Investigation to Improve the Stress Corrosion Resistance of Aluminum Aircraft Alloys Through Alloy Additions and Specialized Heat Treatment

摘要

The objective of this program was to develop a high-strength aluminum alloy resistant to stress-corrosion cracking in the short-transverse direction. The alloys investigated included a 7075 control, 7075 type alloys which contained either 0.3% Mn or 0.1% Zr in place of 0.2% Cr, similar alloys which also contained 0.3% Ag, and chromium-bearing alloys which contained either higher zinc or higher copper than the maximum amounts specified for 7075. These materials were evaluated as two-inch thick plate to insure that the structures would be representative of thick, hot-worked products. (Author)