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Title: Hydrogenated vacancies lock dislocations in aluminium

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms13341· OSTI ID:1361696
 [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)

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. Vacancies therefore could be a key plastic flow localization agent as well as damage agent in hydrogen environment.

Research Organization:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-03ER46056; FG02-09ER46056
OSTI ID:
1361696
Alternate ID(s):
OSTI ID: 1393400
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 121 works
Citation information provided by
Web of Science

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Cited By (14)

Diffusion and distribution of deuterium in scandium deuteride thin films under irradiation of deuterium ion beam journal October 2017
Hydrogen embrittlement of the 7B05‐T5 aluminum alloy for high‐speed trains journal August 2019
Effects of hydrogen on the mechanical response of X80 pipeline steel subject to high strain rate tensile tests journal November 2019
Hydrogen embrittlement in metallic nanowires journal May 2019
Nano-scale imaging of the full strain tensor of specific dislocations extracted from a bulk sample text January 2019
Study on the Hydrogen Embrittlement of Aermet100 Using Hydrogen Permeation and SSRT Techniques journal June 2017
Hydrogen blistering under extreme radiation conditions journal January 2018
An Ultrasensitive and Ultraselective Hydrogen Sensor Based on Defect‐Dominated Electron Scattering in Pt Nanowire Arrays journal November 2018
Effect of hydrogen on the integrity of aluminium–oxide interface at elevated temperatures journal February 2017
The Effect of Hydrogen on Pore Formation in Aluminum Alloy Castings: Myth Versus Reality journal March 2020
The Myth of Hydrogen Pores in Aluminum Castings book January 2019
Self-Gathering Effect of the Hydrogen Diffusion in Welding Induced by the Solid-State Phase Transformation journal September 2019
Insights into fundamental deformation processes from advanced in situ transmission electron microscopy journal June 2019
Advanced microelectromechanical systems-based nanomechanical testing: Beyond stress and strain measurements journal June 2019

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