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High-velocity projectile impact induced 9R phase in ultrafine-grained aluminium

Author

Listed:
  • Sichuang Xue

    (Purdue University)

  • Zhe Fan

    (Purdue University)

  • Olawale B. Lawal

    (Rice University)

  • Ramathasan Thevamaran

    (Rice University
    University of Wisconsin-Madison)

  • Qiang Li

    (Purdue University)

  • Yue Liu

    (Shanghai Jiao Tong Univeristy)

  • K. Y. Yu

    (China University of Petroleum)

  • Jian Wang

    (University of Nebraska-Lincoln)

  • Edwin L. Thomas

    (Rice University)

  • Haiyan Wang

    (Purdue University)

  • Xinghang Zhang

    (Purdue University)

Abstract

Aluminium typically deforms via full dislocations due to its high stacking fault energy. Twinning in aluminium, although difficult, may occur at low temperature and high strain rate. However, the 9R phase rarely occurs in aluminium simply because of its giant stacking fault energy. Here, by using a laser-induced projectile impact testing technique, we discover a deformation-induced 9R phase with tens of nm in width in ultrafine-grained aluminium with an average grain size of 140 nm, as confirmed by extensive post-impact microscopy analyses. The stability of the 9R phase is related to the existence of sessile Frank loops. Molecular dynamics simulations reveal the formation mechanisms of the 9R phase in aluminium. This study sheds lights on a deformation mechanism in metals with high stacking fault energies.

Suggested Citation

  • Sichuang Xue & Zhe Fan & Olawale B. Lawal & Ramathasan Thevamaran & Qiang Li & Yue Liu & K. Y. Yu & Jian Wang & Edwin L. Thomas & Haiyan Wang & Xinghang Zhang, 2017. "High-velocity projectile impact induced 9R phase in ultrafine-grained aluminium," Nature Communications, Nature, vol. 8(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01729-4
    DOI: 10.1038/s41467-017-01729-4
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