Accession Number:

ADA025165

Title:

Effect of Iron and Silicon Content on Stress Corrosion Cracking in a Thermomechanically Processed Aluminum Alloy.

Descriptive Note:

Final technical rept. Aug 74-Aug 75,

Corporate Author:

AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1976-03-01

Pagination or Media Count:

42.0

Abstract:

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

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE