Effect of Iron and Silicon Content on Stress Corrosion Cracking in a Thermomechanically Processed Aluminum Alloy.
Final technical rept. Aug 74-Aug 75,
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
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A study of stress corrosion cracking in 7475 type aluminum alloy plates was conducted using five iron and silicon levels, chromium and zirconium minor additions, and two tempers T651 and thermomechanical processing TMP. The T651 specimens showed no clear effects of purity or minor addition on stress corrosion resistance however, a large purity effect was seen in TMP specimens. As total iron and silicon content decreased from 0.31 to 0.02 weight percent, the 2000-hour threshold stress intensity about doubled in these alloys. In addition, TMP alloys showed a relationship between stress corrosion, threshold stress intensity, and precracked Charpy toughness. Author
- Properties of Metals and Alloys