Accession Number : AD0800056

Title :   DEVELOPMENT OF ALUMINUM BASE ALLOYS-SECTION I.

Descriptive Note : Final rept. 29 Sep 61-30 Sep 65,

Corporate Author : ALUMINUM CO OF AMERICA ALCOA CENTER PA ALCOA LABS

Personal Author(s) : Lyle, J. P., Jr

Report Date : 07 SEP 1966

Pagination or Media Count : 33

Abstract : It is possible to fabricate high quality, high strength hot-worked products of heat treatable aluminum alloys from prealloyed atomized powders. Preliminary and limited testing indicates that extrusions made this way with appropriate heat treatments have the following combination of properties: (1) Tensile and yield strengths 12-36% higher than conventional 7075-T73 combined with resistance to stress corrosion cracking (SCC) equal to 7075-T73, (2) Tensile and yield strengths 11-25% higher than conventional 7178-T6 combined with resistance to SCC equal resistance to SCC equal to 7178-T6, (3) Tensile and yield strengths equal to conventional 7178-T6, combined with better resistance to SCC than 7178-T6, (4) Tensile strengths of 125,000 psi and yield strength: Density ratios of 1.16 million inches, (5) High resistance to exfoliation, (6) Tensile and yield strengths higher than X2020-T6 from -112 to at least 212 F and higher than 7075-T6 from -112 to at least 400 F, (7) Fatigue strengths (smooth and notched specimens) at least as high as 7075-76, (8) Toughness in strongest tempers inferior to 7075-T6 and 7178-T6, but toughness may be made competitive by more extensive aging, and (9) Poor fusion weldability (low strength and ductility) due to porosity.

Descriptors :   *POWDER METALLURGY), (*ALUMINUM ALLOYS, EXTRUSION, TENSILE PROPERTIES, STRESS CORROSION, FRACTURE(MECHANICS), TOUGHNESS, FATIGUE(MECHANICS), AGING(MATERIALS), POROSITY, DUCTILITY, WELDABILITY, FORGING, ROLLING(METALLURGY).

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE