Compliant Lattice Modulations Enable Anomalous Elasticity in Ni-Mn-Ga Martensite

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F24%3A00598952" target="_blank" >RIV/61388998:_____/24:00598952 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/24:00598952 RIV/68407700:21340/24:00378091

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/10.1002/adma.202406672" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/adma.202406672</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/adma.202406672" target="_blank" >10.1002/adma.202406672</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Compliant Lattice Modulations Enable Anomalous Elasticity in Ni-Mn-Ga Martensite

Popis výsledku v původním jazyce

High mobility of twin boundaries in modulated martensites of Ni–Mn–Ga-based ferromagnetic shape memory alloys holds a promise for unique magnetomechanical applications. This feature has not been fully understood so far, and in particular, it has yet not been unveiled what makes the lattice mechanics of modulated Ni–Mn–Ga specifically different from other martensitic alloys. Here, results of dedicated laser-ultrasonic measurements on hierarchically twinned five-layer modulated (10M) crystals fill this gap. Using a combination of transient grating spectroscopy and laser-based resonant ultrasound spectroscopy, it is confirmed that there is a shear elastic instability in the lattice, being significantly stronger than in any other martensitic material and also than what the first-principles calculations for Ni–Mn–Ga predict. The experimental results reveal that the instability is directly related to the lattice modulations. A lattice-scale mechanism of dynamic faulting of the modulation sequence that explains this behavior is proposed, this mechanism can explain the extraordinary mobility of twin boundaries in 10M.

Název v anglickém jazyce

Compliant Lattice Modulations Enable Anomalous Elasticity in Ni-Mn-Ga Martensite

Popis výsledku anglicky

High mobility of twin boundaries in modulated martensites of Ni–Mn–Ga-based ferromagnetic shape memory alloys holds a promise for unique magnetomechanical applications. This feature has not been fully understood so far, and in particular, it has yet not been unveiled what makes the lattice mechanics of modulated Ni–Mn–Ga specifically different from other martensitic alloys. Here, results of dedicated laser-ultrasonic measurements on hierarchically twinned five-layer modulated (10M) crystals fill this gap. Using a combination of transient grating spectroscopy and laser-based resonant ultrasound spectroscopy, it is confirmed that there is a shear elastic instability in the lattice, being significantly stronger than in any other martensitic material and also than what the first-principles calculations for Ni–Mn–Ga predict. The experimental results reveal that the instability is directly related to the lattice modulations. A lattice-scale mechanism of dynamic faulting of the modulation sequence that explains this behavior is proposed, this mechanism can explain the extraordinary mobility of twin boundaries in 10M.

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

2024

Kód důvěrnosti údajů

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

Název periodika

Advanced Materials

ISSN

0935-9648

e-ISSN

1521-4095

Svazek periodika

36

Číslo periodika v rámci svazku

39

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

2406672

Kód UT WoS článku

001288420900001

EID výsledku v databázi Scopus

2-s2.0-85200991594