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Metals 2012, 2(4), 529-539; doi:10.3390/met2040529

Structural Irreversibility and Enhanced Brittleness under Fatigue in Zr-Based Amorphous Solids

1,* , 3
1 Department of Physics, University of Virginia, VA 22904, USA 2 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China 3 Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37831, USA 4 Institute of Materials Research, Tohoku University, Sendai 980-8577, Japan 5 Los Alamos National Laboratory, Lujan Neutron Scattering Center, Los Alamos, NM 87545, USA 6 Materials and Structures Laboratory, Tokyo Institute of Technology, 4259-R3-8 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan 7 NIST Center for Neutron Research, Gaithersburg, MD 20899, USA and Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA 8 Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
* Author to whom correspondence should be addressed.
Received: 16 August 2012 / Revised: 9 November 2012 / Accepted: 11 December 2012 / Published: 19 December 2012
(This article belongs to the Special Issue Amorphous Alloys)
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The effect of fatigue on ZrCuAl amorphous metals induced by mechanical cyclic loading is investigated using inelastic neutron scattering and the pair density function analysis of neutron diffraction data. With cooling, the local atomic structure undergoes reorganization under fatigue that is directly related to the number of fatigue cycles. Also under fatigue, suppression in the atomic dynamics is observed as well. A structural restructuring occurs within a 4 Å radius and intensifies with increasing the compression cycles, whereas the vibrational density of states is attenuated as the intensity shifts towards the elastic, zero-energy transfer peak. The combined static and dynamic structural effects are a signature of the microscopic changes brought about by fatigue, and together may be the onset for subsequent behaviors following extended cyclic loading such as fracture. Even after the load is removed, the structural changes described here remain and increase with repeated cyclic loading which is an indication that the lattice deforms even before shear bands are formed.
Keywords: local structure; compression fatigue; dynamics; VDOS attenuation local structure; compression fatigue; dynamics; VDOS attenuation
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Tong, P.; Louca, D.; Wang, G.; Liaw, P.K.; Yokoyama, Y.; Llobet, A.; Kawaji, H.; Qiu, Y.; Shi, Y. Structural Irreversibility and Enhanced Brittleness under Fatigue in Zr-Based Amorphous Solids. Metals 2012, 2, 529-539.

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