its individual contributors. this book is an opportunity to gain from The knowledge of the experts working for prestigious companies such as Alcoa, Reynolds Metals Co., Alcan International Ltd., Kaiser Aluminium & Chemical Corp., Martin Marietta Laboratories and Anaconda Aluminium Co. It took four years of diligent work to complete this comprehensive successor to the classic volume, Aluminium, published by ASM in 1967. Contents: Properties of Pure Aluminum Constitution of Alloys Microstructure of Alloys Work Hardening Recovery, Recrystalization and Growth Metallurgy of Heat Treatment and General Principles of Precipitation Hardening Effects of Alloying Elements and Impurities on Properties Corrosion Behaviour Properties of Commercial Casting Alloys Properties of Commercial Wrought Alloys Aluminum Powder and Powder Metallurgy Products.
Download or read book On the Response of 7000 Series Alloys to Hot Stamping written by Kaab Omer and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Hot stamping, or die quenching (DQ), of 7000-series aluminum alloys is a metal forming process in which a blank is heated (solutionized) and then quenched and formed in cold tooling. The formed part is then subjected to an artificial aging treatment to reach a targeted final strength (temper). The work presented herein addresses several aspects of the die quenching process chain for two 7000-series aluminum sheet alloys, AA7075 and a developmental alloy referred to as AA7xxx. The thesis addresses: (i) identification of forming process and artificial aging parameters needed to achieve high strength structural properties within an automotive die quenching paradigm; (ii) characterization of high temperature constitutive and heat transfer properties required to accurately simulate the die quenching process; and (iii) development of a model of the work hardening response of die quenched AA7075 as a function of the extent of artificial aging. The effect of the solutionizing duration, the transfer time between the furnace and die, and the in- die quench rate on the subsequent aging response were examined for both alloys. Experiments revealed that both alloys require a solutionizing time of 8 min at 470 °C. For AA7075, a transfer time of up to 6 s (furnace to die) was deemed to be acceptable since this time duration does not appear to result in premature precipitation. For AA7xxx, a transfer time of up to 15 s is acceptable. AA7075 required a minimum quench rate of 56 °C/s, whereas AA7xxx requires only 27 °C/s. Variations in aging treatments following die quenching were also considered in order to obtain desirable yield and ultimate tensile strength properties while accounting for the paint bake cycle (PBC) and its effect on artificial aging response. It was determined that AA7075 could achieve strength properties similar to those a T6 temper if it was aged for 8h at 121 °C followed by a PBC (30 min at 177 °C). AA7xxx could achieve T6-like properties if aged for 3h at 100 °C followed by a PBC and T76-like properties if aged for 4h at 100 °C, followed by a PBC. A detailed characterization of the constitutive behaviour and heat transfer characteristics of these alloys under DQ conditions was performed. Of particular note, this characterization was performed at elevated temperatures while the material was in a solutionized condition. The acquired properties consisted of: (i) the temperature and strain rate dependent stress-strain properties; (ii) the yield surface, and (iii) the heat transfer coefficient (HTC) of both alloys. The stress-strain properties were obtained by subjecting tensile specimens to a temperature-time cycle resembling the DQ process. A novel technique was devised in which the cross-sectional area of the tensile specimens were measured using stereoscopic digital image correlation (DIC) technique. A Barlat Yld2000 yield surface was calibrated using anisotropic properties obtained from shear and tensile tests. The HTC was obtained as a function of contact pressure by performing a series of instrumented quenching experiments in which the temperatures of the blank and die were measured as a function of time. These temperature-time curves were processed using Fourier's law and Newton's cooling law to calculate HTC. The acquired elevated temperature constitutive properties and heat transfer coefficients were input to a finite element model of die quenched deep drawn cups. The load-displacement and earring profile results from the experiments were shown to match well with the predicted results from the model. The final step in the DQ process chain was also considered in terms of the final or in-service mechanical properties of die quenched and artificially aged components. A micro-mechanics based model was developed to predict the stress-strain response and work hardening rate of AA7075 as a function of the aging treatment applied. The micromechanics model accounts for precipitate-dislocation interaction during deformation following aging and was validated for a range of multi-step aging treatments. Tensile tests were performed considering tempers ranging from as-quenched up to the peak aged condition, and the model was shown to accurately predict flow stress over the entire range of aging treatments considered.
