B2 -> B19' ->B2(T) Martensitic Transformation as a Mechanism of Plastic Deformation of NiTi

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00518400" target="_blank" >RIV/61389005:_____/19:00518400 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/19:00520328 RIV/61388998:_____/19:00520328 RIV/68407700:21340/19:00337170

Result on the web

<a href="https://doi.org/10.1007/s40830-019-00250-5" target="_blank" >https://doi.org/10.1007/s40830-019-00250-5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s40830-019-00250-5" target="_blank" >10.1007/s40830-019-00250-5</a>

Result language

angličtina

Original language name

B2 -> B19' ->B2(T) Martensitic Transformation as a Mechanism of Plastic Deformation of NiTi

Original language description

Deformation of superelastic NiTi wire with tailored microstructure was investigated in tensile loading-unloading tests up to the end of the stress plateau in wide temperature range from room temperature up to 200 degrees C. Lattice defects left in the microstructure of deformed wires were investigated by transmission electron microscopy. Tensile deformation is localized up to the highest test temperatures, even if practically no martensite phase exists in the wire at the end of the stress plateau. In tensile tests at elevated temperatures around 100 degrees C, at which the upper plateau stress approaches the yield stress for plastic deformation of martensite, upper plateau strains become unusually long, transformation strains become unrecoverable and deformation bands containing {114} austenite twins appear in the microstructure of deformed wires. These observations were rationalized by assuming activity of B2 -> B19' ->B2(T) martensitic transformation into the austenite twins representing a new mechanism of plastic deformation of NiTi, additional to the dislocation slip in austenite and/or martensite. It is claimed that this transformation becomes activated in any thermomechanical load in which the oriented B19 ' martensite is exposed to high stress at high temperatures, as e.g., during shape setting or actuator cycling at high applied stress.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Shape Memory and Superelasticity

ISSN

2199-384X

e-ISSN

—

Volume of the periodical

5

Issue of the periodical within the volume

4

Country of publishing house

CH - SWITZERLAND

Number of pages

14

Pages from-to

383-396

UT code for WoS article

000498977300001

EID of the result in the Scopus database

2-s2.0-85075647320