Program to Improve the Fracture Toughness and Fatigue Resistance of Aluminum Sheet and Plate for Aircraft Applications.
Final rept. Dec 71-Jul 73,
REYNOLDS METALS CO RICHMOND VA METALLURGICAL RESEARCH DIV
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A variety of thermomechanical processing practices have been investigated in 2000 and 7000 series alloys. These have been of the form solution heat treat, quench, preage, work harden and final age. In Task I the effects of Cu 1.9 and 1.3 and Mg 2.5 and 1.7 content of 7000 series alloys were evaluated together with the preage and thermomechanical working conditions. It was found that the highest properties were obtained with the lower Cu and Mg contents, with an overaged preage followed by a warm rolling operation. These findings were incorporated in Task II in the choice of alloy RX725 6 Zn, 2.4 Mg, 1.5 Cu, and .12 Zr and by concentrating an overaged, warm rolled processing conditions. It was found that the goals of the contract would be achieved however, some unexplained low toughness values were obtained. Modified author abstract
- Metallurgy and Metallography