Superplasticity and superplastic forming of high strength aluminium alloys

  • 3.95 MB
  • English
University of Birmingham , Birmingham
Statementby Hong Sheng Yang.
ID Numbers
Open LibraryOL13891240M

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.

Superplasticity and Superplastic Forming. forming of aluminium alloys on a com-mercial. and high-strength AA series. aluminium. alloys have. Superplasticity at high deformation rates is desirable in order to make superplastic forming more practical.

Recently, superplasticity was achieved at strain rates between 10{sup {minus}2} and s{sup {minus}1} in powder-metallurgy (PM) processed and mechanically alloyed (MA) aluminum by: 5. (In recent times in several aluminum alloys, through the use of grain boundary pinning agents, dispersions, etc., grain sizes of ~1–2 μm or even less have been produced; and in these alloys, superplastic deformation has been observed at strain rates of the order of 10 −2 s −1 or more—the so-called high-strain rate superplasticity (HSRSP).)Cited by: 5.

Abstract. Superplasticity of aluminium alloys was first studied in the Al%Cu eutectic alloy []. After an appropriate treatment, i.e., hot processing, the alloy acquires a microduplex structure and a relative elongation of % at ° by: 4.

Superplasticity in titanium alloys. Application of superplastic forming (SPF) in industry is limited due to long time and high temperature of the forming process.

[12] H. Inagaki, Enhanced. Since the mids, the superplastic characteristics associated with a limited range of structurally significant aluminium, titanium and nickel based alloys have been exploited in the manufacture of aerospace components.

The principal manufacturing route used in the production of these components has been the method of superplastic forming (SPF). Chapter Superplastic forming of aluminium alloys. Abstract: Introduction. History.

Download Superplasticity and superplastic forming of high strength aluminium alloys FB2

Superplastic aluminium alloys. Cavitation in superplastic aluminium alloys. High strain rate superplasticity. Exploitation of superplastic aluminium alloys.

Chapter Quick Plastic Forming of aluminium alloys. Abstract: Relatively new group of superplastic titanium alloys are TiAl or Ti 3Al intermetallics based alloys (Tab.

It is well known that intermetallics based alloys have a high relative strength, and good high-temperature creep resistance. Widespread usage of those materials is limited mainly by their low plasticity precluding. High strain rate superplasticity (HSRS) in ceramic whisker or particulate reinforced aluminum alloy composites is expected to offer an efficiently near-net shape forming technique to automobile, aerospace, and even semi-conductor industries, since the HSRS composites usually exhibit a total elongation of % at a high strain rate of about s{sup {minus}1}.

This book describes advances in the field of superplasticity. This is the ability of certain materials to undergo very large tensile strains, a phenomenon that has increasing commercial applications, but also presents a fascinating scientific challenge in attempts to understand the Cited by: In recent years there has been a largely unspoken demand for a high strength, non-heat treatable aluminium alloy for superplastic forming applications.

This is particularly true for the automotive industry since the high strength, superplastic aluminium alloys, such as AA, are both too time consuming (in forming and heat treatment) and too : Simon Peter Miller-Jupp. For titanium alloys e.g.

Ti 6Al 4V and some stainless steels this is around °C (1, °F) and for aluminium alloys e.g. AA it is between – °C. In this state the material becomes soft so processes that are usually used on plastics can be applied, such as: thermoforming, blow forming, and vacuum forming.

: Advances in Superplasticity and Superplastic Forming (): Eric Taleff: Books. The types of materials in which superplasticity is found now includes metals, metallic composites, intermetallics and ceramics. The ability of materials to exhibit superplasticity is of significant technological interest because complex shapes can be made directly, thereby avoiding complicated and costly joining and machine : Paperback.

Superplastic alloys exhibit extremely high ductility (>%) without cracks when tensile-strained at temperatures above half of their melting point.

Superplasticity, which resembles the flow Cited by: 9. The conventional materials used in superplastic forming operations generally have grain sizes of ~2 µm or larger and they exhibit superplasticity at relatively low strain rates.

Processing by equal-channel angular pressing (ECAP) produces materials having ultrafine-grain sizes, usually in the submicrometer range. If these ultrafine grains show reasonable stability at elevated temperatures Cited by: 3. We have characterized in the Al-Mg system the microstructure and mechanical properties of a cold-rolled Al-6MgSc alloy.

