TY - JOUR
T1 - Stress breaks universal aging behavior in a metallic glass
AU - Das, Amlan
AU - Derlet, Peter M.
AU - Liu, Chaoyang
AU - Dufresne, Eric M.
AU - Maaß, Robert
N1 - Funding Information:
This research was carried out in part at the Frederick Seitz Materials Research Laboratories Central Research Facilities, University of Illinois. The authors thank A. Sandy for providing the data analysis package. The XPCS experiments were performed at the X-ray Science Division beamline 8ID-E of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. A. Beaudoin is gratefully acknowledged for providing the four-point bending setup. A.D. thanks D. Chatterjee and A. Fluerasu, and P.M.D. thanks S.H. Skjaervoe for insightful discussions. R.M. also thanks V. Giordano for bringing ref. 29 to his attention. R.M. gratefully acknowledges startup funds provided by the Department of Materials Science and Engineering at UIUC.
Publisher Copyright:
© 2019, The Author(s).
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Numerous disordered materials display a monotonous slowing down in their internal dynamics with age. In the case of metallic glasses, this general behavior across different temperatures and alloys has been used to establish an empirical universal superposition principle of time, waiting time, and temperature. Here we demonstrate that the application of a mechanical stress within the elastic regime breaks this universality. Using in-situ x-ray photon correlation spectroscopy (XPCS) experiments, we show that strong fluctuations between slow and fast structural dynamics exist, and that these generally exhibit larger relaxation times than in the unstressed case. On average, relaxation times increase with stress magnitude, and even preloading times of several days do not exhaust the structural dynamics under load. A model Lennard-Jones glass under shear deformation replicates many of the features revealed with XPCS, indicating that local and heterogeneous microplastic events can cause the strongly non-monotonous spectrum of relaxation times.
AB - Numerous disordered materials display a monotonous slowing down in their internal dynamics with age. In the case of metallic glasses, this general behavior across different temperatures and alloys has been used to establish an empirical universal superposition principle of time, waiting time, and temperature. Here we demonstrate that the application of a mechanical stress within the elastic regime breaks this universality. Using in-situ x-ray photon correlation spectroscopy (XPCS) experiments, we show that strong fluctuations between slow and fast structural dynamics exist, and that these generally exhibit larger relaxation times than in the unstressed case. On average, relaxation times increase with stress magnitude, and even preloading times of several days do not exhaust the structural dynamics under load. A model Lennard-Jones glass under shear deformation replicates many of the features revealed with XPCS, indicating that local and heterogeneous microplastic events can cause the strongly non-monotonous spectrum of relaxation times.
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U2 - 10.1038/s41467-019-12892-1
DO - 10.1038/s41467-019-12892-1
M3 - Article
C2 - 31676748
AN - SCOPUS:85074323182
SN - 2041-1723
VL - 10
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 5006
ER -