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1 edition of Grain boundary development in superplastic aluminum alloys found in the catalog.

Grain boundary development in superplastic aluminum alloys

by Michael Edward McMahon

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  • 18 Currently reading

Published by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


About the Edition

Superplasticity may be defined as the capability of certain polycrystalline materials to deform to extensive plastic elongations prior to failure, often without formation of a neck. Typically, superplasticity refers to tensile elongations greater than 200%, although some elongations have been reported in excess of 5000% Ref 1. While it has been suggested that bronze metals in use in ancient civilizations may have possessed superplastic properties Ref 2, most historical reviews credit the modern-day documentation of superplastic behavior to a paper published in the Journal of the Institute of Metals by G.D. Bengough in 1912 which described extensive elongations in brass Ref 3. Recognition of a stress and strain-rate relationship was first presented qualitatively in a paper by Rosenhain in 1920 which examined a near eutectic Zn- Al-Cu alloy Ref 4. Photomicrographs detailing superplastic grain structures in eutectic Sn-Pb and Bi-Pb alloys deformed to elongations of 2000% were presented in 1934 by Pearson Ref 5. This study was the first to identify an equiaxed grain morphology in the deformed regions and suggest that grain boundary migration may be involved in the deformation processes.

Edition Notes

StatementMichael E. McMahon
The Physical Object
Paginationxxvi, 206 p. ;
Number of Pages206
ID Numbers
Open LibraryOL25267134M

Modeling and Simulation of the Forming of Aluminum Sheet Alloys Jeong Whan Yoon and Fre´de´ric Barlat, Alloy Technology and Materials Research Division, Alcoa Technical Center WITH ADVANCES in computer hardware and software, it is possible to model material processing, product manufacturing, product performance in service, and failure. Although. Book Description. A comprehensive treatise on the hot working of aluminum and its alloys, Hot Deformation and Processing of Aluminum Alloys details the possible microstructural developments that can occur with hot deformation of various alloys, as well as the kind of mechanical properties that can be anticipated. The authors take great care to explain and differentiate hot working in the.

Journal of Alloys and Compounds () 88– T. Mungole, P. Kumar*, M. Kawasaki, T.G. Langdon “The contribution of grain boundary sliding in tensile deformation of an ultrafine-grained aluminum alloy having high strength and high ductility", Journal of Materials Science 50 () SHIRLEY: GRAIN BOUNDARY DRAG IN ALLOYS p p' 1. INTRODUCfION The problem of the effect of impurities on grain boundary motion has received a good deal of theor­ etical attention. The first important paper was by Lucke and Detert[1J, and improved versions were later published independently. by Cahn [2J and by Lucke and Stuwe [3, 4].

Micrograin Superplasticity refers to the ability of fine-grained materials (1 µm Cited by: The role of the roll separating force in the high-speed twin-roll casting of aluminum alloys was examined. In horizontal-type twin-roll casting, as the casting speed increased upon decreasing the roll separating force, the strip texture changed from a shear and rolling texture to a random texture.


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Grain boundary development in superplastic aluminum alloys by Michael Edward McMahon Download PDF EPUB FB2

Since grain boundary sliding is one of the dominant features of aluminum alloys superplasticity, its deformation mechanism and the corresponding value of activation energy are included as a part. Superplastic forming is a specialist process used for deforming metal sheet to extremely large plastic strains to produce thin-walled components to the near-net shape.

Stretching of the sheet during superplastic forming is much higher than with rolling and sheet forming. Superplastic forming involves stretching the material at least % beyond its original size, although the deformation can.

The ultrafine grained alloys, however, would experience grain growth in this temperature range unless sufficient amount of second-phase particles are present to pin the grain boundaries. In a very simple way, this becomes the microstructural design guideline for aluminum alloys for.

The mechanisms of high-angle boundary formation in such circumstances have remained unclear. The term “continuous recrystallization” (CRX) has been used as a phenomenological description of recovery-dominated processes that take place uniformly throughout the microstructure and lead to the formation of fine grains with high-angle by: Written by two leading experts in the field, Superplasticity and grain boundaries in ultrafine-grained materials significantly advances our understanding of this important phenomenon and will be.

The current work offers significant new insights into the development and response of superplastic microstructures; in particular, OIM data may be employed to delineate the transition from slip to grain boundary sliding in superplastic : James W.

