Martensitic transformation in rapidly solidified Heusler Ni49Mn39Sn12 ribbons
Martensitic transformation in rapidly solidified Heusler Ni49Mn39Sn12 ribbons
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DOI：
10.1016/j.actamat.2011.05.044
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发表时间：
2011-08
期刊：
影响因子：
9.4
通讯作者：
Hongxing Zheng;Dianzhen Wu;S. Xue;J. Frenzel;G. Eggeler;Q. Zhai
中科院分区：
文献类型：
--
作者：
Hongxing Zheng;Dianzhen Wu;S. Xue;J. Frenzel;G. Eggeler;Q. Zhai
本文采用电子显微镜、X射线衍射和差示扫描量热法研究了Heusler Ni 49 Mn 39 Sn 12合金快淬态和退火态薄带的组织演变和马氏体相变动力学。两种薄带在热循环过程中都发生了可逆马氏体相变，通过原位冷却透射电镜研究证实了低温马氏体为调制的四层正交（4 O）结构。从电子浓度、Mn-Mn原子间距、原子有序度和晶粒尺寸等方面讨论了退火对马氏体相变行为的影响。发现相变动力学具有很强的冷却速率依赖性，并对其机理进行了分析。该合金薄带在热循环试验中获得了良好的重复性，具有很大的应用潜力。
In the present work, the microstructure evolution and kinetics of the martensitic transformation are investigated in as-spun and annealed ribbons of Heusler Ni49Mn39Sn12using electron microscopy, X-ray diffraction and differential scanning calorimetry. Both ribbons undergo a reversible martensitic transformation during thermal cycling and the low-temperature martensite is confirmed to be a modulated four-layered orthorhombic (4O) structure through in situ cooling transmission electronic microscopy investigation. The annealing effect on the martensitic transformation behavior is discussed from the viewpoints of electron concentration, Mn–Mn interatomic distance, atomic order degree and grain size. A strong cooling-rate dependence of phase transition kinetics is found and the mechanism is analyzed. The satisfactory reproducibility obtained during thermal cycling test of this alloy ribbons offers great potential for practical applications.