The alloy exhibited superplasticity at relatively high strain rates (about s-1). At a strain rate of s-1 there exists a wide temperature range (`C) within which the tensile elongation is over %.

There also exists a wide strain rate range ( - Cited by: 5. and superplasticity of the magnesium alloys,” in: Superplasticity and Superplastic Forming, TMS (), pp. 91 – Use of the Superplasticity Phenomenon for Developing a Process for Fabricating Parts from Magnesium Alloys Fig.

Cone-shaped cup obtained by the method of superplastic gas form-ing from a sheet of alloy ZK60Awith. SUPERPLASTICITY IN TUNGSTEN-RHENIUM ALLOYS by M. Garfinkle, W.

Description Superplasticity and superplastic forming of high strength aluminium alloys EPUB

Witzke, and W. Klopp Lewis Research Center SUMMARY The tensile properties of binary tungsten-rhenium alloys containing up to atomic­ percent rhenium were determined at temperatures from 78° to ° F (25° to ° C). Buy Advances in Superplasticity and Superplastic Forming: Proceedings of the International Symposium by Sanders, D.G., Dunand, D.C.

(ISBN: ) from Amazon's Book Store. Everyday low prices and free delivery on eligible : Paperback. Chapter 1 Introduction Interest in superplasticit y is extremel y high.

The majo r areas includ e superplastic - ity in metals, ceramics, intermetallics, and composites. Superplasticity at very high strain rates (i.e., approximatel y s"1) is an area of strong emphasis thatFile Size: 1MB. Evaluation of microstructure and superplasticity in friction stir processed Al alloy.

tages of superplastic forming are several and rewarding, weldability, lower density, and moderately high strength. For more than a decade now, two broad approaches have.

Part 2: Processing of Al–Li Alloys. References. Chapter 8. Superplasticity in and Superplastic Forming of Aluminum–Lithium Alloys. Introduction. Superplasticity. Superplastic Forming. Role of Friction Stir Processing on Superplastic Forming.

Details Superplasticity and superplastic forming of high strength aluminium alloys PDF

Applications. Concluding Remarks. References. Further Reading. Chapter 9. SuperPlasticity is a viable technique for forming complex-shaped structures. The technique has the advantages of deliverin exceptional formability and potentially giving good dimensional tolerance f 1].

The objective of this research is to develop a basic understanding on superplasticity in metal alloys, and articularly aluminum by: 5.

metals and alloys [2]. Presently there are numerous reports of enhanced superplasticity in UFG aluminum alloys processed by ECAP [3]. For example, very high superplastic elongation to failure more than % has been observed in the aluminum alloys Al-Mg-Sc [].

Superplasticity in advanced materials: ICSAM Recent Developments and Future Prospects --Superplasticity of Metallic Alloys: of Al-Mg Alloys with Different Levels of Mn and Fe for Super-Plastic Forming --Chronicling the Development of a High Strength 5xxx-Based Superplastic Aluminium Alloy --Improving the Microstructure and.

Increasing the strain rate at superplastic forming is a challenging technical and economic task of aluminum forming manufacturing. New aluminum sheets exhibiting high strain rate superplasticity at strain rates above s−1 are required.

This study describes the microstructure and the superplasticity properties of a new high-strength Al-Zn-Mg-based alloy processed by a simple. alloys) and insufficient strength after superplastic forming (Zn and Al alloys).

To overcome these limitations, iron-based superplastic alloys, such as duplex stainless steel (DSS)13–17 and ultrahigh carbon steel (UCS)18–22, were developed. Although showing promising superplasticity, these steels are not applied commercially due to their. Keywords: superplasticity, ultrafine grained, strain rate m coefficient, boundary sliding, high-strength low alloy steels (HSLA steels) 1.

Introduction.- Superplasticity is the ability of polycrystalline solids (metals) to achieve extremely high and uniform elongations (from to %) when applying tensile stresses. – Physics of strength, plasticity and superplasticity of polycrystalline materials; – Theoretical and experimental studies of structure and properties of grain boundaries in metals, alloys.

SUPERPLASTICITY OF MAGNESIUM ALLOYS Greger M. 1, Kocich R., Kander L.2 1VSB-Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Department of materials forming, listop 33 Ostrava Poruba, Česká republika @This book describes the fundamentals and potential applications of ‘friction stir superplasticity for unitized structures’.

Conventional superplastic forming of sheets is limited to the thickness of 3 mm because the fine grained starting material is produced by : Elsevier Science.