Uncommon Deformation Mechanisms during Fatigue-Crack Propagation in Nanocrystalline Alloys

Sheng Cheng, Soo Yeol Lee, Li Li, Changhui Lei, Jon Almer, Xun-Li Wang, Tamas Ungar, Yinmin Wang, and Peter K. Liaw
Phys. Rev. Lett. 110, 135501 – Published 25 March 2013
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Abstract

The irreversible damage at cracks during the fatigue of crystalline solids is well known. Here we report on in situ high-energy x-ray evidence of reversible fatigue behavior in a nanocrystalline NiFe alloy both in the plastic zone and around the crack tip. In the plastic zone, the deformation is fully recoverable as the crack propagates, and the plastic deformation invokes reversible interactions of dislocation and twinning in the nanograins. But around the crack tip lies a regime with reversible grain lattice reorientation promoted by a change of local stress state. These observations suggest unprecedented fatigue deformation mechanisms in nanostructured systems that are not addressed theoretically.

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  • Received 1 May 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.135501

© 2013 American Physical Society

Authors & Affiliations

Sheng Cheng1,*, Soo Yeol Lee2, Li Li1, Changhui Lei3, Jon Almer4, Xun-Li Wang5, Tamas Ungar6, Yinmin Wang7,†, and Peter K. Liaw1

  • 1Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 2Department of Materials Science and Engineering, Chungnam National University, Daejeon 305-764, South Korea
  • 3Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801, USA
  • 4X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
  • 6Department of Materials Physics, Eötvös University, Budapest H-1518 POB, Hungary
  • 7Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA

  • *scheng.msg@gmail.com
  • ymwang@llnl.gov

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Vol. 110, Iss. 13 — 29 March 2013

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