Abstract In this work, crystallographic, microstructural and magnetocaloric investigations were performed on textured Ni 50 Mn 35.25 In 14.75 melt-spun ribbons with low thermal (6 K) and magnetic-field induced hysteresis (−0.73 J kg −1 at 2 T) and moderate maximum magnetic entropy change Δ S M max (11 J kg −1 K −1 at 5 T) at room temperature (302 K). The austenite in the ribbons crystallizes into a L2 1 structure, whereas martensite has a monoclinic incommensurate 6 M modulated structure as determined with the superspace theory. By means of electron backscatter diffraction technique, the morphological and crystallographic features of microstructure were systematically characterized. Ribbons possess a fine microstructure with an average grain size (initial austenite phase) of around 10 μm, whereas the 6 M martensite has a self-accommodated microstructure with 4 kinds of twin-related martensite variants. During inverse martensitic transformation, the austenite prefers to nucleate at the grain boundaries of initial austenite. By means of cofactor conditions and crystallographic orientation analyses, the good geometrical compatibility between austenite and martensite was confirmed. Based on the crystal structure and microstructure information obtained, the reason of the low thermal hysteresis was discussed.

中文翻译：

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Ni 50.0 Mn 35.25 In 14.75 熔纺带的结晶和微观结构特征与低滞后行为之间的相关性

摘要 在这项工作中，对具有低热 (6 K) 和磁场感应滞后 (-0.73 J kg -1 在 2 T) 和织构的 Ni 50 Mn 35.25 In 14.75 熔纺带进行了晶体学、微观结构和磁热研究。在室温 (302 K) 下中等最大磁熵变 Δ SM max (11 J kg -1 K -1 at 5 T)。带中的奥氏体结晶成 L2 1 结构，而马氏体具有单斜不公度的 6 M 调制结构，如超空间理论所确定。通过电子背散射衍射技术，系统地表征了微观结构的形态和晶体特征。带材具有精细的微观结构，平均晶粒尺寸（初始奥氏体相）约为 10 μm，而 6 M 马氏体具有自调节微观结构，具有 4 种孪生相关马氏体变体。在逆马氏体转变过程中，奥氏体更倾向于在初始奥氏体的晶界处形核。通过辅助因素条件和晶体取向分析，证实了奥氏体和马氏体之间良好的几何相容性。基于获得的晶体结构和微观结构信息，讨论了低热滞的原因。证实了奥氏体和马氏体之间良好的几何相容性。基于获得的晶体结构和微观结构信息，讨论了低热滞的原因。证实了奥氏体和马氏体之间良好的几何相容性。基于获得的晶体结构和微观结构信息，讨论了低热滞的原因。