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Pseudoelasticity, or sometimes called superelasticity, is an elastic (impermanent) response to relatively high stress caused by a phase transformation between the austenitic and martensitic phases of a crystal. It is exhibited in Shape memory alloys. Pseudoelasticity is from the reversible motion of domain boundaries during the phase transformation, rather than just bond stretching or the introduction of defects in the crystal lattice (thus it is not true superelasticity but rather pseudoelasticity). Even if the domain boundaries do become pinned, they may be reversed through heating. Thus, a pseudoelastic material may return to its previous shape (hence, shape memory) after the removal of even relatively high applied strains. One special case of pseudoelasticity is called the Bain Correspondence. This involves the austenite/martensite phase transformation between a face centered crystal lattice and a body centered tetragonal crystal structure.
Additional recommended knowledge
Superelastic devices take advantage of their large, reversible deformation and include antennas, eyeglass frames, and biomedical stents.
Nickel Titanium is an example of an alloy exhibiting superelasticity.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Pseudoelasticity". A list of authors is available in Wikipedia.|