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Macrodeformation Twins in Single-Crystal Aluminum

F. Zhao, L. Wang, D. Fan, B. X. Bie, X. M. Zhou, T. Suo, Y. L. Li, M. W. Chen, C. L. Liu, M. L. Qi, M. H. Zhu, and S. N. Luo
Phys. Rev. Lett. 116, 075501 – Published 17 February 2016
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Abstract

Deformation twinning in pure aluminum has been considered to be a unique property of nanostructured aluminum. A lingering mystery is whether deformation twinning occurs in coarse-grained or single-crystal aluminum at scales beyond nanotwins. Here, we present the first experimental demonstration of macrodeformation twins in single-crystal aluminum formed under an ultrahigh strain rate (106s1) and large shear strain (200%) via dynamic equal channel angular pressing. Large-scale molecular dynamics simulations suggest that the frustration of subsonic dislocation motion leads to transonic deformation twinning. Deformation twinning is rooted in the rate dependences of dislocation motion and twinning, which are coupled, complementary processes during severe plastic deformation under ultrahigh strain rates.

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  • Received 15 October 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.075501

© 2016 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Condensed Matter, Materials & Applied Physics

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Unexpected Twins

Published 17 February 2016

Aluminum crystals can respond to strain by twinning—a finding that challenges conventional conceptions of material deformation.

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Authors & Affiliations

F. Zhao1,2, L. Wang1, D. Fan1, B. X. Bie1,3, X. M. Zhou1, T. Suo4, Y. L. Li4, M. W. Chen5,6, C. L. Liu7, M. L. Qi3, M. H. Zhu2,*, and S. N. Luo1,2,†

  • 1The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People’s Republic of China
  • 2Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, People’s Republic of China
  • 3School of Science, Wuhan Univiersity of Technology, Wuhan, Hubei 430070, People’s Republic of China
  • 4School of Aeronautics, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, People’s Republic of China
  • 5WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 6State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, People’s Republic of China
  • 7Institute of Fluid Physics, Mianyang, Sichuan 621900, People’s Republic of China

  • *zhuminhao@swjtu.cn
  • sluo@pims.ac.cn

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Vol. 116, Iss. 7 — 19 February 2016

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