Dependences of Grain Size and Strain-Rate on Deformation Behavior of Commercial Purity Titanium Processed by Multi-Directional Forging

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  • Yamamoto S.
    Division of Mechanical Science and Engineering, Graduate School of Natural Science and Technology, Kanazawa University
  • Miyajima Y.
    Division of Mechanical Engineering, Institute of Science and Engineering, Kanazawa University
  • Watanabe C.
    Division of Mechanical Engineering, Institute of Science and Engineering, Kanazawa University
  • Monzen R.
    Division of Mechanical Engineering, Institute of Science and Engineering, Kanazawa University
  • Tsuru T.
    Japan Atomic Energy Agency
  • Miura H.
    Department of Mechanical Engineering, Toyohashi University of Technology

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Abstract

<p>Strain rate dependencies of deformation behavior of commercial purity titanium specimens having different grain sizes were systematically investigated. Ultrafine-grained titanium with an average grain size of 0.07 µm (UFG-Ti) fabricated by multi-directional forging followed by conventional thermo-mechanical processing, and fine-grained (FG-Ti) and coarse-grained (CG-Ti) specimens with an average grain sizes of 0.8 and 12 µm attained by its, respectively, annealing at 773 and 973 K for 1.8 ks were prepared. The FG- and UFG-Ti specimens exhibited strong strain-rate dependence of 0.2% proof stress, while that of CG-Ti ones were almost constant regardless of applied strain-rate. In-situ X-ray diffraction measurements during tensile tests were also conducted at synchrotron radiation facility, SPring-8. Using the modified Williamson-Hall and the modified Warren-Averbach methods, the activated slip systems and change in dislocation density during deformation were estimated. As a result, it was found that ⟨a⟩ and ⟨c + a⟩ slips were activated in FG- and UFG-Ti specimens. On the other hand, the activation of ⟨c + a⟩ slip was never observed in the CG-Ti ones. It can be, thus, concluded that the different strain-rate dependency of deformation behaviors of specimens with different grain sizes were ascribed to the difference in the deformation mechanisms.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 83 (2019) 465–473.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 61 (12), 2320-2328, 2020-12-01

    The Japan Institute of Metals and Materials

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