On mechanical twinning in tetragonal lattice

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F22%3APU147011" target="_blank" >RIV/00216305:26210/22:PU147011 - isvavai.cz</a>
Alternative codes found
RIV/68081723:_____/23:00563902 RIV/00216208:11320/23:10473258
Result on the web
<a href="https://www.tandfonline.com/action/showCitFormats?doi=10.1080%2F14786435.2022.2135037" target="_blank" >https://www.tandfonline.com/action/showCitFormats?doi=10.1080%2F14786435.2022.2135037</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1080/14786435.2022.2135037" target="_blank" >10.1080/14786435.2022.2135037</a>

Result language
angličtina
Original language name
On mechanical twinning in tetragonal lattice
Original language description
The theory of mechanical twinning is revisited for the case of face-centred tetragonal lattices. The motivation is an imprecision in the determination of twinning shear vector magnitude, which occurs repeatedly in the literature. The magnitude of this vector describing the mutual shear of two adjacent crystallographic planes in the process of twin formation is a function of the tetragonality of the lattice c/a. Therefore, we introduce the c/a-dependent factor f which has to be applied to the magnitude of shearing vector < 112] instead of the commonly use factor 1/6, which is correct only for perfect cubic lattices. The theory is verified by ab initio calculations of the generalised planar fault energy curves for three tetragonal materials: the nonmodulated martensite phase of Ni2FeGa magnetic shape memory alloy,.-TiAl intermetallic and pure In. Moreover, the calculations show that the additional modification of shear vector is caused by structural optimisation due to short-range interactions in the vicinity of twin interface, especially for lattices with large deviation of c/a from 1. Such modification cannot be simply predicted from the lattice geometry.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20501 - Materials engineering

Project
<a href="/en/project/GA21-06613S" target="_blank" >GA21-06613S: Twinned structures in magnetic shape memory alloys</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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