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DEVELOPMENT OF ALUMINUM-BASE ALLOYS.
Annual progress rept. no. 2, 29 Sep 61-30 Sep 63,
ALUMINUM CO OF AMERICA PITTSBURGH PA
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A tensile strength of 127,500 psi and a yield strength of 124,400 psi were obtained in an aluminum powder metallurgy alloy extrusion by combining precipitation hardening with dispersion hardening. High temperature solution heat treatment, high quenching rate, and long aging time were rerequired to achieve these properties in an alloy containing 9.8 Zn, 4.0 Mg, .8 Cu, 1.1 Mn, 1.0 Fe, 1.3 Ni, .01 Cr, and .01 Ti. Five other alloys have achieved yield strengths of 120,000 psi or higher. The alloys all had low ductility, generally less than 1.0 for those having the higher tensile properties. Extruded sections have been hot forged with success. The forged billets have been fabricated into sheet by hot rolling only. Author
APPROVED FOR PUBLIC RELEASE