Actions for Hydrogenated vacancies lock dislocations in aluminium [electronic resource].

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Hydrogenated vacancies lock dislocations in aluminium [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 13,341 : digital, PDF file
Additional Creators
Johns Hopkins University, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Due to its high diffusivity, hydrogen is often considered a weak inhibitor or even a promoter of dislocation movements in metals and alloys. By quantitative mechanical tests in an environmental transmission electron microscope, here we demonstrate that after exposing aluminium to hydrogen, mobile dislocations can lose mobility, with activating stress more than doubled. On degassing, the locked dislocations can be reactivated under cyclic loading to move in a stick-slip manner. However, relocking the dislocations thereafter requires a surprisingly long waiting time of ~103 s, much longer than that expected from hydrogen interstitial diffusion. Both the observed slow relocking and strong locking strength can be attributed to superabundant hydrogenated vacancies, verified by our atomistic calculations. In conclusion, vacancies therefore could be a key plastic flow localization agent as well as damage agent in hydrogen environment.
Report Numbers
E 1.99:1361696
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Note
Published through SciTech Connect.
11/03/2016.
"ncomms13341"
Nature Communications 7 ISSN 2041-1723 AM
Degang Xie; Suzhi Li; Meng Li; Zhangjie Wang; Peter Gumbsch; Jun Sun; Evan Ma; Ju Li; Zhiwei Shan.
Funding Information
FG02-03ER46056
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