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Shape Memory Alloys

Shape Memory Alloys In some alloys, a given plastic strain recovers completely when the con­ cerned alloy is heated above a certain temperature. This phenomenon, shape memory effect (SME), was observed in Au-Cd (1) and In-Tl (2) alloys in the first half of 1950s. However, SME was not a focus of research until it was found in a Ti-Ni alloy (3) in 1963, when the phenomenon was first termed the shape memory effect. A similar phenomenon was found in a Cu-AI-Ni alloy as well (3a). At that time, however, SME was considered to be a peculiar phenomenon limited to the specific Ti-Ni alloy. In 1970, Otsuka & Shimizu (4, 4a) unambiguously demonstrated a one­ to-one correspondence between SME and the thermoelastic martensitic transformation in a Cu-AI-Ni alloy. Thus, they concluded that SME is characteristic of alloys exhibiting thermoelastic martensitic trans­ formations. They ascribed the origin to the crystallographic reversibility of the thermoelastic transformation and the presence of a recoverable deformation mode, i.e. twinning, in thermoelastic alloys. Since then, there 0084-6600/88/0801--{)025$02.00 25 TADAK!, OTSUKA & SHIMIZU have been a great number of investigations (5, 5a) of SME and various phenomena related to thermoelastic transformations (see Section III). As a result, SME is http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Materials Research Annual Reviews

Shape Memory Alloys

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Publisher
Annual Reviews
Copyright
Copyright 1988 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
0084-6600
DOI
10.1146/annurev.ms.18.080188.000325
Publisher site
See Article on Publisher Site

Abstract

In some alloys, a given plastic strain recovers completely when the con­ cerned alloy is heated above a certain temperature. This phenomenon, shape memory effect (SME), was observed in Au-Cd (1) and In-Tl (2) alloys in the first half of 1950s. However, SME was not a focus of research until it was found in a Ti-Ni alloy (3) in 1963, when the phenomenon was first termed the shape memory effect. A similar phenomenon was found in a Cu-AI-Ni alloy as well (3a). At that time, however, SME was considered to be a peculiar phenomenon limited to the specific Ti-Ni alloy. In 1970, Otsuka & Shimizu (4, 4a) unambiguously demonstrated a one­ to-one correspondence between SME and the thermoelastic martensitic transformation in a Cu-AI-Ni alloy. Thus, they concluded that SME is characteristic of alloys exhibiting thermoelastic martensitic trans­ formations. They ascribed the origin to the crystallographic reversibility of the thermoelastic transformation and the presence of a recoverable deformation mode, i.e. twinning, in thermoelastic alloys. Since then, there 0084-6600/88/0801--{)025$02.00 25 TADAK!, OTSUKA & SHIMIZU have been a great number of investigations (5, 5a) of SME and various phenomena related to thermoelastic transformations (see Section III). As a result, SME is

Journal

Annual Review of Materials Research – Annual Reviews

Published: Aug 1, 1988

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