Abstract
The lattice parameters of the matrix of modulated 14M martensite in the Ni51Mn24Ga25 and Ni63Al37 alloys are calculated. The mechanism of martensitic transformation in alloys with a seven-layer martensite structure is determined, which includes shear deformation of the austenite lattice in the initial L21 phase along the (112) plane in the \(\left[ {\bar {1}\bar {1}1} \right]\) direction and additional compressive and tensile deformations in three mutually perpendicular directions. The deformation of martensite with an invariant lattice takes place through the formation of bilayered twins that create a seven-layer modulation of the crystal structure of martensite. The crystallographic characteristics of the martensitic transformation are calculated.
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This study was performed within the framework of State assignment from the Ministry of Education and Science of Russian Federation on topics Structure (no. AAAA-A18-118020190116-6) and Pressure (no. AAAA-A18-118020190104-3).
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Translated by O. Kadkin
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Gundyrev, V.M., Zel’dovich, V.I. Crystallographic Analysis and Mechanism of Thermoelastic Martensitic Transformation in Heusler Alloys with a Seven-Layer Martensite Structure. Phys. Metals Metallogr. 123, 25–31 (2022). https://doi.org/10.1134/S0031918X22010069
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DOI: https://doi.org/10.1134/S0031918X22010069