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superplasticity

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Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005433
EISBN: 978-1-62708-196-2
... Abstract This article presents a mechanical description of superplasticity and discusses constitutive equations that are essential for simulating superplastic forming processes, applicable to structural superplasticity. It presents the phenomenological constitutive equations of superplasticity...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004010
EISBN: 978-1-62708-185-6
... schematic of a more sophisticated roll forming mill that can employ both axial and radial roll forming is shown in Fig. 3 . This hot roll forming mill was developed at the Institute for Metals Superplasticity Problems (IMSP), Ufa, Russia, to form axisymmetric and flanged shapes by localized, incremental...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004020
EISBN: 978-1-62708-185-6
..., followed by the models of constitutive behavior. It provides a discussion on creep mechanisms involving dislocation and diffusional flow, such as the Nabarro-Herring creep and the Coble creep. The equations for the several creep rates are also presented. Research on the mechanism of the superplastic flow...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006282
EISBN: 978-1-62708-169-6
... strain hardening and its effects on the mechanical properties of titanium alloys. It also discusses the factors that influence the superplasticity of titanium alloys. crystallographic texture deformation grain growth recrystallization strain hardening strengthening superplasticity titanium...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003177
EISBN: 978-1-62708-199-3
... forming, explosive forming, electromagnetic forming, and superplastic forming. auxiliary equipment blanking contour roll forming deep drawing die materials drop hammer forming electromagnetic forming explosive forming fine-edge blanking forming by multiple-slide machines forming machines...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005458
EISBN: 978-1-62708-196-2
... nucleation cracklike interface cavities cavity growth large-faceted cavities cavity initiation creep cavitation superplastic deformation hot deformation process modeling THE FORMATION AND GROWTH of internal voids in metallic alloys are of considerable concern in components produced by...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009010
EISBN: 978-1-62708-185-6
...-6Al-4V) alloy. Source: Ref 37 An important requirement for cavitation during flow under either hot-working or superplastic conditions is the presence of a tensile stress. On the other hand, under conditions of homogeneous compression, cavitation is not observed; in fact, cavities that may be...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003985
EISBN: 978-1-62708-185-6
...; Whitney termed Gatorizing ( Ref 6 ). This process included powder billet manufacture providing a fine-grained product preconditioned for superplastic forming. This billet when forged within a narrow window of temperature and strain rate would provide NNS forgings. Mechanical properties were then optimized...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005409
EISBN: 978-1-62708-196-2
..., and fabricated into finished components via closed-die forging, superplastic forming, and so on ( Ref 3 , 4 ). The TMP of ingots of alpha/beta and near-alpha titanium alloys comprises a large amount of hot work in the beta-phase field, a small increment of hot work in the alpha+beta field...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003999
EISBN: 978-1-62708-185-6
... of precipitates. In this condition, the material exhibits superplastic properties that are characterized by large tensile elongations, good die-filling capacity, and relatively low flow stress. Superplastic nickel-base materials exhibit a large strain-rate sensitivity that provides the mechanism for...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004016
EISBN: 978-1-62708-185-6
... processed metals and alloys with submicrometer structures ( Ref 25 ). Although high diffusivity can reduce thermal stability of processed materials, it provides an increase in the ability for superplastic forming ( Ref 21 ). Also, enhanced diffusivity together with simple shear deformation mode has...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003993
EISBN: 978-1-62708-185-6
... article “Dies and Die Materials for Hot Forging” in this Volume). Deformation mechanisms during hot working include microstructural processes such as: Dynamic recrystallization (DRX) Superplastic deformation Dynamic recovery Void formation Flow instability processes (such...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003181
EISBN: 978-1-62708-199-3
... other metals. This section deals with those aspects of deep drawing that are peculiar to aluminum alloys. It is restricted to procedures using a rigid punch and die. Superplastic behavior has been demonstrated in several aluminum alloys, including the high-strength alloy 7475...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004001
EISBN: 978-1-62708-185-6
... lead to substantial improvements in room-temperature tensile properties ( Ref 13 ) and make them superplastic; superplastic material has been isothermally forged into jet engine turbine disks at 1100 °C (2010 °F) and a nominal strain rate of 8.3×10 −3 s −1 ( Ref 13 ). A number of investigations...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005421
EISBN: 978-1-62708-196-2
... simultaneously occurring stages, that is, nucleation, growth, and coalescence. An important requirement for cavitation during deformation under either conventional hot working (high-strain-rate) conditions or superplastic forming is the presence of a tensile stress. Under conditions of homogeneous compression...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004007
EISBN: 978-1-62708-185-6
... hydrostatic pressure includes the densification of porous powder metallurgy products where both cold isostatic pressing (CIP) and hot isostatic pressing (HIP) are utilized. In addition, many superplastic-forming operations conducted at intermediate to high homologous temperatures utilize a backpressure of the...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009012
EISBN: 978-1-62708-185-6
... of the material deformation resistance. A limitation of elevated-temperature tensile testing is necking, which prematurely limits or obscures the strain to which the specimen may be deformed. Elevated-temperature tensile testing is often used to assess superplasticity by determining the uniform...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.9781627081757
EISBN: 978-1-62708-175-7
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009013
EISBN: 978-1-62708-185-6
... edge cracking during rolling operations, central bursting during extrusion, cavitation during superplastic forming of aluminum alloys, or even cracking of the tooling itself. In these instances, combining the use of damage criterion ( Ref 1 , 2 , 3 , 4 , 5 ) with process modeling generally allows...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003144
EISBN: 978-1-62708-199-3
..., coinage Zn-Cu-Ti Roofing, gutters, and downspouts; building construction materials; deep-drawn hardware; address plates; solar collectors Zn-Pb-Cd-Fe Building construction materials, dry-cell battery cans, deep-drawn hardware, address plates, electrical components Zn-Al (superplastic zinc...