Download or read book Aluminum and Aluminum Alloys written by Joseph R. Davis and published by ASM International. This book was released on 1993-01-01 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt: This one-stop reference is a tremendous value and time saver for engineers, designers and researchers. Emerging technologies, including aluminum metal-matrix composites, are combined with all the essential aluminum information from the ASM Handbook series (with updated statistical information).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Corrosion of Aluminum and Aluminum Alloys written by Joseph R. Davis and published by ASM International. This book was released on 1999-01-01 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heat Treatment Studies of Aluminium Alloy Type 7050 Forgings Interim Report No 1 written by L. Schra and published by . This book was released on 1974 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Microstructure and Plane Strain Fracture Toughness of High Strength Aluminum Alloys written by Peter John Guest and published by . This book was released on 1967 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Extrusion of Aluminium Alloys written by T. Sheppard and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years the importance of extruded alloys has increased due to the decline in copper extrusion, increased use in structural applications, environmental impact and reduced energy consumption. There have also been huge technical advances. This text provides comprehensive coverage of the metallurgical, mathematical and practical features of the process.
Download or read book Age hardenable Aluminium Alloys written by István Kovács and published by . This book was released on 1987 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents more than 60 papers on various topics of current interest, concerning the development of new types of alloys, trace elements, analytical techniques, the physics of the decomposition process, dislocation structure and technological applications.
Download or read book Stress corrosion Cracking of Aluminum Alloys written by F. H. Haynie and published by . This book was released on 1966 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report deals with the stress-corrosion cracking of aluminum alloys, and it represents an effort by DMIC to expand on the information contained in DMIC Memorandum 202, 'Stress-Corrosion Cracking of Aluminum Alloys', dated February 15, 1965. DMIC Report 228 begins by presenting a comprehensive definition of stress-corrosion cracking. This is followed by sections dealing with (1) the historical development and growth in awareness of the problem, (2) the mechanisms involved, and (3) the theory of stress-corrosion cracking. A section on experimental techniques is presented. These techniques include test methods used to determine the susceptibility of alloys to stress-corrosion cracking, as well as more refined methods of studying the fundamental mechanisms of the problem. Different evaluation methods, applicable to obtaining the different objectives of stress-corrosion testing, are also presented. All of the foregoing serve as background to the sections on stress-corrosion-cracking behavior of aluminum alloys and preventive measures. (Author).
Download or read book Thermomechanical Processing of Aluminum Alloys written by James G. Morris and published by . This book was released on 1979 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Retrogression reaging and Hot Forming of AA7075 written by Thomas Alexander Ivanoff and published by . This book was released on 2014 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: The retrogression-reaging (RRA) and hot forming behavior of AA7075 were studied. AA7075 is a high-strength alloy used in applications where weight is of particular importance, such as in automobiles. Like many of the high-strength aluminum alloys, AA7075 requires elevated temperature forming to achieve ductility comparable to steels at room temperature. Since AA7075 is a precipitation hardening alloy, heat treatments during forming and production need to be closely controlled to limit any loss of strength due to changes in the microstructure. Two new forming concepts are introduced to explore the feasibility of forming AA7075 in manners compatible with current automotive manufacturing processes. They are RRA forming and solution forming. These concepts seek to improve upon the room-temperature formability of AA7075-T6 and incorporate the paint-bake cycle (PBC) into the heat treatment process. The PBC is a mandatory heat treatment used to cure the paint applied to automobiles during production. Currently, the PBC is conducted at 180 °C for 30 minutes. RRA behavior was studied with molten salt bath treatments between 200 and 350 °C. The PBC was used in lieu of the standard 24 hour reaging treatment conducted at 121 °C. It was determined that retrogression treating below 250 °C was acceptable for RRA forming, with retrogressing at 200 °C producing the hardest material after reaging by the PBC. The formability of AA7075-T6 during RRA forming was evaluated by tensile testing at 200 and 225 °C. Ductility of AA7075-T6 at RRA forming temperatures was double compared to those produced at room temperature. RRA forming was demonstrated to achieve this improved ductility and a final material hardness after the PBC of only slightly less than the peak-aged condition. In addition, solution forming behavior was studied at 480 °C. Solution forming can increase ductility compared to RRA forming, but it requires aging at 121 °C prior to the PBC to produce peak-aged hardness.
Download or read book Heat Treating and Surface Engineering written by ASM Heat Treating Society. Conference and Exposition and published by ASM International. This book was released on 2003-01-01 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
