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Microstructure of stress-induced martensite in nanocrystalline NiTi shape memory alloy

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Abstract

The microstructure of stress-induced martensite (SIM) in the nanocrystalline NiTi alloy was investigated by means of transmission electron microscopy (TEM). The result shows that the multi-variant structure of the martensite is suppressed and only single-variant martensitic twins form after tensile deformation when the grain size is smaller than 80 nm. The normal directions of the (001)B19′ twin planes are all within the range of 45° from the axial direction of the wire. The angle between twin crystals (\(\bar{1}11\))M and (111)T of the SIM is also found to be smaller than that of thermally induced martensite in nanocrystalline NiTi.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (No.51231008) and the Key Project of Chinese Ministry of Education (No.313055).

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Authors and Affiliations

  1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China

    Xiao-Bin Shi, Li-Shan Cui, Zhen-Yang Liu, Da-Qiang Jiang & Xiao-Dong Han

  2. Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing, 100124, China

    Xiao-Dong Han

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  1. Xiao-Bin Shi
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  2. Li-Shan Cui
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Correspondence to Li-Shan Cui.

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Shi, XB., Cui, LS., Liu, ZY. et al. Microstructure of stress-induced martensite in nanocrystalline NiTi shape memory alloy. Rare Met. 33, 379–382 (2014). https://doi.org/10.1007/s12598-014-0343-y

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  • DOI: https://doi.org/10.1007/s12598-014-0343-y

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