Effect of crystal quality on twinning stress in Ni–Mn–Ga magnetic shape memory alloys
The result's identifiers
Result code in 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>
Alternative codes found
RIV/00216208:11320/21:10433382
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Effect of crystal quality on twinning stress in Ni–Mn–Ga magnetic shape memory alloys
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Materials Research and Technology-JMR&T
ISSN
2238-7854
e-ISSN
2214-0697
Volume of the periodical
14
Issue of the periodical within the volume
Sept.
Country of publishing house
BR - BRAZIL
Number of pages
11
Pages from-to
1934-1944
UT code for WoS article
000702861300009
EID of the result in the Scopus database
2-s2.0-85111684247