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Nucleation and Growth Behavior of Twin Region Around Yield Point of Polycrystalline Pure Ti

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Abstract

The aim of the present study is to investigate the nucleation and growth behavior of twin region around yield point of polycrystalline pure Ti under deformation. Firstly, we prepare commercial polycrystalline pure Ti plate, and investigate the microstructure and pole figures using an Electron Backscatter Diffraction Patterns device. Secondly, tensile specimens are cut out from 0°, 30°, 45° and 90° relative to plate rolling direction. Then, we measure the macroscopic stress–strain curve, local strain distribution and nucleation and growth of twin region arising in specimens under uniaxial tensile loading. Results show the anisotropic characteristics in those behaviors. Those could be related to c axis in hcp lattice. However, detailed anisotropic mechanism may have something to do with several interactions between slips and twins arising in its body. It is also understood that the avalanche behavior of twin region nucleation occurs as a result of larger twin region formation, with inhomogeneous small twin region nucleation in transient process. Finally, we could suppose the bridge mechanism of deformation behaviors from macroscale to microscale for polycrystalline pure Ti under deformation.

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Acknowledgements

The author would like to express my deep gratitude to gratitude to Prof. Mitsutoshi Kuroda (Yamagata University, Japan), Associate Prof. Takuya Uehara (Yamagata University, Japan) and Assistant Prof. Kengo Yoshida (Yamagata University, Japan) for fruitfully discussing about present study. Also, The author would like to express my deep gratitude to Dr. Tadaaki Satake (Yamagata University, Japan), Mr. Masato Obata and Mr. Naotaka Tobita for the help of experiments.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Yamagata University, 4-3-16, Jonan, Yonezawa, Yamagata, 992-8510, Japan

    G. Murasawa (SEM member) & T. Morimoto

  2. Department of Mechanical Engineering, Aoyama Gakuin University, 5-10-1, Fuchinobe, Sagamihara, Kanagawa, 229-8558, Japan

    S. Yoneyama (SEM member)

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  1. G. Murasawa
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  2. T. Morimoto
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  3. S. Yoneyama
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Correspondence to G. Murasawa.

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Murasawa, G., Morimoto, T. & Yoneyama, S. Nucleation and Growth Behavior of Twin Region Around Yield Point of Polycrystalline Pure Ti. Exp Mech 52, 503–512 (2012). https://doi.org/10.1007/s11340-011-9508-x

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  • DOI: https://doi.org/10.1007/s11340-011-9508-x

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