Self-accommodated and pre-strained martensitic microstructure in single-crystalline, metamagnetic Ni–Mn–Sn Heusler alloy

Metamagnetic shape memory alloys are a unique class of materials capable of large magnetic field-induced strain due to reverse martensitic phase transformation. A precondition for large shape change is martensite deformation, which heavily depends on microstructure. Elucidation of microstructure is...

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Bibliographic Details
Published in:Journal of materials science 2017-05, Vol.52 (10), p.5600-5610
Main Authors: Czaja, P., Chulist, R., Szlezynger, M., Skuza, W., Chumlyakov, Y. I., Szczerba, M. J.
Format: Article
Language:English
Subjects:
Alloys
Boundaries
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Conjugation
Crystallography and Scattering Methods
Deformation
Heusler alloys
Magnetic fields
Manganese
Martensite
Martensitic transformations
Materials Science
Microstructure
Microtwins
Modulation
Nickel
Original Paper
Phase transitions
Plates
Polymer Sciences
Shape memory alloys
Single crystals
Solid Mechanics
Strain
Twins
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Summary:Metamagnetic shape memory alloys are a unique class of materials capable of large magnetic field-induced strain due to reverse martensitic phase transformation. A precondition for large shape change is martensite deformation, which heavily depends on microstructure. Elucidation of microstructure is therefore indispensable for strain control and deformation mechanics in such systems. The current paper reports on a self-accommodated martensitic microstructure in metamagnetic Ni 50 Mn 37.5 Sn 12.5 single crystal. The microstructure here is hierarchically organised at three distinct levels. On a large scale, martensite plate colonies, distinguished by intercolony boundaries, group individual martensitic plates. Plates are separated by interplate boundaries and deviate by 2.2° from an ideal twin relation. On the lower scale, plates are composed of subplate twins. Conjugation boundaries separating two pairs of twins arise in relation to a subplate microstructure. Modulation boundaries separating two variants with perpendicular modulation directions and with parallel c -axes also appear. Mechanical training frees larger plates from fine subplate microtwins bringing macro-lamellae into twin relation, what then permits further detwinning until a single variant state.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-017-0793-3