Effect of crystal quality on twinning stress in Ni–Mn–Ga magnetic shape memory alloys

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00546337" target="_blank" >RIV/68378271:_____/21:00546337 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/21:10433382

Výsledek na webu

<a href="http://hdl.handle.net/11104/0322885" target="_blank" >http://hdl.handle.net/11104/0322885</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jmrt.2021.07.081" target="_blank" >10.1016/j.jmrt.2021.07.081</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of crystal quality on twinning stress in Ni–Mn–Ga magnetic shape memory alloys

Popis výsledku v původním jazyce

Low twinning stress (TS) is a prerequisite for magnetic shape memory functionality. We compare Ni50Mn28Ga22 single crystals from four different producers to reveal the effect of crystal quality on the TS. Near the reverse martensite transformation, the TS is generally low, about 1 MPa, regardless of mosaicity of up to 1.7° and chemical composition deviations of up to 2 at.% of Mn. Pure type I and type II twin boundaries occur in crystals with smooth chemical composition gradients. The temperature dependences of TS follow linear trends for type I twins and type II twins, enabling a very low TS down to 2 K for the latter. An intermediate slope appears for mixed type I/type II twin boundaries in a crystal with sharp local chemical deviations. We conclude that the crystal quality affects the magnitude of the TS indirectly, through its impact on the character of the twin boundaries. The effect is weak near the martensite transformation temperature and strong at low temperatures.

Název v anglickém jazyce

Effect of crystal quality on twinning stress in Ni–Mn–Ga magnetic shape memory alloys

Popis výsledku anglicky

Low twinning stress (TS) is a prerequisite for magnetic shape memory functionality. We compare Ni50Mn28Ga22 single crystals from four different producers to reveal the effect of crystal quality on the TS. Near the reverse martensite transformation, the TS is generally low, about 1 MPa, regardless of mosaicity of up to 1.7° and chemical composition deviations of up to 2 at.% of Mn. Pure type I and type II twin boundaries occur in crystals with smooth chemical composition gradients. The temperature dependences of TS follow linear trends for type I twins and type II twins, enabling a very low TS down to 2 K for the latter. An intermediate slope appears for mixed type I/type II twin boundaries in a crystal with sharp local chemical deviations. We conclude that the crystal quality affects the magnitude of the TS indirectly, through its impact on the character of the twin boundaries. The effect is weak near the martensite transformation temperature and strong at low temperatures.

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

2021

Kód důvěrnosti údajů

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

Název periodika

Journal of Materials Research and Technology-JMR&T

ISSN

2238-7854

e-ISSN

2214-0697

Svazek periodika

14

Číslo periodika v rámci svazku

Sept.

Stát vydavatele periodika

BR - Brazilská federativní republika

Počet stran výsledku

11

Strana od-do

1934-1944

Kód UT WoS článku

000702861300009

EID výsledku v databázi Scopus

2-s2.0-85111684247