Download or read book Evaluation of the Superplastic Potential in Commercial Aluminum Alloys Through Equal channel Angular Pressing written by Sungwon Lee and published by . This book was released on 2000 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Developing a Superplastic Forming Capability in a Commercial Aluminum Alloy Without Scandium Or Zirconium Additions written by and published by . This book was released on 2002 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests were undertaken to determine the feasibility of producing a superplastic forming capability in a commercial Al-2024 alloy through processing by equal-channel angular pressing (ECAP), where this alloy was selected because it contains no scandium or zirconium additions that are generally beneficial in retaining an array of small grains. Processing by ECAP produced grain sizes in the range from 0.3 to 0.5 micronmeter and static annealing showed these ultrafine grains were reasonably stable at temperatures up to 700 K. Superplastic elongations were achieved after ECAP with a maximum elongation of 500% at 673 K when using a strain rate of 1.0 x l0(exp -2) s(exp-1) The strain rate sensitivity was measured as 0.3 suggesting that dislocation glide is the rate-controlling mechanism. These results demonstrate the potential for achieving high tensile ductilities in conventional commercial aluminum alloys through processing by ECAP.
Download or read book Low Temperature Superplasticity in Aluminum Alloys Processed by Equal Channel Angular Pressing written by and published by . This book was released on 2002 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Equal-channel angular pressing (ECAP) was applied to achieve grain refinement of Al-3 mass%Mg alloys containing 0.2 mass%Sc. 0.2 mass%Fe or 0.1 mass%Zn The thermal stability of the fine-grained structures was examined by conducting static annealing experiments. The fine grain sizes produced by ECAP were essentially retained up to a temperature of 523K for the Fe-containing and Zr-containing alloys and up to a temperature as high as 773 K for the Sc-containing alloy. The three alloys with Sc. Fe and Zr additions were pulled to failure in tension at 523 K corresponding to 0.59Tm. where Tm is the absolute melting point of the alloy, and maximum elongations of 640%, 370% and 390% were obtained at an initial strain rate of 3.3 x l0-4 s-1 respectively. Such elongations resulted in more than three times or approximately twice the elongation achieved in a binary Al-3%M alloy. It is shown that either Fe or Zr may be used as an alternative element in place of Sc to attain low temperature superplasticity. Tensile testing was also conducted on the Sc-containing ternary alloy at a temperature as low as 473K corresponding to O.54Tm. A maximum elongation of 420% was attained at an initial strain rate of 3.3 % l0-4 s-1. This appears to be the lowest homologous temperature reported to date for superplasticity of Al-based alloys.
Download or read book Developing a High Strain Rate Superplastic Forming Capability in Aluminum Alloys written by and published by . This book was released on 2003 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The applications for superplastic forming (SPF) are currently limited because the strain rates involved in the forming process tend to be relatively slow (typically 10(exp -3)-10 (exp -1) 1 s(exp -1). There would be a very significant increase in the applications for SPF if the forming rates were increased to 10(exp -1) 1 s(exp -1). It can be shown on theoretical grounds that SPF-may be achieved at faster rates by reducing the grain size of the superplastic material. Unfortunately, it is generally not possible to achieve grain sizes as small as the submicrometer level using conventional thermo-mechanical processing. This paper demonstrates the potential for achieving ultrafine grain sizes through the application of severe plastic deformation. It is shown that two aluminum- based alloys exhibit superplastic elongations at very rapid strain rates when the alloys are processed using the procedure of Equal-Channel Angular Pressing (ECAP) in which the samples are pressed through a die containing a channel bent into an L-shaped configuration. It is demonstrated also that samples processed by ECAP can be Superplastically formed at very rapid strain rates.
Download or read book Achieving a Superplastic Forming Capability Through Severe Plastic Deformation written by and published by . This book was released on 2003 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Processing by severe plastic deformation (SPD) leads to very significant grain refinement in metallic alloys. Furthermore, if these ultra fine grains are reasonably stable at elevated temperatures, there is a potential for achieving high tensile ductilities, and superplastic elongations, in alloys that are generally not superplastic. In addition, the production of ultra fine grains leads to the occurrence of superplastic flow at strain rates that are significantly faster than in conventional alloys so that processing by SPD introduces the possibility of using these alloys for the rapid fabrication of complex parts through superplastic forming operations. This paper examines the development of superplasticity in various aluminum alloys processed by equal-channel angular pressing (ECAP).
Download or read book Ultrafine Grained Materials II written by Yuntian Theodore Zhu and published by John Wiley & Sons. This book was released on 2013-09-25 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a symposium sponsored by the Shaping and Forming Committee of the Materials Processing and Manufacturing Division (MPMD) and the Mechanical Behavior Committee (Jt. SMD/ASM-MSCTS) of the Structural Materials Division (SMD) of TMS (The Minerals, Metals & Materials Society) and held during the 2002 TMS Annual Meeting in Seattle, Washington February 17-21,2002.
