Grain refinement in titanium prevents low temperature oxygen embrittlement

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  • 崇, 巌
    Department of Materials Science and Engineering, University of California, Berkeley; Department of Materials Science and Engineering, Kyoto University; Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University; National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley
  • Gholizadeh, Reza
    Department of Materials Science and Engineering, Kyoto University
  • 都留, 智仁
    Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University; Nuclear Science and Engineering Center, Japan Atomic Energy Agency
  • Zhang, Ruopeng
    Department of Materials Science and Engineering, University of California, Berkeley; National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley
  • 井上, 耕治
    Institute for Materials Research, Tohoku University
  • Gao, Wenqiang
    Key Laboratory of Advanced Materials (MoE), School of Materials Science and Engineering, Tsinghua University
  • Godfrey, Andy
    Key Laboratory of Advanced Materials (MoE), School of Materials Science and Engineering, Tsinghua University
  • 光原, 昌寿
    Department of Advanced Materials Science and Engineering, Kyushu University
  • Morris, J. W.
    Department of Materials Science and Engineering, University of California, Berkeley
  • Minor, Andrew M.
    Department of Materials Science and Engineering, University of California, Berkeley; National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley
  • 辻, 伸泰
    Department of Materials Science and Engineering, Kyoto University; Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University
  • 崇, 巌
  • 都留, 智仁
  • 井上, 耕治
  • 光原, 昌寿
  • 辻, 伸泰

説明

Interstitial oxygen embrittles titanium, particularly at cryogenic temperatures, which necessitates a stringent control of oxygen content in fabricating titanium and its alloys. Here, we propose a structural strategy, via grain refinement, to alleviate this problem. Compared to a coarse-grained counterpart that is extremely brittle at 77 K, the uniform elongation of an ultrafine-grained (UFG) microstructure (grain size ~ 2.0 µm) in Ti-0.3wt.%O is successfully increased by an order of magnitude, maintaining an ultrahigh yield strength inherent to the UFG microstructure. This unique strength-ductility synergy in UFG Ti-0.3wt.%O is achieved via the combined effects of diluted grain boundary segregation of oxygen that helps to improve the grain boundary cohesive energy and enhanced <c + a> dislocation activities that contribute to the excellent strain hardening ability. The present strategy will not only boost the potential applications of high strength Ti-O alloys at low temperatures, but can also be applied to other alloy systems, where interstitial solution hardening results into an undesirable loss of ductility.

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