Abstract
The Heusler compound with the L21 Ni54Mn20Fe1Ga25 structure subject to high-pressure torsional megaplastic deformation was first systematically studied by in situ methods of X-ray phase analysis and transmission and scanning electron microscopy. It was established that the torsional shear deformation at room temperature reduces the polycrystalline structure of the compound to a nanocrystalline and partially amorphous state. It was revealed that, as the pressure increases from 3 to 5 GPa and the degree of deformation increases from 2 to 5 revolutions, total atomic disordering and sequential structural-phase transformation according to the scheme B2(bcc) → A2(bcc) → A1(fcc) occur. It is shown that annealing at a temperature of 570 K and below causes devitrification of the amorphous phase and annealing at a temperature of 620 K and above causes the restoration of the L21 structure. The dimensional effect of suppressing the thermoelastic martensitic transformation is revealed in the nanostructured austenitic L21 alloy with grains smaller than 80 nm when cooled to 120 K. The capability of the thermoelastic martensitic transformation and of the shape memory is restored in a submicrocrystalline ultrafine-grained alloy after its recrystallization annealing at temperatures above 600 K.
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Funding
The research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme “Structure” no. AAAA-A18-118020190116-6) and of the Joint Laboratory of the Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences and of the Yeltsin Ural Federal University.
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Pushin, V.G., Kuranova, N.N., Marchenkova, E.B. et al. Atomic Disordering and BCC → FCC Transformation in the Heusler Compound Ni54Mn20Fe1Ga25 Subject to High-Pressure Torsional Megaplastic Deformation. Tech. Phys. 65, 602–611 (2020). https://doi.org/10.1134/S1063784220040179
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DOI: https://doi.org/10.1134/S1063784220040179