Download or read book Superplasticity Current Status and Future Potential Volume 601 written by Patrick B. Berbon and published by Mrs Proceedings. This book was released on 2000 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners. The book, first published in 2000, includes topics on: superplasticity in metals and intermetallics; superplasticity in ceramics; fundamental aspects of superplasticity; superplasticity in industry; high strain rate superplasticity; and developments using severe plastic deformation.
Download or read book Aluminium Alloys written by Subbarayan Sivasankaran and published by BoD – Books on Demand. This book was released on 2017-12-21 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major issue of energy saving and conservation of the environment in the world is being emphasized to us to concentrate on lightweight materials in which aluminium alloys are contributing more in applications in the twenty-first century. Aluminium and its related materials possess lighter weight, considerable strength, more corrosion resistance and ductility. Especially from the past one decade, the use of aluminium alloys is increasing in construction field, transportation industries, packaging purposes, automotive, defence, aircraft and electrical sectors. Around 85% is being used in the form of wrought products, which replace the use of cast iron. Further, the major features of aluminium alloy are recyclability and its abundant availability in the world. In general, aluminium and its related materials are being processed via casting, drawing, forging, rolling, extrusion, welding, powder metallurgy process, etc. To improve the physical and mechanical properties, scientists are doing more research and adding some second-phase particles in to it called composites in addition to heat treatment. Therefore, to explore more in this field, the present book has been aimed and focused to bridge all scientists who are working in this field. The main objective of the present book is to focus on aluminium, its alloys and its composites, which include, but are not limited to, the various processing routes and characterization techniques in both macro- and nano-levels.
Download or read book Equal Channel Angular Extrusion Characteristics on Mechanical Behavior of Aluminum Alloy written by Abiodun Ayodeji Abioye and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials strengthened by conventional methods such as strain hardening, solute additions, precipitation and grain size refinement are often adopted in industrial processes. But there is limitation to the amount of deformation that these conventional methods can impact to a material. This study focused on the review of major mechanical properties of aluminum alloys in the presence of an ultrafine grain size into polycrystalline materials by subjecting the metal to an intense plastic straining through simple shear without any corresponding change in the cross-sectional dimensions of the sample. The effect of the heavy strain rate on the microstructure of aluminum alloys was in refinement of the coarse grains into ultrafine grain size by introducing a high density of dislocations and subsequently re-arranging the dislocations to form an array of grain boundaries. Hence, this investigation is aimed at gathering contributions on the influence of equal channel angular extrusion toward improving the mechanical properties of the aluminum alloys through intense plastic strain.
Download or read book Nanomaterials by Severe Plastic Deformation written by Zenji Horita and published by Trans Tech Publications Ltd. This book was released on 2006-01-15 with total page 1050 pages. Available in PDF, EPUB and Kindle. Book excerpt: Severe Plastic Deformation (SPD) has proved to be an attractive tool for obtaining ultrafine-grained and nanocrystalline materials in bulk form; free of defects such as pores and impurities. Volume is indexed by Thomson Reuters CPCI-S (WoS).
Download or read book Lightweight Structural Metallic Materials written by Minghui Cai and published by Frontiers Media SA. This book was released on 2022-03-29 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Principles of Equal channel Angular Pressing as a Processing Tool for Grain Refinement written by Ruslan Zufarovich Valiev and published by . This book was released on 2006 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superplasticity of Ultra Fine Grained Aluminium Alloys written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superplasticity requires a fine grain size, typically in the range of 1 - 10 microns. Experiments have established that much finer grain sizes, in the near-nanometer range, may be achieved in Al-based alloys by using an intense plastic straining technique such as equal-channel angular (ECA) pressing. This report presents the microstructural characteristics and mechanical properties of several ultrafine-grained Al-based alloys processed by ECA pressing. The first demonstration of enhanced superplasticity at low temperatures and high strain rates revealed in commercial Al-alloys, having ultrafine-grained structure, are described.
Download or read book THERMEC 2009 written by T. Chandra and published by Trans Tech Publications Ltd. This book was released on 2010-01-12 with total page 4100 pages. Available in PDF, EPUB and Kindle. Book excerpt: These are the proceedings of the 6th International Conference on Processing and Manufacturing of Advanced Materials THERMEC2009; held during the period, August 25-29, 2006, in Berlin , Germany under the co-sponsorship of The Minerals, Metals & Materials Society (TMS) ,USA. This work reflects the current ensemble knowledge of world-wide researchers and engineers/technologists working on various aspects of the processing, fabrication, structure/property evaluation and applications of both ferrous and non-ferrous materials; including biomaterials and smart/intelligent materials.
Download or read book Materials Transactions written by and published by . This book was released on 2004 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fifth Pacific Rim International Conference on Advanced Materials and Processing November 2 5 2004 Beijing China written by Z.Y. Zhong and published by . This book was released on 2005 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of the Effects of Equal Channel Angular Pressing on Al 3 Mg Alloy and Al 2219 Alloy written by Cheng Xu and published by . This book was released on 1999 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
