Stress-Corrosion Cracking of Aluminum Alloy 7079-T6 in Seawater
Stress-Corrosion Cracking of Aluminum Alloy 7079-T6 in Seawater

Author: H. P. Chu

Publisher:

Published: 1969

Total Pages: 24

ISBN-13:

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The resistance of a 7079-T6 aluminum alloy to stress-corrosion cracking in seawater was examined by testing precracked cantilever beams fabricated of the alloy. Specimens tested in the direction of rolling were found to have gained substantially in notch strength after long-time exposure to the stress-corrosion cracking condition. The results are compared with those obtained by a conventional test method. (Author).

Stress-corrosion Studies of Aluminum Alloy 7079-t6 in Seawater
Stress-corrosion Studies of Aluminum Alloy 7079-t6 in Seawater

Author: George A. Wacker

Publisher:

Published: 1966

Total Pages: 22

ISBN-13:

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The stress-corrosion susceptibility of Aluminum Alloy 7079 in the T6 temper was investigated as a function of longitudinal, long-transverse, and short-transverse plate orientations. The alloy was found to be susceptible to stress-corrosion and pitting attack. Specimens oriented in the short transverse direction had the lowest resistance to damage in seawater. Variations in orientation-dependent stress-corrosion cracking susceptibility were related to microstructural characteristics. The alloy is considered unsuitable for naval applications under conditions conducive to stress corrosion. (Author).

Effects of Electrochemical Potential on Stress Corrosion Cracking of Aluminum Alloy 7079-T6 in Salt Water
Effects of Electrochemical Potential on Stress Corrosion Cracking of Aluminum Alloy 7079-T6 in Salt Water

Author: M. H. Peterson

Publisher:

Published: 1962

Total Pages: 15

ISBN-13:

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Cathodic protection schemes can greatly extend the useful life of the high strength aluminum alloy 7079, but because of general cathodic wastage at high cathodic currents, cathodic protection cannot produce indefinite immunity to stress corrosion cracking. For long-term applications in sea water requiring this alloy a high-integrity paint system backed up with a galvanic anode system would be indicated for maximum reliability. (Author).

Stress Corrosion Testing of 7079-T6 Aluminum Alloy in Various Environments
Stress Corrosion Testing of 7079-T6 Aluminum Alloy in Various Environments

Author: B. W. Lifka

Publisher:

Published: 1967

Total Pages: 21

ISBN-13:

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Stress corrosion cracking of certain 7079-T6 aluminum alloy aircraft structures involving sustained tensile stress acting in an unfavorable grain direction has occurred sometimes in surprisingly mild environments. The resistance of short-transverse specimens of 7079-T6 products has been evaluated at different levels of applied stress in several different seacoast and inland industrial atmospheres. It was found that the atmosphere was more critical than the generally accepted alternate-immersion test using 3.5 per cent sodium chloride. The results of the outdoor tests are correlated with eight accelerated exposures; and consideration is given to the most suitable laboratory stress corrosion test environment for this alloy. A detailed analysis of the constant deformation methods of stressing is included.

A Fundamental Investigation of the Nature of Stress-corrosion Cracking in Aluminum Alloys
A Fundamental Investigation of the Nature of Stress-corrosion Cracking in Aluminum Alloys

Author: F. H. Haynie

Publisher:

Published: 1965

Total Pages: 76

ISBN-13:

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The mechanism of stress-corrosion cracking in 7079 aluminum alloy was investigated by analysis of microstructural changes that occur during exposure to 3.5 per cent NaCl solution. During the corrosion reaction dislocation networks were generated within the grains and along strain-contour bands. Grain-boundary voids occurred where several of these bands originated or terminated. This suggests that the intragranular structure develops as a result of hydrogen entering the alloy and that the voids are propagated under applied load to form grain-boundary cracks. This study is in the preliminary stages and is being continued. (Author).