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Multiple deformation mechanisms of a metastable β Ti-V alloy at high strain rates
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General Research Institute for Nonferrous Metals

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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    Abstract:

    In the present work, compressive properties and deformation modes of binary Ti-16V alloy have been investigated during dynamic compressive tests performed on split Hopkinson pressure bar. For metastable Ti-16V alloy, the flow stress and strain hardening rate were both independent of the loading strain rate within the strain rate range (1000~3700 s-1) in our experiments. According to the optical microstructure evolution, the critical instability strain rate was confirmed to be about 3000 s-1. Multiple deformation modes including {332}<113> type mechanical twinning and stress induced ω phase transformation were identified by electron backscatter diffraction and transmission electron microscopy. With the help of Schmid factor values calculated in a spherical coordinate system, the dynamic twinning behavior of Ti-16V alloy was analyzed and the critical Schmid factor was proved to be a key parameter determining the activation of twinning behavior. Combining the critical Schmid factor value and true stress, the critical resolved shear stress range of {332}<113> type twinning was calculated to be 334~338 MPa.

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[Wang Qiaochu, Hui Songxiao, Ye Wenjun, Liu Rui, Yu Yang. Multiple deformation mechanisms of a metastable β Ti-V alloy at high strain rates[J]. Rare Metal Materials and Engineering,2019,48(5):1415~1420.]
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History
  • Received:December 13,2017
  • Revised:December 27,2017
  • Adopted:January 09,2018
  • Online: June 04,2019
  • Published: