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Title: In-situ transmission electron microscopic observation of corrosion-enhanced dislocation emission and crack initiation of stress corrosion

Abstract

A constant deflection device designed for use within a transmission electron microscope (TEM) was used to study the change in dislocation configuration ahead of a crack tip during stress corrosion cracking (SCC) of brass in water, Ti-24% Al-11% Nb alloy in methanol (CH{sub 3}OH), and the initiation of SCC. In-situ tensile tests in the TEM also were carried out to assess deformation without the influence of environment. Results showed that corrosion during SCC enhanced dislocation emission, multiplication, and motion as well as produced a dislocation-free zone (DFZ). Nanocracks of SCC initiated in the DFZ or from the crack tip when the corrosion-enhanced dislocation emission and motion reached a certain condition. The action of the corrosion process prompted nanocrack propagation into a cleavage or intergranular microcrack rather than blunting into a void as seen during experiments in the TEM.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Univ. of Science and Technology Beijing (CN)
OSTI Identifier:
20075970
Resource Type:
Journal Article
Journal Name:
Corrosion (Houston)
Additional Journal Information:
Journal Volume: 56; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0010-9312
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; STRESS CORROSION; FRACTURE PROPERTIES; BRASS; TITANIUM ALLOYS; ALUMINIUM ALLOYS; NIOBIUM ALLOYS; CRACK PROPAGATION; DISLOCATIONS; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Gao, K.W., Chu, W.Y., Gu, B., Zhang, T.C., and Qiao, L.J. In-situ transmission electron microscopic observation of corrosion-enhanced dislocation emission and crack initiation of stress corrosion. United States: N. p., 2000. Web. doi:10.5006/1.3280556.
Gao, K.W., Chu, W.Y., Gu, B., Zhang, T.C., & Qiao, L.J. In-situ transmission electron microscopic observation of corrosion-enhanced dislocation emission and crack initiation of stress corrosion. United States. doi:10.5006/1.3280556.
Gao, K.W., Chu, W.Y., Gu, B., Zhang, T.C., and Qiao, L.J. Mon . "In-situ transmission electron microscopic observation of corrosion-enhanced dislocation emission and crack initiation of stress corrosion". United States. doi:10.5006/1.3280556.
@article{osti_20075970,
title = {In-situ transmission electron microscopic observation of corrosion-enhanced dislocation emission and crack initiation of stress corrosion},
author = {Gao, K.W. and Chu, W.Y. and Gu, B. and Zhang, T.C. and Qiao, L.J.},
abstractNote = {A constant deflection device designed for use within a transmission electron microscope (TEM) was used to study the change in dislocation configuration ahead of a crack tip during stress corrosion cracking (SCC) of brass in water, Ti-24% Al-11% Nb alloy in methanol (CH{sub 3}OH), and the initiation of SCC. In-situ tensile tests in the TEM also were carried out to assess deformation without the influence of environment. Results showed that corrosion during SCC enhanced dislocation emission, multiplication, and motion as well as produced a dislocation-free zone (DFZ). Nanocracks of SCC initiated in the DFZ or from the crack tip when the corrosion-enhanced dislocation emission and motion reached a certain condition. The action of the corrosion process prompted nanocrack propagation into a cleavage or intergranular microcrack rather than blunting into a void as seen during experiments in the TEM.},
doi = {10.5006/1.3280556},
journal = {Corrosion (Houston)},
issn = {0010-9312},
number = 5,
volume = 56,
place = {United States},
year = {2000},
month = {5}
}