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Title: Influence of loading control on strain bursts and dislocation avalanches at the nanometer and micrometer scale

Journal Article · · Physical Review B
 [1];  [1];  [1]
  1. Univ. of California, Los Angeles, CA (United States)

Through three-dimensional discrete dislocation dynamics simulations, we show that by tuning the mode of external loading, the collective dynamics of dislocations undergo a transition from driven avalanches under stress control to quasiperiodic oscillations under strain control. We directly correlate measured intermittent plastic events with internal dislocation activities and collective dynamics. Under different loading modes, the roles of the weakest dislocation source and the defect population trend are significantly different. This finding raises new possibilities of controlling correlated dislocation activities and obtaining a low defect density in nanostructured devices by tuning external constraints. In addition, the effect of machine stiffness comes to light. The statistical analysis of the burst magnitude is revisited and carefully discussed. Self-organized criticality and scale-free statistics of strain bursts are obeyed under stress control. However, this behavior is shown to break down under strain control. Rapid stress drops under pure strain control force truncation of dislocation avalanches, leading to a dynamical transition to quasiperiodic oscillations.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-03ER54708
OSTI ID:
1535849
Alternate ID(s):
OSTI ID: 1343336
Journal Information:
Physical Review B, Vol. 95, Issue 6; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (3)

Effects of precipitates and dislocation loops on the yield stress of irradiated iron journal May 2018
Concurrent atomistic-continuum simulations of uniaxial compression of gold nano/submicropillars journal May 2018
Avalanches and Plastic Flow in Crystal Plasticity: An Overview text January 2017