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Title: Transmission electron microscopic observations of embrittlement of an aluminum alloy by liquid metal

Abstract

Change in dislocation configuration ahead of a loaded crack tip of Al alloy 7075 (UNS A97075) before and after adsorbing Hg-3at% Ga atoms, and initiation of liquid-metal-induced microcracking have been observed in a transmission electron microscope (TEM) using a special TEM constant-deflection device with precracked foil. Results showed that chemisorption of liquid metal atoms can facilitate dislocation emission multiplication and motion. A microcrack initiated in the dislocation free zone or at the crack tip and propagated by a cleavage made when the chemisorption-facilitated local plasticity developed to a critical level.

Authors:
; ; ;  [1]
  1. Univ. of Science and Technology, Beijing (China). Dept. of Materials Physics
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
684442
Resource Type:
Journal Article
Journal Name:
Corrosion
Additional Journal Information:
Journal Volume: 55; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; EMBRITTLEMENT; ALUMINIUM BASE ALLOYS; LIQUID METALS; MERCURY; GALLIUM; CRACKS; CRACK PROPAGATION; DISLOCATIONS; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Liu, X.M., Su, Y.J., Qiao, L.J., and Chu, W.Y. Transmission electron microscopic observations of embrittlement of an aluminum alloy by liquid metal. United States: N. p., 1999. Web. doi:10.5006/1.3284041.
Liu, X.M., Su, Y.J., Qiao, L.J., & Chu, W.Y. Transmission electron microscopic observations of embrittlement of an aluminum alloy by liquid metal. United States. doi:10.5006/1.3284041.
Liu, X.M., Su, Y.J., Qiao, L.J., and Chu, W.Y. Wed . "Transmission electron microscopic observations of embrittlement of an aluminum alloy by liquid metal". United States. doi:10.5006/1.3284041.
@article{osti_684442,
title = {Transmission electron microscopic observations of embrittlement of an aluminum alloy by liquid metal},
author = {Liu, X.M. and Su, Y.J. and Qiao, L.J. and Chu, W.Y.},
abstractNote = {Change in dislocation configuration ahead of a loaded crack tip of Al alloy 7075 (UNS A97075) before and after adsorbing Hg-3at% Ga atoms, and initiation of liquid-metal-induced microcracking have been observed in a transmission electron microscope (TEM) using a special TEM constant-deflection device with precracked foil. Results showed that chemisorption of liquid metal atoms can facilitate dislocation emission multiplication and motion. A microcrack initiated in the dislocation free zone or at the crack tip and propagated by a cleavage made when the chemisorption-facilitated local plasticity developed to a critical level.},
doi = {10.5006/1.3284041},
journal = {Corrosion},
number = 9,
volume = 55,
place = {United States},
year = {1999},
month = {9}
}