Harrell. Abstract. Specimens of a super plastic aluminum alloy with grain sizes ranging between 9 and 35 |xm were tensile tested at a strain rate of 1 × 10 - 4 /s at and °C. At °C, the ductility was found to decrease with an increase in grain by: 4.

The evolutions of micro-texture and grain boundary misorientation in superplastic or non-superplastic aluminum alloys have been examined by X-ray, transmission electron microscopy or electron back- scattered diffraction (EBSD) associated with scanning electron microscopy [1–11].

superplasticity of and aluminum lithium alloys Download superplasticity of and aluminum lithium alloys or read online books in PDF, EPUB, Tuebl, and Mobi Format. Click Download or Read Online button to get superplasticity of and aluminum lithium alloys book now.

This site is like a library, Use search box in the. Purchase Aluminum-Lithium Alloys - 1st Edition.

Print Book & E-Book. ISBNThe authors used the concept of superplastic deformation to study the diffusion bonding of superplastic Al alloy Superplastic alloys attain large plastic elongation through grain-boundary sliding -- i.e., very fine internal grains slide and rotate, allowing neighboring grains to switch.

Grain Boundary Analysis - CAMECA. The CAMECA LEAP 3D Atom Pobe is particularly well suited for the characterization of grain boundaries in metals and alloys. Chat Now Send Inquiry; Planar Defects: Grain Boundaries A Grain Boundary Planar Defects: Grain Boundaries.

A collection of papers presented at the 13th International Conference on Aluminum Alloys (ICAA), the premier global conference for exchanging emerging knowledge on the structure and properties of aluminum materials.

The microstructure evolution in a aluminum alloy subjected to thermomechanical processing (TMP) was studied at °C and \\dotε=×10 −3 s −1 at which the material exhibits superplastic behavior with a total elongation of % and the coefficient m= Partially recrystallized initial structure of the as-processed Al consisted of bands of recrystallized grains with a mean Cited by: Dynamic Grain Growth in Superplastic and Non-Superplastic Aluminium Alloys p Cavitation Behaviors in a Tetragonal Zirconia Polycrystal Subjected to Superplastic Deformations Measured by SANS MethodCited by: 3.

Texture, Grain Boundaries and Deformation of Superplastic Aluminum Alloys p A Thermodynamic Framework for the Superplastic Response of MaterialsCited by: 1. A third method to grain refinement is the use of master alloys as grain size refiners in a chemical process.

Master alloys promote nucleation as inoculation is a common type of chemical grain refinement method. The most common master alloys added into aluminum is a mixture of titanium and boron, or titanium may be added by itself.

aluminium lithium alloys iii Download aluminium lithium alloys iii or read online books in PDF, EPUB, Tuebl, and Mobi Format. Click Download or Read Online button to get aluminium lithium alloys iii book now.

This site is like a library, Use search box in the widget to get ebook that you want. Fig. 3 - Aluminum alloy EN AW superplastic forming (Robert, ) Aluminium alloys (Fig. 3) used for superplastic forming are mostly known by their brand name or the name of the product in the market.

In automotive construction, aluminium alloy AA is used for the internal parts of automotive industry with superplastic forming. Damage Development During Superplasticity of Light Alloys R. Boissière, Superplastic forming (SPF) of metallic alloys allows the production of components with particularly complex shapes since in this regime, due to the predominance of grain boundary sliding (GBS), the material exhibits a Cited by: 5.

from three early studies of grain refinement in high purity aluminum are shown in Figure 6 (Cole et al., ). The best refinement was obtained when the Ti added was more than %, the solubility limit of TiAl3 in aluminum.

Figure 3. TiAl3 nucleates aluminum grain Figure 4. Cooling curves during solidificationFile Size: KB. Aluminum Alloys: Structure and Properties is a reference book that provides a concise description of the practical aspects of structures and properties of aluminum alloys.

The book first covers the traits of pure and commercial aluminum, which include the composition, physical and thermal properties, and Edition: [email protected]{osti_, title = {Recrystallization and grain growth phenomena in a particle-reinforced aluminum composite}, author = {Aken, D.C.

van and Krajewski, P E and Vyletel, G M and Allison, J E and Jones, J W}, abstractNote = {Recrystallization and grain growth in a /TiC/15p composite were investigated as functions of the amount of deformation and deformation temperature.