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Quantitative reorientation behaviors of macro-twin interfaces in shape-memory alloy under compression stimulus in situ TEM

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Journal of Materials Science & Technology 2022年第12期107卷 243-251页

作者： Bin Chen Chaoshuai Guan Yong Li Chong Yang Junwei Zhang Gang Liu Lingwei Li Yong Peng School of Materials and Energy Electron Microscopy Centre of Lanzhou University and Key Laboratory of Magnetism and Magnetic Materials of the Ministry of EducationLanzhou UniversityLanzhou 730000China Key Laboratory of Novel Materials for Sensor of Zhejiang Province Institute of Advanced Magnetic MaterialsHangzhou Dianzi UniversityHangzhou 310012China School of Materials Science and Engineering Xi’an Jiaotong UniversityXi’an 710000China

Twinning stress is known to be a critical factor for the actuating performance of magnetic shape memory alloys because of the harmful deterioration of their magnetic field-induced strain ***,the intrinsic origin of the high twinning stress is still in *** this work,we firstly fill this gap by precisely probing the reorientation behaviors of A-C and A-B two common macro-twin interfaces under the stimulus of uniaxial compression in-situ transmission electron *** grain boundary is proved to be the main reason for large twinning *** twinning stress of the A-C and A-B type interfaces quantitatively are~0.69 and 1.27 MPa within the plate *** A-C type interface evidently has smaller twinning stress and larger deformation variable than the A-B *** the action of compression,not only the orientations of the crystals have changed,but also the roles of the major and minor lamellae have changed for both interfaces due to the movements of twinning *** insitu and quasi in-situ electron diffraction data,the reorientation process is clearly and intuitively shown by the stereographic *** models and the theory of dislocation motion are proposed to phenomenologically clarify the intrinsic *** work is believed to not only provide a deeper understanding of the deformation mechanism of magnetic shape memory alloys under uniaxial compression testing,but also discover that compression training is not the mechanical training way to decrease the twinning stress of non-modulated martensite in single crystal shape memory alloys.

关键词： Magnetic shape memory alloys Non-modulated martensite reorientation behavior Twinning stress In-situ TEM

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