Optimizing the Combination of Strength and Stress-Corrosion Resistance of 7075 Aluminum by Thermal-Mechanical Treatments
Final rept. 1 Apr 1969-31 Mar 1970
ROCKETDYNE CANOGA PARK CA
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Yield strengths exceeding 70,000 psi, coupled with stress-corrosion times-to-failure in excess of 30 days at applied stresses of 75 of yield, were obtained by a two-step overagingpress forging operation. These properties were achieved in the center of blocks that were 3 to 4 inches thick before reductions of 10 to 20. Longitudinal reductions were found to produce improvements in short transverse yield strength varying from 10,500 to 13,400 psi. Such results typified the strong dependence of mechanical properties on working direction noted in this study. Exploratory heat treatments incorporating several departures from standard practice gave encouraging results in another phase of the program.
- Fabrication Metallurgy