Generation of plastic strains by the martensitic transformations under stress via dislocation slip in martensite as the origin of functional fatigue

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00639619" target="_blank" >RIV/68378271:_____/25:00639619 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0370189" target="_blank" >https://hdl.handle.net/11104/0370189</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s40830-025-00550-z" target="_blank" >10.1007/s40830-025-00550-z</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Generation of plastic strains by the martensitic transformations under stress via dislocation slip in martensite as the origin of functional fatigue

Popis výsledku v původním jazyce

The instability of cyclic thermomechanical responses of NiTi (functional fatigue) represents one of the unsolved problems of NiTi technology. It has been intuitively understood that it originates from plastic deformation accompanying Martensitic Transformation (MT), but it is not known why and how it occurs. The mechanism by which thermomechanically loaded NiTi generates plastic strains has remained blurred for several decades despite its importance and research effort aimed at revealing the origin of functional fatigue. Recently, we investigated incremental plastic strains, martensite variant microstructures, martensite textures, and permanent lattice defects generated by forward and reverse MTs proceeding under tensile stress in experiments on superelastic (SE) and shape memory (SME) NiTi wires having recrystallized nanograin microstructure. In this work, based on the results of these earlier works, we propose the mechanism by which forward and reverse MTs proceeding under stresses above certain thresholds generate incremental plastic strains, the magnitudes of which are characteristic for stress–temperature conditions at which the MTs occurred.

Název v anglickém jazyce

Generation of plastic strains by the martensitic transformations under stress via dislocation slip in martensite as the origin of functional fatigue

Popis výsledku anglicky

The instability of cyclic thermomechanical responses of NiTi (functional fatigue) represents one of the unsolved problems of NiTi technology. It has been intuitively understood that it originates from plastic deformation accompanying Martensitic Transformation (MT), but it is not known why and how it occurs. The mechanism by which thermomechanically loaded NiTi generates plastic strains has remained blurred for several decades despite its importance and research effort aimed at revealing the origin of functional fatigue. Recently, we investigated incremental plastic strains, martensite variant microstructures, martensite textures, and permanent lattice defects generated by forward and reverse MTs proceeding under tensile stress in experiments on superelastic (SE) and shape memory (SME) NiTi wires having recrystallized nanograin microstructure. In this work, based on the results of these earlier works, we propose the mechanism by which forward and reverse MTs proceeding under stresses above certain thresholds generate incremental plastic strains, the magnitudes of which are characteristic for stress–temperature conditions at which the MTs occurred.

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

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

2199-3858

Svazek periodika

11

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

29

Strana od-do

679-707

Kód UT WoS článku

001535100600001

EID výsledku v databázi Scopus

2-s2.0-105011348400