Accession Number : AD0670979

Title :   DEVELOPMENT OF HIGH STRENGTH WROUGHT ALUMINUM BASE ALLOYS.

Descriptive Note : Rept. for Jun 66-Jun 67,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE CASTING AND SOLIDIFICATION SECTION

Personal Author(s) : Singh,S. N. ; Bower,T. F. ; Flemings,M. C.

Report Date : JUN 1967

Pagination or Media Count : 126

Abstract : Work is reported on small-scale laboratory techniques for development of high strength wrought aluminum alloys, and on structure and properties of alloys produced. Highest tensile strengths obtained were in excess of 115,000 psi; highest yield strengths were in excess of 110,000 psi. Four different alloys tested showed yield strengths in excess of 90,000 psi with elongations in excess of 5%. All testing was on flat specimens machined from rolled sheet. The sheet was produced from cast ingots. The ingots employed as starting material were thin section rapidly solidified plates. The rapid solidification produced a dendrite arm spacing that was sufficiently fine (approximately 8 microns) that complete homogenization was feasible in a reasonable time. Plates were fully homogenized before rolling. In initial stages of the alloy development, a levitation melting and 'splat cooling' device was used to permit rapid determination of (1) maximum alloy contents that could be employed while still retaining a single phase at solution temperature, and (2) optimum solution treatment temperature. Dendrite arm spacing in these splats was 1-2 microns. (Author)

Descriptors :   (*ALUMINUM ALLOYS, PREPARATION), TENSILE PROPERTIES, HEAT TREATMENT, AGING(MATERIALS), CASTING, HARDNESS, COLD WORKING, MAGNESIUM ALLOYS, ZINC ALLOYS, COPPER ALLOYS, GRAIN STRUCTURES(METALLURGY), HEAT RESISTANT ALLOYS, HEAT RESISTANT METALS, MECHANICAL PROPERTIES, FLEXURAL STRENGTH, EXTRUSION, SHEETS

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE