superplasticity


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superplasticity

[¦sü·pər·pla′stis·əd·ē]
(metallurgy)
The unusual ability of some metals and alloys to elongate uniformly by thousands of percent at elevated temperatures, much like hot polymers or glasses.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Superplasticity

The unusual ability of some metals and alloys to elongate uniformly thousands of percent at elevated temperatures, much like hot polymers or glasses. Under normal creep conditions, conventional alloys do not stretch uniformly, but form a necked-down region and then fracture after elongations of only 100% or less. The most important requirements for obtaining superplastic behavior include a very small metal grain size, a well-rounded (equiaxed) grain shape, a deformation temperature greater than one-half the melting point, and a slow deformation rate. See Alloy, Creep (materials), Eutectics

Superplasticity is important to technology primarily because large amounts of deformation can be produced under low loads. Thus, conventional metal-shaping processes (for example, rolling, forging, and extrusion) can be conducted with smaller, and cheaper equipment. Nonconventional forming methods can also be used; for instance, vacuum-forming techniques, borrowed from the plastics industry, have been applied to sheet metal to form car panels, refrigerator door linings, and TV chassis parts. See Metal forming

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Since we have already discussed Marten-sitic Transformations and Twinning, we would like to briefly discuss the Superplasticity or Pseudoplasticity phenomenon.
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Superplasticity in advanced materials; ICSAM 2009; proceedings.
Superplasticity in advanced materials; ICSAM 2009; proceedings
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The term 'superplasticity' describes the capability of certain polycrystalline materials such as 8090 Al-Li alloy, Ti-6Al-4V alloy, and so forth, to undergo extensive tensile plastic deformation prior to failure under specific temperature and strain-rate conditions.
Finite element analysis of superplastic blow-forming of Ti-6Al-4V sheet into closed ellip-cylindrical die
The interest in grain-size reduction is driven by the possibility to produce ultrahigh strength metals and high strain rate superplasticity, (Eivani & Taheri, 2007).
Consideration regarding die design for equal channel angular extrusion
But scientists don't expect this superplasticity in a rigid, crystalline material like sodium chloride, says study coauthor Nathan Moore of Sandia National Laboratories in Albuquerque.
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(1996) Strength, ductility and superplasticity of microcrystalline two-phase materials.
Hard erosion-resistant graded coatings deposited in vacuum
Author John Martin includes new information on emerging topics, such as superplasticity and the Bauschinger Effect, and expanded coverage of organic polymers.
Materials for Engineering. Third Edition
Ferrasse, Superplasticity and Superplastic Forming, p.
Simple Shear Plastic Deformation Behavior of Polycarbonate Plate Due to the Equal Channel Angular Extrusion Process. I: Finite Element Methods Modeling

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