Recoverability of large strains and deformation twinning in martensite during tensile deformation of NiTi shape memory alloy polycrystals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00511881" target="_blank" >RIV/61389005:_____/19:00511881 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/19:00511540 RIV/68407700:21340/19:00337222

Výsledek na webu

<a href="https://doi.org/10.1016/j.actamat.2019.09.012" target="_blank" >https://doi.org/10.1016/j.actamat.2019.09.012</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.actamat.2019.09.012" target="_blank" >10.1016/j.actamat.2019.09.012</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Recoverability of large strains and deformation twinning in martensite during tensile deformation of NiTi shape memory alloy polycrystals

Popis výsledku v původním jazyce

It is concluded that the plastic deformation of NiTi wires is initiated by deformation twinning in oriented martensite, accompanied by dislocation slip in austenite and/or martensite in extent depending on the test temperature and total strain. The deformation twinning is found to play an ambiguous role in NiTi deformation. When it proceeds at low temperatures (T <= 20 degrees C) beyond the yield point, it raises recoverable strain up to 13%, while at high temperatures (T >= 50 degrees C) when it proceeds already within the plateau range as intermediate step of the stress induced B2=>B19'=>B2(T) martensitic transformation, it restricts the recoverability of transformation strains. The repeated deformation twinning in oriented martensite enables low temperature deformation of NiTi wires with specific microstructure up to similar to 50% strain and causes severe microstructure refinement during the mechanical and thermomechanical processing of NiTi.

Název v anglickém jazyce

Recoverability of large strains and deformation twinning in martensite during tensile deformation of NiTi shape memory alloy polycrystals

Popis výsledku anglicky

It is concluded that the plastic deformation of NiTi wires is initiated by deformation twinning in oriented martensite, accompanied by dislocation slip in austenite and/or martensite in extent depending on the test temperature and total strain. The deformation twinning is found to play an ambiguous role in NiTi deformation. When it proceeds at low temperatures (T <= 20 degrees C) beyond the yield point, it raises recoverable strain up to 13%, while at high temperatures (T >= 50 degrees C) when it proceeds already within the plateau range as intermediate step of the stress induced B2=>B19'=>B2(T) martensitic transformation, it restricts the recoverability of transformation strains. The repeated deformation twinning in oriented martensite enables low temperature deformation of NiTi wires with specific microstructure up to similar to 50% strain and causes severe microstructure refinement during the mechanical and thermomechanical processing of NiTi.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

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

Acta Materialia

ISSN

1359-6454

e-ISSN

—

Svazek periodika

180

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

259

Kód UT WoS článku

000495519100024

EID výsledku v databázi Scopus

2-s2.0-85072273148