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Title: Hydrogenated vacancies lock dislocations in aluminium

Abstract

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 ~10 3 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.

Authors:
 [1];  [2];  [1];  [1];  [3];  [1];  [4]; ORCiD logo [5];  [1]
  1. Xi'an Jiaotong Univ., Xi'an (China)
  2. Karlsruhe Inst. of Technology (KIT), Karlsruhe (Germany)
  3. Karlsruhe Inst. of Technology (KIT), Karlsruhe (Germany); Fraunhofer-Institut fur Werkstoffmechanik IWM, Freiburg (Germany)
  4. Xi'an Jiaotong Univ., Xi'an (China); Johns Hopkins Univ., Baltimore, MD (United States)
  5. Xi'an Jiaotong Univ., Xi'an (China); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1361696
Alternate Identifier(s):
OSTI ID: 1393400
Grant/Contract Number:  
FG02-03ER46056; FG02-09ER46056
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; mechanical properties; metals and alloys; Metals; Alloys

Citation Formats

Xie, Degang, Li, Suzhi, Li, Meng, Wang, Zhangjie, Gumbsch, Peter, Sun, Jun, Ma, Evan, Li, Ju, and Shan, Zhiwei. Hydrogenated vacancies lock dislocations in aluminium. United States: N. p., 2016. Web. doi:10.1038/ncomms13341.
Xie, Degang, Li, Suzhi, Li, Meng, Wang, Zhangjie, Gumbsch, Peter, Sun, Jun, Ma, Evan, Li, Ju, & Shan, Zhiwei. Hydrogenated vacancies lock dislocations in aluminium. United States. doi:10.1038/ncomms13341.
Xie, Degang, Li, Suzhi, Li, Meng, Wang, Zhangjie, Gumbsch, Peter, Sun, Jun, Ma, Evan, Li, Ju, and Shan, Zhiwei. Thu . "Hydrogenated vacancies lock dislocations in aluminium". United States. doi:10.1038/ncomms13341. https://www.osti.gov/servlets/purl/1361696.
@article{osti_1361696,
title = {Hydrogenated vacancies lock dislocations in aluminium},
author = {Xie, Degang and Li, Suzhi and Li, Meng and Wang, Zhangjie and Gumbsch, Peter and Sun, Jun and Ma, Evan and Li, Ju and Shan, Zhiwei},
abstractNote = {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.},
doi = {10.1038/ncomms13341},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Thu Nov 03 00:00:00 EDT 2016},
month = {Thu Nov 03 00:00:00 EDT 2016}
}

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Cited by: 11 works
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Works referenced in this record:

A climbing image nudged elastic band method for finding saddle points and minimum energy paths
journal, December 2000

  • Henkelman, Graeme; Uberuaga, Blas P.; Jónsson, Hannes
  • The Journal of Chemical Physics, Vol. 113, Issue 22, p. 9901-9904
  • DOI: 10.1063/1.1329672