Composition-dependent crystal structure and martensitic transformation in Heusler Ni–Mn–Sn alloys
作者： Hongxing Zheng , Wu Wang , Sichuang Xue , Qijie Zhai , Jan Frenzel
DOI: 10.1016/J.ACTAMAT.2013.04.035
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摘要: Abstract In the present work, modulated four- and five-layered orthorhombic, seven-layered monoclinic (4O, 10M 14M) unmodulated double tetragonal (L10) martensites are characterized in Heusler Ni–Mn–Sn alloys using X-ray diffraction, high-resolution transmission electron microscopy, diffraction techniques thermal analysis. All layered exhibit twins stacking faults, while L10 martensite shows fewer structural defects. The substitution of Sn with Mn Ni50Mn37+xSn13−x (x = 0, 2, 4) enhances martensitic transition temperatures, temperatures decrease increasing content for constant levels Ni50−yMn37+ySn13 (y = 0, 4). compositional dependence is mainly attributed to valence concentration (e/a) unit-cell volume high-temperature phase. With (or e/a), resultant crystal structure evolves a sequence 4O → 10M → 14M → L10 bulk alloys.
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