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Elimination of oxygen sensitivity in α-titanium by substitutional alloying with Al

Author

Listed:
  • Yan Chong

    (University of California
    National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory)

  • Ruopeng Zhang

    (University of California
    National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory)

  • Mohammad S. Hooshmand

    (University of California)

  • Shiteng Zhao

    (University of California
    National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory
    Beihang University)

  • Daryl C. Chrzan

    (University of California
    Materials Sciences Division, Lawrence Berkeley National Laboratory)

  • Mark Asta

    (University of California
    Materials Sciences Division, Lawrence Berkeley National Laboratory)

  • J. W. Morris

    (University of California)

  • Andrew M. Minor

    (University of California
    National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory
    Materials Sciences Division, Lawrence Berkeley National Laboratory)

Abstract

Individually, increasing the concentration of either oxygen or aluminum has a deleterious effect on the ductility of titanium alloys. For example, extremely small amounts of interstitial oxygen can severely deteriorate the tensile ductility of titanium, particularly at cryogenic temperatures. Likewise, substitutional aluminum will decrease the ductility of titanium at low-oxygen concentrations. Here, we demonstrate that, counter-intuitively, significant additions of both Al and O substantially improves both strength and ductility, with a 6-fold increase in ductility for a Ti-6Al-0.3 O alloy as compared to a Ti-0.3 O alloy. The Al and O solutes act together to increase and sustain a high strain-hardening rate by modifying the planar slip that predominates into a delocalized, three-dimensional dislocation pattern. The mechanism can be attributed to decreasing stacking fault energy by Al, modification of the “shuffle” mechanism of oxygen-dislocation interaction by the repulsive Al-O interaction in Ti, and micro-segregation of Al and O by the same cause.

Suggested Citation

  • Yan Chong & Ruopeng Zhang & Mohammad S. Hooshmand & Shiteng Zhao & Daryl C. Chrzan & Mark Asta & J. W. Morris & Andrew M. Minor, 2021. "Elimination of oxygen sensitivity in α-titanium by substitutional alloying with Al," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26374-w
    DOI: 10.1038/s41467-021-26374-w
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    References listed on IDEAS

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    1. Zhifeng Lei & Xiongjun Liu & Yuan Wu & Hui Wang & Suihe Jiang & Shudao Wang & Xidong Hui & Yidong Wu & Baptiste Gault & Paraskevas Kontis & Dierk Raabe & Lin Gu & Qinghua Zhang & Houwen Chen & Hongtao, 2018. "Enhanced strength and ductility in a high-entropy alloy via ordered oxygen complexes," Nature, Nature, vol. 563(7732), pages 546-550, November.
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    Cited by:

    1. Yan Chong & Reza Gholizadeh & Tomohito Tsuru & Ruopeng Zhang & Koji Inoue & Wenqiang Gao & Andy Godfrey & Masatoshi Mitsuhara & J. W. Morris & Andrew M. Minor & Nobuhiro Tsuji, 2023. "Grain refinement in titanium prevents low temperature oxygen embrittlement," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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