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

Kód výsledku v 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>

Nalezeny alternativní kódy

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

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Shape Memory and Superelasticity

ISSN

2199-384X

e-ISSN

—

Svazek periodika

5

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

14

Strana od-do

383-396

Kód UT WoS článku

000498977300001

EID výsledku v databázi Scopus

2-s2.0-85075647320