Martensitic transition, structure and magnetic anisotropy of martensite in Ni-Mn-Sn single crystal
| Autor: | Paweł Czaja, Norbert Schell, Maciej Szczerba, Maria Bałanda, Cz. Kapusta, Janusz Przewoźnik, Y.I. Chumlyakov, Robert Chulist, Wojciech Maziarz |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Polymers and Plastics Condensed matter physics Metals and Alloys 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Electronic Optical and Magnetic Materials Magnetization Magnetic anisotropy Crystallography Tetragonal crystal system Magnetic shape-memory alloy Martensite Diffusionless transformation 0103 physical sciences Ceramics and Composites Curie temperature 0210 nano-technology Crystal twinning |
| Zdroj: | Acta Materialia. 118:213-220 |
| ISSN: | 1359-6454 |
| Popis: | The structural and magnetic properties of Ni 50 Mn 37.5 Sn 12.5 single crystal were investigated. The alloy undergoes martensitic transformation at 308 K from the austenite phase to the structurally modulated tetragonal 4M martensite phase with lattice parameters a 4M = 6.177 A, c 4M = 5.669 A. The alloy shows 7.9% pre-strain upon uniaxial compression along the 〈001〉 direction, which is near the theoretical 8.2% maximum twinning strain. Magnetization measurements reveal that the magnetic anisotropy of the martensite phase is uniaxial with the easy magnetization axis corresponding to the shortest c axis of the tetragonally distorted unit cell, while its a axis is the hard magnetization direction. The magnetic anisotropy constant K u saturates at low temperature around 7 × 10 4 J/m 3 and then gradually decreases with increasing temperature as the system approaches the Curie temperature of martensite at 215 K. |
| Databáze: | OpenAIRE |
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